368 lines
11 KiB
JavaScript
368 lines
11 KiB
JavaScript
/*global H5P*/
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H5P.ConfirmationDialog = (function (EventDispatcher) {
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"use strict";
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/**
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* Create a confirmation dialog
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*
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* @param [options] Options for confirmation dialog
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* @param [options.instance] Instance that uses confirmation dialog
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* @param [options.headerText] Header text
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* @param [options.dialogText] Dialog text
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* @param [options.cancelText] Cancel dialog button text
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* @param [options.confirmText] Confirm dialog button text
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* @constructor
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*/
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function ConfirmationDialog(options) {
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EventDispatcher.call(this);
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var self = this;
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// Make sure confirmation dialogs have unique id
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H5P.ConfirmationDialog.uniqueId += 1;
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var uniqueId = H5P.ConfirmationDialog.uniqueId;
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// Default options
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options = options || {};
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options.headerText = options.headerText || H5P.t('confirmDialogHeader');
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options.dialogText = options.dialogText || H5P.t('confirmDialogBody');
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options.cancelText = options.cancelText || H5P.t('cancelLabel');
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options.confirmText = options.confirmText || H5P.t('confirmLabel');
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/**
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* Handle confirming event
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* @param {Event} e
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*/
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function dialogConfirmed(e) {
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self.hide();
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self.trigger('confirmed');
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e.preventDefault();
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}
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/**
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* Handle dialog canceled
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* @param {Event} e
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*/
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function dialogCanceled(e) {
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self.hide();
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self.trigger('canceled');
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e.preventDefault();
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}
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/**
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* Flow focus to element
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* @param {HTMLElement} element Next element to be focused
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* @param {Event} e Original tab event
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*/
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function flowTo(element, e) {
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element.focus();
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e.preventDefault();
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}
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// Offset of exit button
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var exitButtonOffset = 2 * 16;
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var shadowOffset = 8;
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// Determine if we are too large for our container and must resize
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var resizeIFrame = false;
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// Create background
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var popupBackground = document.createElement('div');
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popupBackground.classList
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.add('h5p-confirmation-dialog-background', 'hidden', 'hiding');
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// Create outer popup
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var popup = document.createElement('div');
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popup.classList.add('h5p-confirmation-dialog-popup', 'hidden');
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popup.setAttribute('role', 'dialog');
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popup.setAttribute('aria-labelledby', 'h5p-confirmation-dialog-dialog-text-' + uniqueId);
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popupBackground.appendChild(popup);
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popup.addEventListener('keydown', function (e) {
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if (e.which === 27) {// Esc key
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// Exit dialog
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dialogCanceled(e);
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}
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});
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// Popup header
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var header = document.createElement('div');
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header.classList.add('h5p-confirmation-dialog-header');
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popup.appendChild(header);
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// Header text
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var headerText = document.createElement('div');
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headerText.classList.add('h5p-confirmation-dialog-header-text');
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headerText.innerHTML = options.headerText;
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header.appendChild(headerText);
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// Popup body
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var body = document.createElement('div');
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body.classList.add('h5p-confirmation-dialog-body');
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popup.appendChild(body);
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// Popup text
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var text = document.createElement('div');
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text.classList.add('h5p-confirmation-dialog-text');
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text.innerHTML = options.dialogText;
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text.id = 'h5p-confirmation-dialog-dialog-text-' + uniqueId;
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body.appendChild(text);
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// Popup buttons
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var buttons = document.createElement('div');
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buttons.classList.add('h5p-confirmation-dialog-buttons');
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body.appendChild(buttons);
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// Cancel button
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var cancelButton = document.createElement('button');
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cancelButton.classList.add('h5p-core-cancel-button');
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cancelButton.textContent = options.cancelText;
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// Confirm button
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var confirmButton = document.createElement('button');
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confirmButton.classList.add('h5p-core-button');
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confirmButton.classList.add('h5p-confirmation-dialog-confirm-button');
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confirmButton.textContent = options.confirmText;
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// Exit button
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var exitButton = document.createElement('button');
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exitButton.classList.add('h5p-confirmation-dialog-exit');
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exitButton.setAttribute('aria-hidden', 'true');
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exitButton.tabIndex = -1;
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exitButton.title = options.cancelText;
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// Cancel handler
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cancelButton.addEventListener('click', dialogCanceled);
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cancelButton.addEventListener('keydown', function (e) {
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if (e.which === 32) { // Space
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dialogCanceled(e);
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}
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else if (e.which === 9 && e.shiftKey) { // Shift-tab
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flowTo(confirmButton, e);
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}
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});
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buttons.appendChild(cancelButton);
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// Confirm handler
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confirmButton.addEventListener('click', dialogConfirmed);
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confirmButton.addEventListener('keydown', function (e) {
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if (e.which === 32) { // Space
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dialogConfirmed(e);
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}
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else if (e.which === 9 && !e.shiftKey) { // Tab
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flowTo(cancelButton, e);
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}
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});
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buttons.appendChild(confirmButton);
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// Exit handler
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exitButton.addEventListener('click', dialogCanceled);
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exitButton.addEventListener('keydown', function (e) {
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if (e.which === 32) { // Space
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dialogCanceled(e);
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}
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});
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popup.appendChild(exitButton);
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// Wrapper element
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var wrapperElement;
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// Focus capturing
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var focusPredator;
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// Maintains hidden state of elements
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var wrapperSiblingsHidden = [];
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var popupSiblingsHidden = [];
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// Element with focus before dialog
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var previouslyFocused;
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/**
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* Set parent of confirmation dialog
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* @param {HTMLElement} wrapper
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* @returns {H5P.ConfirmationDialog}
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*/
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this.appendTo = function (wrapper) {
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wrapperElement = wrapper;
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return this;
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};
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/**
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* Capture the focus element, send it to confirmation button
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* @param {Event} e Original focus event
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*/
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var captureFocus = function (e) {
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if (!popupBackground.contains(e.target)) {
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e.preventDefault();
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confirmButton.focus();
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}
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};
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/**
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* Hide siblings of element from assistive technology
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*
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* @param {HTMLElement} element
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* @returns {Array} The previous hidden state of all siblings
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*/
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var hideSiblings = function (element) {
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var hiddenSiblings = [];
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var siblings = element.parentNode.children;
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var i;
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for (i = 0; i < siblings.length; i += 1) {
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// Preserve hidden state
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hiddenSiblings[i] = siblings[i].getAttribute('aria-hidden') ?
