JavaScript/CSS/HTML || Modal.js – Simple Modal Popup Panel Using Vanilla JavaScript

September 04, 2020 admin No comments

The following is a module which allows for a simple modal popup panel in vanilla JavaScript. Options include allowing the modal to be dragged, resized, and closed on outer area click.

Modal drag and resize supports touch (mobile) input.

Modal.js & CSS Source

Contents

1. Basic Usage 2. Modal HTML 3. Initialize Modal Options 4. Modal Dialog 5. Modal.js & CSS Source 6. More Examples

1. Basic Usage

Syntax is very straightforward. The following demonstrates showing and hiding a modal popup.





		
		
			1. Basic Usage
			
JavaScript
			
			// Opening & Closing Modal. 

<script>
(() => {
    // Shows the modal popup. It accepts either a string selector
    // or a Javascript element
    Modal.show('selector');
    
    // Hides the modal popup. It accepts either a string selector
    // or a Javascript element    
    Modal.hide(document.querySelector('selector'));
})();
</script>
			
				
					
				
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						// Opening & Closing Modal. 
 
<script>
(() => {
    // Shows the modal popup. It accepts either a string selector
    // or a Javascript element
    Modal.show('selector');
    
    // Hides the modal popup. It accepts either a string selector
    // or a Javascript element    
    Modal.hide(document.querySelector('selector'));
})();
</script>

‘Modal.show‘ and ‘Modal.hide‘ accepts either a string selector or a Javascript element.

2. Modal HTML

The following is the HTML used to display the modal. The attributes supplied to the ‘modal’ element specifies whether it is allowed to be dragged, resized, or closed on outer area click.





		
		
			2. Modal HTML
			
XHTML
			
			<!-- // Available options -->

<!-- The Modal Background-->
<section id="modalExample" class="modal"
        data-closeOnOuterClick="true"
        data-draggable="true"
        data-resizable="true"
    >
    <!-- Modal Panel -->
    <article class="modal-panel">
        <header class="modal-header">
            <div class="modal-header-text">
                Modal Header
            </div>
            <div class="modal-close-button"></div>
        </header>
        <div class="modal-body">
            <p>Some text in the Modal Body</p>
            <p>Some other text...</p>
        </div>
        <footer class="modal-footer">
            <div class="modal-footer-text">
                Modal Footer
            </div>
        </footer>
    </article>
</section>
			
				
					
				
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						<!-- // Available options -->
 
<!-- The Modal Background-->
<section id="modalExample" class="modal"
        data-closeOnOuterClick="true"
        data-draggable="true"
        data-resizable="true"
    >
    <!-- Modal Panel -->
    <article class="modal-panel">
        <header class="modal-header">
            <div class="modal-header-text">
                Modal Header
            </div>
            <div class="modal-close-button"></div>
        </header>
        <div class="modal-body">
            <p>Some text in the Modal Body</p>
            <p>Some other text...</p>
        </div>
        <footer class="modal-footer">
            <div class="modal-footer-text">
                Modal Footer
            </div>
        </footer>
    </article>
</section>

Sample:

3. Initialize Modal Options

In order for the options on the modal to take effect, it needs to be initialized.

The following example demonstrates initializing the modal popup options.





		
		
			3. Initialize Modal Options
			
JavaScript
			
			// Initialize options. 

<script>
document.addEventListener("DOMContentLoaded", function(eventLoaded) {
    // Sets up the modal option button clicks
    Modal.init();
});
</script>
			
				
					
				
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						// Initialize options. 
 
<script>
document.addEventListener("DOMContentLoaded", function(eventLoaded) {
    // Sets up the modal option button clicks
    Modal.init();
});
</script>

Note: ‘Modal.init‘ only needs to be called once. It will initialize all modals on the page.

4. Modal Dialog

The following demonstrates adding a simple dialog to the page.

For more options, click here!





		
		
			4. Modal Dialog
			
JavaScript
			
			// Add simple dialog. 

<script>
(() => {
    // Adds a simple dialog to the page
    Modal.showDialog({
        title: 'Save Content?',
        body: 'Content will be saved. Continue?',
    });
})();
</script>
			
				
					
				
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						// Add simple dialog. 
 
<script>
(() => {
    // Adds a simple dialog to the page
    Modal.showDialog({
        title: 'Save Content?',
        body: 'Content will be saved. Continue?',
    });
})();
</script>

Sample:

5. Modal.js & CSS Source

The following is the Modal.js Namespace & CSS Source. Include this in your project to start using!





		
		
			Modal.js Namespace
			
JavaScript
			
			// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Modal.js
//    Description: Javascript that handles modal popup related functions
//    Example:
//        // Show Modal
//        Modal.show('selector')
//
//        // Hide Modal
//        Modal.hide('selector')
// ============================================================================
/**
* NAMESPACE: Modal
* USE: Handles Modal related functions
*/
var Modal = Modal || {};
(function(namespace) {
    'use strict';

// -- Public data --
    // Property to hold public variables and functions
    let exposed = namespace;

    // Set class names and other shared data
    const settings = {
        handleTypeResize: 'resize',
        handleTypeDrag: 'drag',

        // Element class names
        classNameModal: '.modal',
        classNameModalPanel: '.modal-panel',
        classNameCloseButton: '.modal-close-button',
        classNameModalHeader: '.modal-header',
        classNameModalHeaderText: '.modal-header-text',
        classNameModalBody: '.modal-body',
        classNameModalFooter: '.modal-footer',
        classNameModalFooterText: '.modal-footer-text',
        classNameDraggable: '.modal-draggable',
        classNameDraggableIcon: '.icon',
        classNameShow: '.show',
        classNameResizable: '.modal-resizable',
        classNameResizableIcon: '.icon',
        classNameDialog: '.dialog',
        classNameButton: '.modal-button',
        classNameButtonCancel: '.cancel',
        classNameButtonOK: '.ok',
        classNameButtonContainer: '.buttonContainer',
        classNameResizeMargin: '.resizeMargin',

        // Element data names
        dataNameCloseOnOuterClick: 'data-closeOnOuterClick',
        dataNameDraggable: 'data-draggable',
        dataNameIsDraggable: 'data-isDraggable',
        dataNameResizable: 'data-resizable',
        dataNameIsResizable: 'data-isResizable',
        cleanClassName: (str) => {
            return str ? str.trim().replace('.', '') : '';
        },
    };

    exposed.settings = settings;

    /**
    * FUNCTION: init
    * USE: Initializes the modal button clicks.
    * @param element: JavaScript element to search for modals.
    * @return: N/A.
    */
    exposed.init = (element = document) => {
        addClickEvents(element);
    }

    /**
    * FUNCTION: show
    * USE: Shows the modal popup.
    * @param element: JavaScript element/String selector of the modal to show.
    * @return: N/A.
    */
    exposed.show = (element) => {
        element = verifyElement(element);
        addClass(element, settings.classNameShow);
    }

    /**
    * FUNCTION: hide
    * USE: Hides the modal popup.
    * @param element: JavaScript element/String selector of the modal to hide.
    * @return: N/A.
    */
    exposed.hide = (element) => {
        element = verifyElement(element);
        resetPosition(element);
        removeClass(element, settings.classNameShow);
    }

    /**
    * FUNCTION: getPanel
    * USE: Returns the modal panel element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal panel element.
    */
    exposed.getPanel = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalPanel);
    }

    /**
    * FUNCTION: getHeader
    * USE: Returns the modal header element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal header element.
    */
    exposed.getHeader = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalHeader);
    }

    /**
    * FUNCTION: getHeaderText
    * USE: Returns the modal header text element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal header text element.
    */
    exposed.getHeaderText = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalHeaderText);
    }

    /**
    * FUNCTION: getBody
    * USE: Returns the modal body element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal body element.
    */
    exposed.getBody = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalBody);
    }

    /**
    * FUNCTION: getFooter
    * USE: Returns the modal footer element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal footer element.
    */
    exposed.getFooter = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalFooter);
    }

    /**
    * FUNCTION: getFooterText
    * USE: Returns the modal footer text element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal footer text element.
    */
    exposed.getFooterText = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalFooterText);
    }