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true : false;
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if (siblings[i] !== element) {
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siblings[i].setAttribute('aria-hidden', true);
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}
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}
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return hiddenSiblings;
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};
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/**
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* Restores assistive technology state of element's siblings
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*
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* @param {HTMLElement} element
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* @param {Array} hiddenSiblings Hidden state of all siblings
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*/
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var restoreSiblings = function (element, hiddenSiblings) {
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var siblings = element.parentNode.children;
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var i;
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for (i = 0; i < siblings.length; i += 1) {
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if (siblings[i] !== element && !hiddenSiblings[i]) {
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siblings[i].removeAttribute('aria-hidden');
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}
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}
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};
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/**
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* Start capturing focus of parent and send it to dialog
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*/
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var startCapturingFocus = function () {
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focusPredator = wrapperElement.parentNode || wrapperElement;
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focusPredator.addEventListener('focus', captureFocus, true);
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};
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/**
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* Clean up event listener for capturing focus
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*/
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var stopCapturingFocus = function () {
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focusPredator.removeAttribute('aria-hidden');
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focusPredator.removeEventListener('focus', captureFocus, true);
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};
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/**
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* Hide siblings in underlay from assistive technologies
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*/
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var disableUnderlay = function () {
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wrapperSiblingsHidden = hideSiblings(wrapperElement);
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popupSiblingsHidden = hideSiblings(popupBackground);
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};
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/**
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* Restore state of underlay for assistive technologies
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*/
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var restoreUnderlay = function () {
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restoreSiblings(wrapperElement, wrapperSiblingsHidden);
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restoreSiblings(popupBackground, popupSiblingsHidden);
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};
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/**
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* Fit popup to container. Makes sure it doesn't overflow.
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* @params {number} [offsetTop] Offset of popup
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*/
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var fitToContainer = function (offsetTop) {
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var popupOffsetTop = parseInt(popup.style.top, 10);
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if (offsetTop) {
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popupOffsetTop = offsetTop;
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}
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// Overflows height
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if (popupOffsetTop + popup.offsetHeight > wrapperElement.offsetHeight) {
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popupOffsetTop = wrapperElement.offsetHeight - popup.offsetHeight - shadowOffset;
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}
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if (popupOffsetTop - exitButtonOffset <= 0) {
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popupOffsetTop = exitButtonOffset + shadowOffset;
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// We are too big and must resize
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resizeIFrame = true;
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}
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popup.style.top = popupOffsetTop + 'px';
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};
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/**
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* Show confirmation dialog
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* @params {number} offsetTop Offset top
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* @returns {H5P.ConfirmationDialog}
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*/
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this.show = function (offsetTop) {
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// Capture focused item
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previouslyFocused = document.activeElement;
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wrapperElement.appendChild(popupBackground);
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startCapturingFocus();
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disableUnderlay();
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popupBackground.classList.remove('hidden');
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fitToContainer(offsetTop);
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setTimeout(function () {
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popup.classList.remove('hidden');
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popupBackground.classList.remove('hiding');
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setTimeout(function () {
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// Focus confirm button
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confirmButton.focus();
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// Resize iFrame if necessary
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if (resizeIFrame && options.instance) {
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var minHeight = parseInt(popup.offsetHeight, 10) +
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exitButtonOffset + (2 * shadowOffset);
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self.setViewPortMinimumHeight(minHeight);
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options.instance.trigger('resize');
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resizeIFrame = false;
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}
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}, 100);
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}, 0);
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return this;
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};
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/**
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* Hide confirmation dialog
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* @returns {H5P.ConfirmationDialog}
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*/
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this.hide = function () {
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popupBackground.classList.add('hiding');
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popup.classList.add('hidden');
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// Restore focus
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stopCapturingFocus();
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previouslyFocused.focus();
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restoreUnderlay();
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setTimeout(function () {
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popupBackground.classList.add('hidden');
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wrapperElement.removeChild(popupBackground);
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self.setViewPortMinimumHeight(null);
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}, 100);
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return this;
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};
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/**
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* Sets the minimum height of the view port
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*
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* @param {number|null} minHeight
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*/
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this.setViewPortMinimumHeight = function (minHeight) {
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var container = document.querySelector('.h5p-container') || document.body;
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container.style.minHeight = (typeof minHeight === 'number') ? (minHeight + 'px') : minHeight;
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};
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}
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ConfirmationDialog.prototype = Object.create(EventDispatcher.prototype);
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ConfirmationDialog.prototype.constructor = ConfirmationDialog;
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return ConfirmationDialog;
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}(H5P.EventDispatcher));
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H5P.ConfirmationDialog.uniqueId = -1;
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