    /**
    * FUNCTION: showDialog
    * USE: Shows a modal dialog box with an OK/Cancel button.
    * @param options: An object of initialization options.
    *   Its made up of the following properties:
    *   {
    *       title: The title of the dialog
    *       body: The content body of the dialog
    *       onShow(): Optional. Function that allows to do something before show.
    *          Return false to stop showing process
    *       onHide(): Optional. Function that allows to do something before hide.
    *          Return false to stop hidding process
    *       onDestroy(): Optional. Function that allows to do something before
    *          destroy. Return false to stop destroying process
    *       closeOnOuterClick: Optional. Determines if the dialog should close
    *          on outer dialog click. Default is False
    *       draggable: Optional. Determines if the dialog is draggable.
    *          Default is False
    *       resizable: Optional. Determines if the dialog is resizable.
    *          Default is False
    *       autoOpen: Optional. Determines if the dialog should auto open.
    *          Default is True
    *       draggable: Optional. Determines if the dialog is draggable.
    *          Default is False
    *       destroyOnHide: Optional. Determines if the dialog should be removed
    *          from DOM after hiding. Default is True
    *       buttons: Optional. Object allows to add custom buttons to the dialog
    *   }
    * @return: The modal dialog object.
    */
    exposed.showDialog = (options) => {
        options = verifyOptions(options);
        let dialog = createDialog(options);
        if (toBoolean(options.autoOpen)) {
            dialog.show();
        }
        return dialog;
    }

// -- Private data --
    let verifyOptions = (options) => {
        if (typeof options !== 'object') {
            let body = options;
            options = {};
            options.body = body;
        }
        return options;
    }

    let createDialog = (options) => {
        let defaultButtons = {
            cancel: {
                text: 'Cancel',
                cssClass: settings.classNameButtonCancel,
                visible: true,
            },
            ok: {
                text: 'OK',
                cssClass: settings.classNameButtonOK,
                visible: true,
            },
        };

        copyDefaults(options, defaultButtons);

        let modalButtons = options.buttons;
        let container = document.body;
        let modal = createElement('section', [settings.classNameModal, settings.classNameDialog]);
        let modalPanel = createElement('article', [settings.classNameModalPanel, settings.classNameDialog]);
        let modalHeader = createElement('header', [settings.classNameModalHeader, settings.classNameDialog]);
        let modalHeaderText = createElement('div', [settings.classNameModalHeaderText, settings.classNameDialog]);
        let modalBody = createElement('div', [settings.classNameModalBody, settings.classNameDialog]);
        let modalFooter = createElement('footer', [settings.classNameModalFooter, settings.classNameDialog]);
        let buttonContainer = createElement('div', [settings.classNameButtonContainer]);

        modal.appendChild(modalPanel);
        modalPanel.appendChild(modalHeader);
        modalHeader.appendChild(modalHeaderText);
        modalPanel.appendChild(modalBody);
        modalPanel.appendChild(modalFooter);
        modalFooter.appendChild(buttonContainer);

        let showHeaderCloseButton = true;
        let keys = Object.keys(modalButtons);
        keys.forEach((prop, index) => {
            prop = prop.toLowerCase();
            let buttonOptions = modalButtons[prop];
            if (!isNull(buttonOptions.visible) && !toBoolean(buttonOptions.visible)) {
                return false;
            }

            let text = buttonOptions.text || '';
            let cssClass = buttonOptions.cssClass || '';
            let button = createElement('button', [settings.classNameButton, settings.classNameDialog, cssClass]);
            button.innerHTML = !isNull(text) && isEmpty(text) ? '&nbsp;' : text;
            buttonContainer.appendChild(button)

            registerEvents(button, ['click'], (eventClick) => {
                if (buttonOptions.onClick) {
                    let value = buttonOptions.onClick.call(button, eventClick);
                    if (!isNull(value) && !value) {
                        return;
                    }
                }
                hide(options.destroyOnHide);
            });

            if ((index + 1) === keys.length) {
                if (toBoolean(options.resizable)) {
                    addClass(button, settings.classNameResizeMargin);
                }
            }
            showHeaderCloseButton = false;
        });

        if (showHeaderCloseButton) {
            let modalHeaderClose = createElement('div', [settings.classNameCloseButton, settings.classNameDialog]);
            modalHeader.appendChild(modalHeaderClose);
            registerEvents(modalHeaderClose, ['click'], (eventClick) => {
                hide(options.destroyOnHide);
            });
        }

        modalHeaderText.innerHTML = options.title || '';
        modalBody.innerHTML = options.body || '';

        modal.id = `modal_${randomFromTo(1271991, 7281987)}`;
        if (toBoolean(options.closeOnOuterClick)) {
            modal.setAttribute(settings.dataNameCloseOnOuterClick, options.closeOnOuterClick);
        }
        if (toBoolean(options.draggable)) {
            modal.setAttribute(settings.dataNameDraggable, options.draggable);
        }
        if (toBoolean(options.resizable)) {
            modal.setAttribute(settings.dataNameResizable, options.resizable);
        }
        container.appendChild(modal);

        options.autoOpen = !isNull(options.autoOpen) ? options.autoOpen : true;
        if (!options.autoOpen) {
            if (isNull(options.destroyOnHide)) {
                options.destroyOnHide = false;
            }
        }
        options.destroyOnHide = !isNull(options.destroyOnHide) ? options.destroyOnHide : true;

        let show = () => {
            if (options.onShow) {
                let value = options.onShow.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            setTimeout(()=> {
                exposed.show(modal);
            }, 10);
        }
        let hide = (destroyModal = false) => {
            if (options.onHide) {
                let value = options.onHide.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            exposed.hide(modal);
            if (destroyModal) {
                setTimeout(()=> {
                    destroy();
                }, 500);
            }
        }
        let destroy = () => {
            if (options.onDestroy) {
                let value = options.onDestroy.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            if (!isDestroyed()) {
                container.removeChild(modal);
            }
        }
        let isDestroyed = () => {
            return !container.contains(modal);
        }
        let isShowing = () => {
            return hasClass(modal, settings.classNameShow);
        }

        addModalClickEvents(modal);

        if (getCoords(modalFooter).position === 'absolute') {
            modalFooter.style.position = 'relative';
            let coords = getCoords(modalFooter);
            modalPanel.style['min-width'] = coords.width + 'px';
            modalBody.style['padding-bottom'] = coords.height + 'px';
            modalFooter.style.position = null;
        }

        return {
            modal: modal,
            show: () => {
                show();
            },
            hide: () => {
                hide(options.destroyOnHide);
            },
            destroy: () => {
                hide(true);
            },
            isDestroyed: () => {
                return isDestroyed();
            },
            isShowing: () => {
                return isShowing();
            }
        };
    }

    let copyDefaults = (options, defaultButtons) => {
        if (isNull(options.buttons)) {
            options.buttons = defaultButtons
            return;
        }
        for (let prop in options.buttons) {
            prop = prop.toLowerCase();
            if (!defaultButtons.hasOwnProperty(prop)) {
                continue;
            }
            options.buttons[prop] = Object.assign(defaultButtons[prop], options.buttons[prop])
        }
    }

    let createElement = (type, classes) => {
        let element = document.createElement(type);
        if (!isNull(classes)) {
            classes.forEach(item => {
               addClass(element, item);
            });
        }
        return element;
    }

    let addClickEvents = (element) => {
        // Add misc click events for the modals
        let modals = element.querySelectorAll(settings.classNameModal);
        modals.forEach((modal, index) => {
            addModalClickEvents(modal, index);
        });
    }

    let addModalClickEvents = (modal, index = 0) => {
        let registerCloseOnOuterClick = false;

        // Add button clicks for the close button
        let closeButton = modal.querySelector(settings.classNameCloseButton);
        if (!isNull(closeButton)) {
            registerEvents(closeButton, ['click'], closeButtonEvent);
        }
        // Add functionalty to make the modal draggable
        if (shouldDrag(modal) && !isDraggable(modal)) {
            // Get elements and make sure they exist
            let panel = exposed.getPanel(modal);
            if (isNull(panel)) {
                throw new TypeError(`Unable to make Modal #${index + 1} draggable. Reason: Modal has no 'Modal Panel' associated with it.`);
            }
            // If a header exists, attach a drag handle to it
            let handle = getHandle(modal, settings.handleTypeDrag);
            if (isNull(handle)) {
                let header = exposed.getHeader(modal);
                if (!isNull(header)) {
                    handle = createHandle(header, settings.handleTypeDrag);
                } else {
                    addClass(panel, settings.classNameDraggable);
                }
            }
            makeDraggable({
                element: panel,
                handle: handle,
                keepInViewPort: true,
            });
            // Mark that this modal is draggable
            setIsDraggable(modal, true)
        }

        // Add functionalty to make the modal resizable
        if (shouldResize(modal) && !isResizable(modal)) {
            // Get elements and make sure they exist
            let panel = exposed.getPanel(modal);
            if (isNull(panel)) {
                throw new TypeError(`Unable to make Modal #${index + 1} resizable. Reason: Modal has no 'Modal Panel' associated with it.`);
            }
            // If a footer exists, attach a resize handle to it
            let handle = getHandle(modal, settings.handleTypeResize);
            if (isNull(handle)) {
                let footer = exposed.getFooter(modal);
                if (!isNull(footer)) {
                    handle = createHandle(footer, settings.handleTypeResize);
                } else {
                    addClass(panel, settings.classNameResizable);
                }
            }
            makeResizable({
                element: panel,
                handle: handle,
                keepInViewPort: true,
            });
            // Mark that this modal is resizable
            setIsResizable(modal, true);
        }
        // Check to see if we need to register the close on click event
        if (!registerCloseOnOuterClick) {
            registerCloseOnOuterClick = shouldCloseOnOuterClick(modal);
        }

        // Determine if the modal should close if the outer area is clicked
        if (registerCloseOnOuterClick) {
            registerEvents(document, ['click'], backgroundHideEvent);
        }
    }

    let registerEvents = (element, eventNames, func) => {
        eventNames.forEach((eventName, index) => {
            element.removeEventListener(eventName, func);
            element.addEventListener(eventName, func);
        });
    }

    let closeButtonEvent = (event) => {
        let closeButton = event.target || event.currentTarget;
        if (isNull(closeButton)) {
            return;
        }
        let modal = closeButton.closest(settings.classNameModal);
        exposed.hide(modal);
    }

    let backgroundHideEvent = (event) => {
        let target = event.target;
        if (isNull(target)
            || !isElement(target)
            || !hasClass(target, settings.classNameModal)
            || !hasClass(target, settings.classNameShow)
            || !shouldCloseOnOuterClick(target)) {
            return;
        }
        exposed.hide(target);
    }

    let createHandle = (container, type) => {
        let handle = document.createElement('div');
        switch (type) {
            case settings.handleTypeResize:
                addClass(handle, settings.classNameResizable);
                addClass(handle, settings.classNameResizableIcon);
                break;
            case settings.handleTypeDrag:
                addClass(handle, settings.classNameDraggable);
                addClass(handle, settings.classNameDraggableIcon);
                break;
            default:
                throw new TypeError(`Unknown handle type: ${type}`);
                break;
        }
        handle.setAttribute('tabindex', 0);
        container.appendChild(handle);
        return handle;
    }

    let getHandle = (element, type)  => {
        let selector = null;
        switch (type) {
            case settings.handleTypeResize:
                selector = `${settings.classNameResizable}${settings.classNameResizableIcon}`;
                break;
            case settings.handleTypeDrag:
                selector = `${settings.classNameDraggable}${settings.classNameDraggableIcon}`;
                break;
            default:
                throw new TypeError(`Unknown handle type: ${type}`);
                break;
        }
        return element.querySelector(selector);
    }

    let makeResizable = (options) => {
        let resizable = options.element || options;
        let handle = options.handle || resizable;
        let keepInViewPort = !isNull(options.keepInViewPort) ? options.keepInViewPort : false;

        let coords = getCoords(resizable);
        let initialWidth = coords.width;
        let initialHeight = coords.height;

        let mouseDown = (event) => {
            event.stopPropagation();
            // Get the mouse down position of the element
            let coords = getCoords(resizable);
            let offsetX = event.clientX - coords.width;
            let offsetY = event.clientY - coords.height;

            let moveElement = (event) => {
                // Get the new position
                let newWidth = (event.clientX - offsetX);
                let newHeight = (event.clientY - offsetY);

                // Make sure the width/height is never less than the initial values
                newWidth = Math.max(newWidth, initialWidth);
                newHeight = Math.max(newHeight, initialHeight);

                setPosition(resizable, {width: newWidth, height: newHeight});

                if (keepInViewPort && !isInViewport(resizable)) {
                    let bounding = resizable.getBoundingClientRect();
                    let viewInfo = getViewportInfo();
                    let viewportHeight = viewInfo.height;
                    let viewportWidth = viewInfo.width;
                    if (bounding.bottom > viewportHeight) {
                        newHeight -= Math.abs(bounding.bottom - viewportHeight);
                    }
                    if (bounding.right > viewportWidth) {
                        newWidth -= Math.abs(bounding.right - viewportWidth);
                    }
                    setPosition(resizable, {width: newWidth, height: newHeight});
                }
            }
            let reset = (event) => {
                document.removeEventListener('mousemove', moveElement);
                document.removeEventListener('mouseup', reset);
            }
            document.addEventListener('mouseup', reset);
            document.addEventListener('mousemove', moveElement);
        }
        addTouchSupport(handle);
        handle.addEventListener('mousedown', mouseDown);
    }

    let makeDraggable = (options) => {
        let draggable = options.element || options;
        let handle = options.handle || draggable;
        let keepInViewPort = !isNull(options.keepInViewPort) ? options.keepInViewPort : false;

        let mouseDown = (event) => {
            // Get the mouse down position of the element
            let coords = getCoords(draggable);
            let offsetX = event.clientX - coords.left;
            let offsetY = event.clientY - coords.top;

            let moveElement = (event) => {
                // Get the new position
                let newLeft = event.clientX - offsetX;
                let newTop = event.clientY - offsetY;

                setPosition(draggable, {left: newLeft, top: newTop});

                if (keepInViewPort && !isInViewport(draggable)) {
                    let bounding = draggable.getBoundingClientRect();
                    let viewInfo = getViewportInfo();
                    let viewportHeight = viewInfo.height;
                    let viewportWidth = viewInfo.width;

                    if (bounding.left < 0) {
                        newLeft += Math.abs(bounding.left);
                    }
                    if (bounding.top < 0) {
                        newTop += Math.abs(bounding.top);
                    }
                    if (bounding.bottom > viewportHeight) {
                        newTop -= Math.abs(bounding.bottom - viewportHeight);
                    }
                    if (bounding.right > viewportWidth) {
                        newLeft -= Math.abs(bounding.right - viewportWidth);
                    }
                    setPosition(draggable, {left: newLeft, top: newTop});
                }
            }
            let reset = (event) => {
                document.removeEventListener('mousemove', moveElement);
                document.removeEventListener('mouseup', reset);
            }
            document.addEventListener('mouseup', reset);
            document.addEventListener('mousemove', moveElement);
        }
        addTouchSupport(handle);
        handle.addEventListener('mousedown', mouseDown);
    }

    // Check to make sure the element will be within our viewport boundary
    let isInViewport = (element) => {
        let bounding = element.getBoundingClientRect();
        let viewInfo = getViewportInfo();
        return (
            bounding.top >= 0
            && bounding.left >= 0
            && bounding.bottom <= viewInfo.height
            && bounding.right <= viewInfo.width
        );
    }

    let getViewportInfo = () => {
        return {
            height: Math.max(window.innerHeight || 0, document.documentElement.clientHeight || 0),
            width: Math.max(window.innerWidth || 0, document.documentElement.clientWidth || 0),
        };
    }

    let getCoords = (element) => {
        let computedStyle = window.getComputedStyle(element);
        let intProps = ['left', 'top', 'width', 'height'];
        let result = {};
        for (const prop of intProps) {
            result[prop] = parseInt(computedStyle[prop], 10) || parseInt(element.style[prop], 10) || 0;
        }
        let stringProps = ['position'];
        for (const prop of stringProps) {
            result[prop] = (computedStyle[prop] || element.style[prop]).toLowerCase();
        }
        if (result.position !== 'relative') {
            if (!result.left) {
                result.left = element.offsetLeft || 0;
            }
            if (!result.top) {
                result.top = element.offsetTop || 0;
            }
            if (!result.width) {
                result.width = element.offsetWidth || 0;
            }
            if (!result.height) {
                result.height = element.offsetHeight || 0;
            }
        }
        return result;
    }

    let addTouchSupport = (element) => {
        let events = ['touchstart', 'touchmove', 'touchend', 'touchcancel'];
        registerEvents(element, events, touchConverter);
    }

    let touchConverter = (event) => {
        // stop touch event
        event.stopPropagation();
        event.preventDefault();
        let touches = event.changedTouches;
        if (!touches || touches.length < 1) {
            return;
        }
        let first = touches[0];
        let target = first.target;
        let type = '';
        switch (event.type) {
            case 'touchstart':
                type = 'mousedown';
                break;
            case 'touchmove':
                type = 'mousemove';
                break;
            case 'touchend': case 'touchcancel':
                type = 'mouseup';
                break;
            default:
                return;
        }
        let simulatedEvent = null;
        try {
            simulatedEvent = new MouseEvent(type, {
                bubbles: true,
                cancelable: true,
                view: window,
                screenX: first.screenX,
                screenY: first.screenY,
                clientX: first.clientX,
                clientY: first.clientY,
            });
        } catch (e) {
            simulatedEvent = document.createEvent('MouseEvent');
            simulatedEvent.initMouseEvent(type, true, true, window, 1,
                                      first.screenX, first.screenY,
                                      first.clientX, first.clientY, false,
                                      false, false, false, 0 /*left*/, null);
        }
        target.dispatchEvent(simulatedEvent);
    }

    let resetPosition = (element) => {
        let panel = exposed.getPanel(element);
        if (isNull(panel)) {
            return;
        }
        setPosition(panel, {left: null, top: null, width: null, height: null});
    }

    let setPosition = (element, options) => {
        for (const prop in options) {
            if (prop in element.style) {
                let value = options[prop];
                element.style[prop] = !isNull(value) ? parseInt(value, 10) + 'px' : value;
            }
        }
    }

    let shouldCloseOnOuterClick = (element) => {
        let value = element.getAttribute(settings.dataNameCloseOnOuterClick);
        return toBoolean(value);
    }

    let shouldDrag = (element) => {
        let value = element.getAttribute(settings.dataNameDraggable);
        return toBoolean(value);
    }

    let setIsDraggable = (element, value) => {
        element.setAttribute(settings.dataNameIsDraggable, value);
    }

    let isDraggable = (element) => {
        let value = element.getAttribute(settings.dataNameIsDraggable);
        return toBoolean(value);
    }

    let shouldResize = (element) => {
        let value = element.getAttribute(settings.dataNameResizable);
        return toBoolean(value);
    }

    let setIsResizable = (element, value) => {
        element.setAttribute(settings.dataNameIsResizable, value);
    }

    let isResizable = (element) => {
        let value = element.getAttribute(settings.dataNameIsResizable);
        return toBoolean(value);
    }

    let verifyElement = (element) => {
        if (isString(element)) {
            element = document.querySelector(element);
        }
        if (isNull(element)) {
            throw new TypeError(`Unable to process. Element provided is null`);
        } else if (!isElement(element)) {
            throw new TypeError(`Unable to process element of type: ${typeof element}. Reason: '${element}' is not an HTMLElement.`);
        }
        return element;
    }

    let addClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);

        let modified = false;
        if (cssClass.length > 0 && !hasClass(element, cssClass)) {
            element.classList.add(cssClass)
            modified = true;
        }
        return modified;
    }

    let removeClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);

        let modified = false;
        if (cssClass.length > 0 && hasClass(element, cssClass)) {
            element.classList.remove(cssClass);
            modified = true;
        }
        return modified;
    }

    let hasClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);
        return element.classList.contains(cssClass);
    }

    let isString = (item) => {
        return 'string' === typeof item;
    }

    let isNull = (item) => {
        return undefined === item || null === item;
    }

    let isElement = (item) => {
        let value = false;
        try {
            value = item instanceof HTMLElement || item instanceof HTMLDocument;
        }
        catch (e) {
            value = (typeof item==="object") &&
                (item.nodeType===1) && (typeof item.style === "object") &&
                (typeof item.ownerDocument ==="object");
        }
        return value;
    }

    let toBoolean = (value) => {
        value = String(value).trim().toLowerCase();
        let ret = false;
        switch (value) {
            case 'true': case 'yes': case '1':
                ret = true;
                break;
        }
        return ret;
    }

    let isEmpty = (str) => {
        return isNull(str) || String(str).trim().length < 1;
    }

    let randomFromTo = (from, to) => {
        return Math.floor(Math.random() * (to - from + 1) + from);
    }

    (function (factory) {
        if (typeof define === 'function' && define.amd) {
            define([], factory);
        } else if (typeof exports === 'object') {
            module.exports = factory();
        }
    }(function() { return namespace; })); 
}(Modal)); // http://programmingnotes.org/
			
				
					
				
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						// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Modal.js
//    Description: Javascript that handles modal popup related functions
//    Example:
//        // Show Modal
//        Modal.show('selector')
//
//        // Hide Modal
//        Modal.hide('selector')
// ============================================================================
/**
* NAMESPACE: Modal
* USE: Handles Modal related functions
*/
var Modal = Modal || {};
(function(namespace) {
    'use strict';
 
// -- Public data --
    // Property to hold public variables and functions
    let exposed = namespace;
 
    // Set class names and other shared data
    const settings = {
        handleTypeResize: 'resize',
        handleTypeDrag: 'drag',
 
        // Element class names
        classNameModal: '.modal',
        classNameModalPanel: '.modal-panel',
        classNameCloseButton: '.modal-close-button',
        classNameModalHeader: '.modal-header',
        classNameModalHeaderText: '.modal-header-text',
        classNameModalBody: '.modal-body',
        classNameModalFooter: '.modal-footer',
        classNameModalFooterText: '.modal-footer-text',
        classNameDraggable: '.modal-draggable',
        classNameDraggableIcon: '.icon',
        classNameShow: '.show',
        classNameResizable: '.modal-resizable',
        classNameResizableIcon: '.icon',
        classNameDialog: '.dialog',
        classNameButton: '.modal-button',
        classNameButtonCancel: '.cancel',
        classNameButtonOK: '.ok',
        classNameButtonContainer: '.buttonContainer',
        classNameResizeMargin: '.resizeMargin',
 
        // Element data names
        dataNameCloseOnOuterClick: 'data-closeOnOuterClick',
        dataNameDraggable: 'data-draggable',
        dataNameIsDraggable: 'data-isDraggable',
        dataNameResizable: 'data-resizable',
        dataNameIsResizable: 'data-isResizable',
        cleanClassName: (str) => {
            return str ? str.trim().replace('.', '') : '';
        },
    };
 
    exposed.settings = settings;
 
    /**
    * FUNCTION: init
    * USE: Initializes the modal button clicks.
    * @param element: JavaScript element to search for modals.
    * @return: N/A.
    */
    exposed.init = (element = document) => {
        addClickEvents(element);
    }
 
    /**
    * FUNCTION: show
    * USE: Shows the modal popup.
    * @param element: JavaScript element/String selector of the modal to show.
    * @return: N/A.
    */
    exposed.show = (element) => {
        element = verifyElement(element);
        addClass(element, settings.classNameShow);
    }
 
    /**
    * FUNCTION: hide
    * USE: Hides the modal popup.
    * @param element: JavaScript element/String selector of the modal to hide.
    * @return: N/A.
    */
    exposed.hide = (element) => {
        element = verifyElement(element);
        resetPosition(element);
        removeClass(element, settings.classNameShow);
    }
 
    /**
    * FUNCTION: getPanel
    * USE: Returns the modal panel element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal panel element.
    */
    exposed.getPanel = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalPanel);
    }
 
    /**
    * FUNCTION: getHeader
    * USE: Returns the modal header element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal header element.
    */
    exposed.getHeader = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalHeader);
    }
 
    /**
    * FUNCTION: getHeaderText
    * USE: Returns the modal header text element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal header text element.
    */
    exposed.getHeaderText = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalHeaderText);
    }
 
    /**
    * FUNCTION: getBody
    * USE: Returns the modal body element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal body element.
    */
    exposed.getBody = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalBody);
    }
 
    /**
    * FUNCTION: getFooter
    * USE: Returns the modal footer element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal footer element.
    */
    exposed.getFooter = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalFooter);
    }
 
    /**
    * FUNCTION: getFooterText
    * USE: Returns the modal footer text element.
    * @param element: JavaScript element/String selector of the modal.
    * @return: The modal footer text element.
    */
    exposed.getFooterText = (element) => {
        element = verifyElement(element);
        return element.querySelector(settings.classNameModalFooterText);
    }
 
    /**
    * FUNCTION: showDialog
    * USE: Shows a modal dialog box with an OK/Cancel button.
    * @param options: An object of initialization options.
    *   Its made up of the following properties:
    *   {
    *       title: The title of the dialog
    *       body: The content body of the dialog
    *       onShow(): Optional. Function that allows to do something before show.
    *          Return false to stop showing process
    *       onHide(): Optional. Function that allows to do something before hide.
    *          Return false to stop hidding process
    *       onDestroy(): Optional. Function that allows to do something before
    *          destroy. Return false to stop destroying process
    *       closeOnOuterClick: Optional. Determines if the dialog should close
    *          on outer dialog click. Default is False
    *       draggable: Optional. Determines if the dialog is draggable.
    *          Default is False
    *       resizable: Optional. Determines if the dialog is resizable.
    *          Default is False
    *       autoOpen: Optional. Determines if the dialog should auto open.
    *          Default is True
    *       draggable: Optional. Determines if the dialog is draggable.
    *          Default is False
    *       destroyOnHide: Optional. Determines if the dialog should be removed
    *          from DOM after hiding. Default is True
    *       buttons: Optional. Object allows to add custom buttons to the dialog
    *   }
    * @return: The modal dialog object.
    */
    exposed.showDialog = (options) => {
        options = verifyOptions(options);
        let dialog = createDialog(options);
        if (toBoolean(options.autoOpen)) {
            dialog.show();
        }
        return dialog;
    }
 
// -- Private data --
    let verifyOptions = (options) => {
        if (typeof options !== 'object') {
            let body = options;
            options = {};
            options.body = body;
        }
        return options;
    }
 
    let createDialog = (options) => {
        let defaultButtons = {
            cancel: {
                text: 'Cancel',
                cssClass: settings.classNameButtonCancel,
                visible: true,
            },
            ok: {
                text: 'OK',
                cssClass: settings.classNameButtonOK,
                visible: true,
            },
        };
 
        copyDefaults(options, defaultButtons);
 
        let modalButtons = options.buttons;
        let container = document.body;
        let modal = createElement('section', [settings.classNameModal, settings.classNameDialog]);
        let modalPanel = createElement('article', [settings.classNameModalPanel, settings.classNameDialog]);
        let modalHeader = createElement('header', [settings.classNameModalHeader, settings.classNameDialog]);
        let modalHeaderText = createElement('div', [settings.classNameModalHeaderText, settings.classNameDialog]);
        let modalBody = createElement('div', [settings.classNameModalBody, settings.classNameDialog]);
        let modalFooter = createElement('footer', [settings.classNameModalFooter, settings.classNameDialog]);
        let buttonContainer = createElement('div', [settings.classNameButtonContainer]);
 
        modal.appendChild(modalPanel);
        modalPanel.appendChild(modalHeader);
        modalHeader.appendChild(modalHeaderText);
        modalPanel.appendChild(modalBody);
        modalPanel.appendChild(modalFooter);
        modalFooter.appendChild(buttonContainer);
 
        let showHeaderCloseButton = true;
        let keys = Object.keys(modalButtons);
        keys.forEach((prop, index) => {
            prop = prop.toLowerCase();
            let buttonOptions = modalButtons[prop];
            if (!isNull(buttonOptions.visible) && !toBoolean(buttonOptions.visible)) {
                return false;
            }
 
            let text = buttonOptions.text || '';
            let cssClass = buttonOptions.cssClass || '';
            let button = createElement('button', [settings.classNameButton, settings.classNameDialog, cssClass]);
            button.innerHTML = !isNull(text) && isEmpty(text) ? '&nbsp;' : text;
            buttonContainer.appendChild(button)
 
            registerEvents(button, ['click'], (eventClick) => {
                if (buttonOptions.onClick) {
                    let value = buttonOptions.onClick.call(button, eventClick);
                    if (!isNull(value) && !value) {
                        return;
                    }
                }
                hide(options.destroyOnHide);
            });
 
            if ((index + 1) === keys.length) {
                if (toBoolean(options.resizable)) {
                    addClass(button, settings.classNameResizeMargin);
                }
            }
            showHeaderCloseButton = false;
        });
 
        if (showHeaderCloseButton) {
            let modalHeaderClose = createElement('div', [settings.classNameCloseButton, settings.classNameDialog]);
            modalHeader.appendChild(modalHeaderClose);
            registerEvents(modalHeaderClose, ['click'], (eventClick) => {
                hide(options.destroyOnHide);
            });
        }
 
        modalHeaderText.innerHTML = options.title || '';
        modalBody.innerHTML = options.body || '';
 
        modal.id = `modal_${randomFromTo(1271991, 7281987)}`;
        if (toBoolean(options.closeOnOuterClick)) {
            modal.setAttribute(settings.dataNameCloseOnOuterClick, options.closeOnOuterClick);
        }
        if (toBoolean(options.draggable)) {
            modal.setAttribute(settings.dataNameDraggable, options.draggable);
        }
        if (toBoolean(options.resizable)) {
            modal.setAttribute(settings.dataNameResizable, options.resizable);
        }
        container.appendChild(modal);
 
        options.autoOpen = !isNull(options.autoOpen) ? options.autoOpen : true;
        if (!options.autoOpen) {
            if (isNull(options.destroyOnHide)) {
                options.destroyOnHide = false;
            }
        }
        options.destroyOnHide = !isNull(options.destroyOnHide) ? options.destroyOnHide : true;
 
        let show = () => {
            if (options.onShow) {
                let value = options.onShow.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            setTimeout(()=> {
                exposed.show(modal);
            }, 10);
        }
        let hide = (destroyModal = false) => {
            if (options.onHide) {
                let value = options.onHide.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            exposed.hide(modal);
            if (destroyModal) {
                setTimeout(()=> {
                    destroy();
                }, 500);
            }
        }
        let destroy = () => {
            if (options.onDestroy) {
                let value = options.onDestroy.call(this);
                if (!isNull(value) && !value) {
                    return;
                }
            }
            if (!isDestroyed()) {
                container.removeChild(modal);
            }
        }
        let isDestroyed = () => {
            return !container.contains(modal);
        }
        let isShowing = () => {
            return hasClass(modal, settings.classNameShow);
        }
 
        addModalClickEvents(modal);
 
        if (getCoords(modalFooter).position === 'absolute') {
            modalFooter.style.position = 'relative';
            let coords = getCoords(modalFooter);
            modalPanel.style['min-width'] = coords.width + 'px';
            modalBody.style['padding-bottom'] = coords.height + 'px';
            modalFooter.style.position = null;
        }
 
        return {
            modal: modal,
            show: () => {
                show();
            },
            hide: () => {
                hide(options.destroyOnHide);
            },
            destroy: () => {
                hide(true);
            },
            isDestroyed: () => {
                return isDestroyed();
            },
            isShowing: () => {
                return isShowing();
            }
        };
    }
 
    let copyDefaults = (options, defaultButtons) => {
        if (isNull(options.buttons)) {
            options.buttons = defaultButtons
            return;
        }
        for (let prop in options.buttons) {
            prop = prop.toLowerCase();
            if (!defaultButtons.hasOwnProperty(prop)) {
                continue;
            }
            options.buttons[prop] = Object.assign(defaultButtons[prop], options.buttons[prop])
        }
    }
 
    let createElement = (type, classes) => {
        let element = document.createElement(type);
        if (!isNull(classes)) {
            classes.forEach(item => {
               addClass(element, item);
            });
        }
        return element;
    }
 
    let addClickEvents = (element) => {
        // Add misc click events for the modals
        let modals = element.querySelectorAll(settings.classNameModal);
        modals.forEach((modal, index) => {
            addModalClickEvents(modal, index);
        });
    }
 
    let addModalClickEvents = (modal, index = 0) => {
        let registerCloseOnOuterClick = false;
 
        // Add button clicks for the close button
        let closeButton = modal.querySelector(settings.classNameCloseButton);
        if (!isNull(closeButton)) {
            registerEvents(closeButton, ['click'], closeButtonEvent);
        }
        // Add functionalty to make the modal draggable
        if (shouldDrag(modal) && !isDraggable(modal)) {
            // Get elements and make sure they exist
            let panel = exposed.getPanel(modal);
            if (isNull(panel)) {
                throw new TypeError(`Unable to make Modal #${index + 1} draggable. Reason: Modal has no 'Modal Panel' associated with it.`);
            }
            // If a header exists, attach a drag handle to it
            let handle = getHandle(modal, settings.handleTypeDrag);
            if (isNull(handle)) {
                let header = exposed.getHeader(modal);
                if (!isNull(header)) {
                    handle = createHandle(header, settings.handleTypeDrag);
                } else {
                    addClass(panel, settings.classNameDraggable);
                }
            }
            makeDraggable({
                element: panel,
                handle: handle,
                keepInViewPort: true,
            });
            // Mark that this modal is draggable
            setIsDraggable(modal, true)
        }
 
        // Add functionalty to make the modal resizable
        if (shouldResize(modal) && !isResizable(modal)) {
            // Get elements and make sure they exist
            let panel = exposed.getPanel(modal);
            if (isNull(panel)) {
                throw new TypeError(`Unable to make Modal #${index + 1} resizable. Reason: Modal has no 'Modal Panel' associated with it.`);
            }
            // If a footer exists, attach a resize handle to it
            let handle = getHandle(modal, settings.handleTypeResize);
            if (isNull(handle)) {
                let footer = exposed.getFooter(modal);
                if (!isNull(footer)) {
                    handle = createHandle(footer, settings.handleTypeResize);
                } else {
                    addClass(panel, settings.classNameResizable);
                }
            }
            makeResizable({
                element: panel,
                handle: handle,
                keepInViewPort: true,
            });
            // Mark that this modal is resizable
            setIsResizable(modal, true);
        }
        // Check to see if we need to register the close on click event
        if (!registerCloseOnOuterClick) {
            registerCloseOnOuterClick = shouldCloseOnOuterClick(modal);
        }
 
        // Determine if the modal should close if the outer area is clicked
        if (registerCloseOnOuterClick) {
            registerEvents(document, ['click'], backgroundHideEvent);
        }
    }
 
    let registerEvents = (element, eventNames, func) => {
        eventNames.forEach((eventName, index) => {
            element.removeEventListener(eventName, func);
            element.addEventListener(eventName, func);
        });
    }
 
    let closeButtonEvent = (event) => {
        let closeButton = event.target || event.currentTarget;
        if (isNull(closeButton)) {
            return;
        }
        let modal = closeButton.closest(settings.classNameModal);
        exposed.hide(modal);
    }
 
    let backgroundHideEvent = (event) => {
        let target = event.target;
        if (isNull(target)
            || !isElement(target)
            || !hasClass(target, settings.classNameModal)
            || !hasClass(target, settings.classNameShow)
            || !shouldCloseOnOuterClick(target)) {
            return;
        }
        exposed.hide(target);
    }
 
    let createHandle = (container, type) => {
        let handle = document.createElement('div');
        switch (type) {
            case settings.handleTypeResize:
                addClass(handle, settings.classNameResizable);
                addClass(handle, settings.classNameResizableIcon);
                break;
            case settings.handleTypeDrag:
                addClass(handle, settings.classNameDraggable);
                addClass(handle, settings.classNameDraggableIcon);
                break;
            default:
                throw new TypeError(`Unknown handle type: ${type}`);
                break;
        }
        handle.setAttribute('tabindex', 0);
        container.appendChild(handle);
        return handle;
    }
 
    let getHandle = (element, type)  => {
        let selector = null;
        switch (type) {
            case settings.handleTypeResize:
                selector = `${settings.classNameResizable}${settings.classNameResizableIcon}`;
                break;
            case settings.handleTypeDrag:
                selector = `${settings.classNameDraggable}${settings.classNameDraggableIcon}`;
                break;
            default:
                throw new TypeError(`Unknown handle type: ${type}`);
                break;
        }
        return element.querySelector(selector);
    }
 
    let makeResizable = (options) => {
        let resizable = options.element || options;
        let handle = options.handle || resizable;
        let keepInViewPort = !isNull(options.keepInViewPort) ? options.keepInViewPort : false;
 
        let coords = getCoords(resizable);
        let initialWidth = coords.width;
        let initialHeight = coords.height;
 
        let mouseDown = (event) => {
            event.stopPropagation();
            // Get the mouse down position of the element
            let coords = getCoords(resizable);
            let offsetX = event.clientX - coords.width;
            let offsetY = event.clientY - coords.height;
 
            let moveElement = (event) => {
                // Get the new position
                let newWidth = (event.clientX - offsetX);
                let newHeight = (event.clientY - offsetY);
 
                // Make sure the width/height is never less than the initial values
                newWidth = Math.max(newWidth, initialWidth);
                newHeight = Math.max(newHeight, initialHeight);
 
                setPosition(resizable, {width: newWidth, height: newHeight});
 
                if (keepInViewPort && !isInViewport(resizable)) {
                    let bounding = resizable.getBoundingClientRect();
                    let viewInfo = getViewportInfo();
                    let viewportHeight = viewInfo.height;
                    let viewportWidth = viewInfo.width;
                    if (bounding.bottom > viewportHeight) {
                        newHeight -= Math.abs(bounding.bottom - viewportHeight);
                    }
                    if (bounding.right > viewportWidth) {
                        newWidth -= Math.abs(bounding.right - viewportWidth);
                    }
                    setPosition(resizable, {width: newWidth, height: newHeight});
                }
            }
            let reset = (event) => {
                document.removeEventListener('mousemove', moveElement);
                document.removeEventListener('mouseup', reset);
            }
            document.addEventListener('mouseup', reset);
            document.addEventListener('mousemove', moveElement);
        }
        addTouchSupport(handle);
        handle.addEventListener('mousedown', mouseDown);
    }
 
    let makeDraggable = (options) => {
        let draggable = options.element || options;
        let handle = options.handle || draggable;
        let keepInViewPort = !isNull(options.keepInViewPort) ? options.keepInViewPort : false;
 
        let mouseDown = (event) => {
            // Get the mouse down position of the element
            let coords = getCoords(draggable);
            let offsetX = event.clientX - coords.left;
            let offsetY = event.clientY - coords.top;
 
            let moveElement = (event) => {
                // Get the new position
                let newLeft = event.clientX - offsetX;
                let newTop = event.clientY - offsetY;
 
                setPosition(draggable, {left: newLeft, top: newTop});
 
                if (keepInViewPort && !isInViewport(draggable)) {
                    let bounding = draggable.getBoundingClientRect();
                    let viewInfo = getViewportInfo();
                    let viewportHeight = viewInfo.height;
                    let viewportWidth = viewInfo.width;
 
                    if (bounding.left < 0) {
                        newLeft += Math.abs(bounding.left);
                    }
                    if (bounding.top < 0) {
                        newTop += Math.abs(bounding.top);
                    }
                    if (bounding.bottom > viewportHeight) {
                        newTop -= Math.abs(bounding.bottom - viewportHeight);
                    }
                    if (bounding.right > viewportWidth) {
                        newLeft -= Math.abs(bounding.right - viewportWidth);
                    }
                    setPosition(draggable, {left: newLeft, top: newTop});
                }
            }
            let reset = (event) => {
                document.removeEventListener('mousemove', moveElement);
                document.removeEventListener('mouseup', reset);
            }
            document.addEventListener('mouseup', reset);
            document.addEventListener('mousemove', moveElement);
        }
        addTouchSupport(handle);
        handle.addEventListener('mousedown', mouseDown);
    }
 
    // Check to make sure the element will be within our viewport boundary
    let isInViewport = (element) => {
        let bounding = element.getBoundingClientRect();
        let viewInfo = getViewportInfo();
        return (
            bounding.top >= 0
            && bounding.left >= 0
            && bounding.bottom <= viewInfo.height
            && bounding.right <= viewInfo.width
        );
    }
 
    let getViewportInfo = () => {
        return {
            height: Math.max(window.innerHeight || 0, document.documentElement.clientHeight || 0),
            width: Math.max(window.innerWidth || 0, document.documentElement.clientWidth || 0),
        };
    }
 
    let getCoords = (element) => {
        let computedStyle = window.getComputedStyle(element);
        let intProps = ['left', 'top', 'width', 'height'];
        let result = {};
        for (const prop of intProps) {
            result[prop] = parseInt(computedStyle[prop], 10) || parseInt(element.style[prop], 10) || 0;
        }
        let stringProps = ['position'];
        for (const prop of stringProps) {
            result[prop] = (computedStyle[prop] || element.style[prop]).toLowerCase();
        }
        if (result.position !== 'relative') {
            if (!result.left) {
                result.left = element.offsetLeft || 0;
            }
            if (!result.top) {
                result.top = element.offsetTop || 0;
            }
            if (!result.width) {
                result.width = element.offsetWidth || 0;
            }
            if (!result.height) {
                result.height = element.offsetHeight || 0;
            }
        }
        return result;
    }
 
    let addTouchSupport = (element) => {
        let events = ['touchstart', 'touchmove', 'touchend', 'touchcancel'];
        registerEvents(element, events, touchConverter);
    }
 
    let touchConverter = (event) => {
        // stop touch event
        event.stopPropagation();
        event.preventDefault();
        let touches = event.changedTouches;
        if (!touches || touches.length < 1) {
            return;
        }
        let first = touches[0];
        let target = first.target;
        let type = '';
        switch (event.type) {
            case 'touchstart':
                type = 'mousedown';
                break;
            case 'touchmove':
                type = 'mousemove';
                break;
            case 'touchend': case 'touchcancel':
                type = 'mouseup';
                break;
            default:
                return;
        }
        let simulatedEvent = null;
        try {
            simulatedEvent = new MouseEvent(type, {
                bubbles: true,
                cancelable: true,
                view: window,
                screenX: first.screenX,
                screenY: first.screenY,
                clientX: first.clientX,
                clientY: first.clientY,
            });
        } catch (e) {
            simulatedEvent = document.createEvent('MouseEvent');
            simulatedEvent.initMouseEvent(type, true, true, window, 1,
                                      first.screenX, first.screenY,
                                      first.clientX, first.clientY, false,
                                      false, false, false, 0 /*left*/, null);
        }
        target.dispatchEvent(simulatedEvent);
    }
 
    let resetPosition = (element) => {
        let panel = exposed.getPanel(element);
        if (isNull(panel)) {
            return;
        }
        setPosition(panel, {left: null, top: null, width: null, height: null});
    }
 
    let setPosition = (element, options) => {
        for (const prop in options) {
            if (prop in element.style) {
                let value = options[prop];
                element.style[prop] = !isNull(value) ? parseInt(value, 10) + 'px' : value;
            }
        }
    }
 
    let shouldCloseOnOuterClick = (element) => {
        let value = element.getAttribute(settings.dataNameCloseOnOuterClick);
        return toBoolean(value);
    }
 
    let shouldDrag = (element) => {
        let value = element.getAttribute(settings.dataNameDraggable);
        return toBoolean(value);
    }
 
    let setIsDraggable = (element, value) => {
        element.setAttribute(settings.dataNameIsDraggable, value);
    }
 
    let isDraggable = (element) => {
        let value = element.getAttribute(settings.dataNameIsDraggable);
        return toBoolean(value);
    }
 
    let shouldResize = (element) => {
        let value = element.getAttribute(settings.dataNameResizable);
        return toBoolean(value);
    }
 
    let setIsResizable = (element, value) => {
        element.setAttribute(settings.dataNameIsResizable, value);
    }
 
    let isResizable = (element) => {
        let value = element.getAttribute(settings.dataNameIsResizable);
        return toBoolean(value);
    }
 
    let verifyElement = (element) => {
        if (isString(element)) {
            element = document.querySelector(element);
        }
        if (isNull(element)) {
            throw new TypeError(`Unable to process. Element provided is null`);
        } else if (!isElement(element)) {
            throw new TypeError(`Unable to process element of type: ${typeof element}. Reason: '${element}' is not an HTMLElement.`);
        }
        return element;
    }
 
    let addClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);
 
        let modified = false;
        if (cssClass.length > 0 && !hasClass(element, cssClass)) {
            element.classList.add(cssClass)
            modified = true;
        }
        return modified;
    }
 
    let removeClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);
 
        let modified = false;
        if (cssClass.length > 0 && hasClass(element, cssClass)) {
            element.classList.remove(cssClass);
            modified = true;
        }
        return modified;
    }
 
    let hasClass = (element, cssClass) => {
        cssClass = settings.cleanClassName(cssClass);
        return element.classList.contains(cssClass);
    }
 
    let isString = (item) => {
        return 'string' === typeof item;
    }
 
    let isNull = (item) => {
        return undefined === item || null === item;
    }
 
    let isElement = (item) => {
        let value = false;
        try {
            value = item instanceof HTMLElement || item instanceof HTMLDocument;
        }
        catch (e) {
            value = (typeof item==="object") &&
                (item.nodeType===1) && (typeof item.style === "object") &&
                (typeof item.ownerDocument ==="object");
        }
        return value;
    }
 
    let toBoolean = (value) => {
        value = String(value).trim().toLowerCase();
        let ret = false;
        switch (value) {
            case 'true': case 'yes': case '1':
                ret = true;
                break;
        }
        return ret;
    }
 
    let isEmpty = (str) => {
        return isNull(str) || String(str).trim().length < 1;
    }
 
    let randomFromTo = (from, to) => {
        return Math.floor(Math.random() * (to - from + 1) + from);
    }
 
    (function (factory) {
        if (typeof define === 'function' && define.amd) {
            define([], factory);
        } else if (typeof exports === 'object') {
            module.exports = factory();
        }
    }(function() { return namespace; })); 
}(Modal)); // http://programmingnotes.org/

The following is Modal.css.





		
		
			Modal.css
			
CSS
			
			/*
// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Modal.css
//    Description: CSS for the modal popup
// ============================================================================
*/

@import url('https://fonts.googleapis.com/css?family=Roboto:400,400italic,500,500italic,700,700italic,900,900italic,300italic,300,100italic,100');

/* The Modal (background) */
.modal {
    position: fixed;
    z-index: 1;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.35);
    opacity: 0;
    visibility: hidden;
    transform: scale(1.1);
    transition: visibility 0s linear 0.25s, opacity 0.25s 0s, transform 0.25s;
    display: flex;
    justify-content: center;
}

/* Modal Content */
.modal-panel {
    position: absolute;
    background-color: #fefefe;
    margin: auto;
    padding: 0;
    border: 1px solid #888;
    min-width: 400px;
    max-width: 80%;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    border-radius: 10px;
    min-height: 135px;
    display: table;
}

.modal-close-button {
    position: absolute;
    color: white;
    font-size: 28px;
    display: inline-block;
    text-decoration: none;
    cursor: pointer;
    right: 0;
    margin-right: 15px;
}

.modal-close-button:hover,
.modal-close-button:focus {
    color: black;
}

.modal-close-button:after {
    content: '×';
}

.modal-body {
    padding-bottom: 52px;
}

.modal-header, .modal-footer {
    padding: 2px;
    background-color: #064685;
    color: white;
    min-height: 50px;
    box-sizing: border-box;
    text-align: center;
}

.modal-header {
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
}

.modal-footer {
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
    bottom: 0;
    position: absolute;
    width: 99.8%;
    transform: translateY(1%);
}

.modal-header-text, .modal-footer-text {
    font-size: 19px;
    display: inline-block;
    max-width: 80%;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-top: auto;
    transform: translateY(50%);
}

.modal-header-text.bold, .modal-footer-text.bold {
    font-weight: bold;
}

.modal.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1.0);
    transition: visibility 0s linear 0s, opacity 0.25s 0s, transform 0.25s;
}

.modal-draggable {
    cursor: move;
    cursor: grab;
}

.modal-draggable:active {
    cursor: move;
    cursor: grabbing;
}

.modal-draggable.icon {
    position: absolute;
    color: grey;
    font-size: 23px;
    display: inline-block;
    text-decoration: none;
    left: 0;
    margin-left: 15px;
    outline: none;
}

.modal-draggable.icon:hover, .modal-resizable.icon:hover {
    color: white;
    background-color: rgba(0,191,165,.04)
}

.modal-draggable.icon:active, .modal-resizable.icon:active {
    color: yellow;
}

.modal-draggable.icon:after {
    content: '⮀';
}

.modal-resizable {
    cursor: move;
    cursor: grab;
    cursor: nwse-resize;
}

.modal-resizable:active {
    cursor: move;
    cursor: grabbing;
    cursor: nwse-resize;
}

.modal-resizable.icon {
    position: absolute;
    color: grey;
    font-size: 20px;
    display: inline-block;
    text-decoration: none;
    width: 10px;
    height: 10px;
    right: 0;
    margin-right: 10px;
    outline: none;
    transform: translateY(-200%);
    bottom: 0;
}

.modal-resizable.icon:after {
    content: '⇲';
}

.modal-header, .modal-footer, .modal-draggable.icon,
.modal-close-button, .modal-body, .modal-button {
    font-family: "Roboto",sans-serif, Marmelad,"Lucida Grande",Arial,"Hiragino Sans GB",Georgia,"Helvetica Neue",Helvetica;
}

.modal-button {
    padding: 4px;
    background-color: #d2d2d2;
    text-align: center;
    text-decoration: none;
    color: black;
    border-radius: 15px;
    cursor: pointer;
    min-width: 100px;
    border: none;
    outline: #eee;
    font-size: 15px;
}

.modal-button:hover {
    background-color:#bdbdbd;
}

.modal-button.cancel {
}
.modal-button.ok {
}

.modal.dialog {
}
.modal-panel.dialog {
}
.modal-header.dialog {
}
.modal-header-text.dialog {
}
.modal-footer.dialog {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 10px;
}
.modal-body.dialog {
    margin: 20px;
    text-align: center;    
}
.modal-button.dialog {
    min-width: 150px;
    margin-top: 1px;
}


.modal-button:not(:last-child) {
	margin-right: 20px;
}
.modal-button.resizeMargin {
	margin-right: 16px;
}
.buttonContainer {
	max-width: 600px;
}/* // http://programmingnotes.org/ */
			
				
					
				
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						/*
// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  Modal.css
//    Description: CSS for the modal popup
// ============================================================================
*/
 
@import url('https://fonts.googleapis.com/css?family=Roboto:400,400italic,500,500italic,700,700italic,900,900italic,300italic,300,100italic,100');
 
/* The Modal (background) */
.modal {
    position: fixed;
    z-index: 1;
    padding-top: 60px;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0,0,0,0.35);
    opacity: 0;
    visibility: hidden;
    transform: scale(1.1);
    transition: visibility 0s linear 0.25s, opacity 0.25s 0s, transform 0.25s;
    display: flex;
    justify-content: center;
}
 
/* Modal Content */
.modal-panel {
    position: absolute;
    background-color: #fefefe;
    margin: auto;
    padding: 0;
    border: 1px solid #888;
    min-width: 400px;
    max-width: 80%;
    box-shadow: 0 4px 8px 0 rgba(0,0,0,0.2),0 6px 20px 0 rgba(0,0,0,0.19);
    border-radius: 10px;
    min-height: 135px;
    display: table;
}
 
.modal-close-button {
    position: absolute;
    color: white;
    font-size: 28px;
    display: inline-block;
    text-decoration: none;
    cursor: pointer;
    right: 0;
    margin-right: 15px;
}
 
.modal-close-button:hover,
.modal-close-button:focus {
    color: black;
}
 
.modal-close-button:after {
    content: '×';
}
 
.modal-body {
    padding-bottom: 52px;
}
 
.modal-header, .modal-footer {
    padding: 2px;
    background-color: #064685;
    color: white;
    min-height: 50px;
    box-sizing: border-box;
    text-align: center;
}
 
.modal-header {
    border-top-left-radius: 6px;
    border-top-right-radius: 6px;
}
 
.modal-footer {
    border-bottom-left-radius: 6px;
    border-bottom-right-radius: 6px;
    bottom: 0;
    position: absolute;
    width: 99.8%;
    transform: translateY(1%);
}
 
.modal-header-text, .modal-footer-text {
    font-size: 19px;
    display: inline-block;
    max-width: 80%;
    overflow: hidden;
    white-space: nowrap;
    text-overflow: ellipsis;
    margin-top: auto;
    transform: translateY(50%);
}
 
.modal-header-text.bold, .modal-footer-text.bold {
    font-weight: bold;
}
 
.modal.show {
    opacity: 1;
    visibility: visible;
    transform: scale(1.0);
    transition: visibility 0s linear 0s, opacity 0.25s 0s, transform 0.25s;
}
 
.modal-draggable {
    cursor: move;
    cursor: grab;
}
 
.modal-draggable:active {
    cursor: move;
    cursor: grabbing;
}
 
.modal-draggable.icon {
    position: absolute;
    color: grey;
    font-size: 23px;
    display: inline-block;
    text-decoration: none;
    left: 0;
    margin-left: 15px;
    outline: none;
}
 
.modal-draggable.icon:hover, .modal-resizable.icon:hover {
    color: white;
    background-color: rgba(0,191,165,.04)
}
 
.modal-draggable.icon:active, .modal-resizable.icon:active {
    color: yellow;
}
 
.modal-draggable.icon:after {
    content: '⮀';
}
 
.modal-resizable {
    cursor: move;
    cursor: grab;
    cursor: nwse-resize;
}
 
.modal-resizable:active {
    cursor: move;
    cursor: grabbing;
    cursor: nwse-resize;
}
 
.modal-resizable.icon {
    position: absolute;
    color: grey;
    font-size: 20px;
    display: inline-block;
    text-decoration: none;
    width: 10px;
    height: 10px;
    right: 0;
    margin-right: 10px;
    outline: none;
    transform: translateY(-200%);
    bottom: 0;
}
 
.modal-resizable.icon:after {
    content: '⇲';
}
 
.modal-header, .modal-footer, .modal-draggable.icon,
.modal-close-button, .modal-body, .modal-button {
    font-family: "Roboto",sans-serif, Marmelad,"Lucida Grande",Arial,"Hiragino Sans GB",Georgia,"Helvetica Neue",Helvetica;
}
 
.modal-button {
    padding: 4px;
    background-color: #d2d2d2;
    text-align: center;
    text-decoration: none;
    color: black;
    border-radius: 15px;
    cursor: pointer;
    min-width: 100px;
    border: none;
    outline: #eee;
    font-size: 15px;
}
 
.modal-button:hover {
    background-color:#bdbdbd;
}
 
.modal-button.cancel {
}
.modal-button.ok {
}
 
.modal.dialog {
}
.modal-panel.dialog {
}
.modal-header.dialog {
}
.modal-header-text.dialog {
}
.modal-footer.dialog {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100%;
    padding: 10px;
}
.modal-body.dialog {
    margin: 20px;
    text-align: center;    
}
.modal-button.dialog {
    min-width: 150px;
    margin-top: 1px;
}
 
 
.modal-button:not(:last-child) {
	margin-right: 20px;
}
.modal-button.resizeMargin {
	margin-right: 16px;
}
.buttonContainer {
	max-width: 600px;
}/* // http://programmingnotes.org/ */

6. More Examples

Below are more examples demonstrating the use of ‘Modal.js‘. Don’t forget to include the module when running the examples!





		
		
			More Examples
			
XHTML
			
			<!--
// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  modalDemo.html
//    Description: Demonstrates the use of Modal.js
// ============================================================================
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>My Programming Notes Modal.js Demo</title>
<style>
.main {
    text-align:center;
    margin-left:auto;
    margin-right:auto;
}

.button {
    padding: 5px;
    background-color: #d2d2d2;
    height:100%;
    text-align:center;
    text-decoration:none;
    color:black;

    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;

    border-radius: 15px;
    cursor: pointer;
    width: 120px;
}

.button:hover {
    background-color:#bdbdbd;
}

.inline {
    display:inline-block;
}

.center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.modal-body {
	padding: 2px 16px;
}
</style>

<!-- // Include module -->
<link type="text/css" rel="stylesheet" href="./Modal.css">
<script type="text/javascript" src="./Modal.js"></script>

</head>
<body>
<div class="main">
    My Programming Notes Modal.js Demo

    <div style="margin-top: 20px;">
        <div id="btnShow" class="inline button">
            Show
        </div>
    </div>

    <!-- The Modal Background-->
    <section id="modalExample" class="modal"
            data-closeOnOuterClick="true"
            data-draggable="true"
            data-resizable="true"
        >
        <!-- Modal Panel -->
        <article class="modal-panel">
            <header class="modal-header">
                <div class="modal-header-text">
                    Modal Header
                </div>
                <div class="modal-close-button"></div>
            </header>

            <div class="modal-body">
                <p>Some text in the Modal Body</p>
                <p>Some other text...</p>
            </div>

            <footer class="modal-footer">
                <div class="modal-footer-text">
                    Modal Footer
                </div>
            </footer>
        </article>
    </section>

</div>

<script>
document.addEventListener("DOMContentLoaded", function(eventLoaded) {
    // Optional: Sets up the initial default button clicks
    Modal.init();

    // Show the modal
    document.querySelector('#btnShow').addEventListener('click', (event) => {
        Modal.show('#modalExample');
    });

    // Get the modal element
    let modalElement = document.querySelector('#modalExample');    
    setTimeout(() => {
        Modal.show(modalElement);
        setTimeout(() => {
            Modal.hide(modalElement);
        }, 2000);
    }, 200);
});
</script>
</body>
</html><!-- // http://programmingnotes.org/ -->
			
				
					
				
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						<!--
// ============================================================================
//    Author: Kenneth Perkins
//    Date:   Sept 4, 2020
//    Taken From: http://programmingnotes.org/
//    File:  modalDemo.html
//    Description: Demonstrates the use of Modal.js
// ============================================================================
-->
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>My Programming Notes Modal.js Demo</title>
<style>
.main {
    text-align:center;
    margin-left:auto;
    margin-right:auto;
}
 
.button {
    padding: 5px;
    background-color: #d2d2d2;
    height:100%;
    text-align:center;
    text-decoration:none;
    color:black;
 
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
 
    border-radius: 15px;
    cursor: pointer;
    width: 120px;
}
 
.button:hover {
    background-color:#bdbdbd;
}
 
.inline {
    display:inline-block;
}
 
.center {
    display: flex;
    justify-content: center;
    align-items: center;
}
 
.modal-body {
	padding: 2px 16px;
}
</style>
 
<!-- // Include module -->
<link type="text/css" rel="stylesheet" href="./Modal.css">
<script type="text/javascript" src="./Modal.js"></script>
 
</head>
<body>
<div class="main">
    My Programming Notes Modal.js Demo
 
    <div style="margin-top: 20px;">
        <div id="btnShow" class="inline button">
            Show
        </div>
    </div>
 
    <!-- The Modal Background-->
    <section id="modalExample" class="modal"
            data-closeOnOuterClick="true"
            data-draggable="true"
            data-resizable="true"
        >
        <!-- Modal Panel -->
        <article class="modal-panel">
            <header class="modal-header">
                <div class="modal-header-text">
                    Modal Header
                </div>
                <div class="modal-close-button"></div>
            </header>
 
            <div class="modal-body">
                <p>Some text in the Modal Body</p>
                <p>Some other text...</p>
            </div>
 
            <footer class="modal-footer">
                <div class="modal-footer-text">
                    Modal Footer
                </div>
            </footer>
        </article>
    </section>
 
</div>
 
<script>
document.addEventListener("DOMContentLoaded", function(eventLoaded) {
    // Optional: Sets up the initial default button clicks
    Modal.init();
 
    // Show the modal
    document.querySelector('#btnShow').addEventListener('click', (event) => {
        Modal.show('#modalExample');
    });
 
    // Get the modal element
    let modalElement = document.querySelector('#modalExample');    
    setTimeout(() => {
        Modal.show(modalElement);
        setTimeout(() => {
            Modal.hide(modalElement);
        }, 2000);
    }, 200);
});
</script>
</body>
</html><!-- // http://programmingnotes.org/ -->

QUICK NOTES:
The highlighted lines are sections of interest to look out for.

The code is heavily commented, so no further insight is necessary. If you have any questions, feel free to leave a comment below.

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Posted in: JavaScript, Vanilla JavaScript Tags: css, html, javascript

JavaScript/CSS/HTML || Modal.js – Simple Modal Popup Panel Using Vanilla JavaScript

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