527 lines
17 KiB
JavaScript
527 lines
17 KiB
JavaScript
(function() {
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var supportCustomEvent = window.CustomEvent;
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if (!supportCustomEvent || typeof supportCustomEvent == 'object') {
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supportCustomEvent = function CustomEvent(event, x) {
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x = x || {};
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var ev = document.createEvent('CustomEvent');
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ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null);
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return ev;
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};
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supportCustomEvent.prototype = window.Event.prototype;
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}
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/**
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* Finds the nearest <dialog> from the passed element.
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*
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* @param {Element} el to search from
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* @return {HTMLDialogElement} dialog found
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*/
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function findNearestDialog(el) {
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while (el) {
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if (el.nodeName.toUpperCase() == 'DIALOG') {
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return /** @type {HTMLDialogElement} */ (el);
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}
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el = el.parentElement;
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}
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return null;
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}
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/**
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* Blur the specified element, as long as it's not the HTML body element.
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* This works around an IE9/10 bug - blurring the body causes Windows to
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* blur the whole application.
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*
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* @param {Element} el to blur
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*/
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function safeBlur(el) {
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if (el && el.blur && el != document.body) {
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el.blur();
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}
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}
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/**
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* @param {!NodeList} nodeList to search
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* @param {Node} node to find
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* @return {boolean} whether node is inside nodeList
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*/
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function inNodeList(nodeList, node) {
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for (var i = 0; i < nodeList.length; ++i) {
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if (nodeList[i] == node) {
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return true;
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}
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}
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return false;
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}
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/**
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* @param {!HTMLDialogElement} dialog to upgrade
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* @constructor
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*/
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function dialogPolyfillInfo(dialog) {
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this.dialog_ = dialog;
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this.replacedStyleTop_ = false;
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this.openAsModal_ = false;
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// Set a11y role. Browsers that support dialog implicitly know this already.
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if (!dialog.hasAttribute('role')) {
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dialog.setAttribute('role', 'dialog');
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}
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dialog.show = this.show.bind(this);
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dialog.showModal = this.showModal.bind(this);
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dialog.close = this.close.bind(this);
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if (!('returnValue' in dialog)) {
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dialog.returnValue = '';
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}
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this.maybeHideModal = this.maybeHideModal.bind(this);
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if ('MutationObserver' in window) {
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// IE11+, most other browsers.
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var mo = new MutationObserver(this.maybeHideModal);
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mo.observe(dialog, { attributes: true, attributeFilter: ['open'] });
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} else {
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dialog.addEventListener('DOMAttrModified', this.maybeHideModal);
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}
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// Note that the DOM is observed inside DialogManager while any dialog
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// is being displayed as a modal, to catch modal removal from the DOM.
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Object.defineProperty(dialog, 'open', {
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set: this.setOpen.bind(this),
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get: dialog.hasAttribute.bind(dialog, 'open')
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});
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this.backdrop_ = document.createElement('div');
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this.backdrop_.className = 'backdrop';
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this.backdropClick_ = this.backdropClick_.bind(this);
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}
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dialogPolyfillInfo.prototype = {
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get dialog() {
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return this.dialog_;
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},
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/**
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* Maybe remove this dialog from the modal top layer. This is called when
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* a modal dialog may no longer be tenable, e.g., when the dialog is no
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* longer open or is no longer part of the DOM.
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*/
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maybeHideModal: function() {
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if (!this.openAsModal_) { return; }
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if (this.dialog_.hasAttribute('open') &&
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document.body.contains(this.dialog_)) { return; }
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this.openAsModal_ = false;
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this.dialog_.style.zIndex = '';
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// This won't match the native <dialog> exactly because if the user set
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// top on a centered polyfill dialog, that top gets thrown away when the
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// dialog is closed. Not sure it's possible to polyfill this perfectly.
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if (this.replacedStyleTop_) {
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this.dialog_.style.top = '';
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this.replacedStyleTop_ = false;
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}
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// Optimistically clear the modal part of this <dialog>.
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this.backdrop_.removeEventListener('click', this.backdropClick_);
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if (this.backdrop_.parentElement) {
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this.backdrop_.parentElement.removeChild(this.backdrop_);
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}
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dialogPolyfill.dm.removeDialog(this);
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},
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/**
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* @param {boolean} value whether to open or close this dialog
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*/
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setOpen: function(value) {
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if (value) {
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this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', '');
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} else {
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this.dialog_.removeAttribute('open');
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this.maybeHideModal(); // nb. redundant with MutationObserver
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}
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},
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/**
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* Handles clicks on the fake .backdrop element, redirecting them as if
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* they were on the dialog itself.
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*
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* @param {!Event} e to redirect
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*/
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backdropClick_: function(e) {
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var redirectedEvent = document.createEvent('MouseEvents');
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redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window,
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e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey,
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e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget);
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this.dialog_.dispatchEvent(redirectedEvent);
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e.stopPropagation();
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},
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/**
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* Focuses on the first focusable element within the dialog. This will always blur the current
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* focus, even if nothing within the dialog is found.
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*/
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focus_: function() {
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// Find element with `autofocus` attribute, or fall back to the first form/tabindex control.
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var target = this.dialog_.querySelector('[autofocus]:not([disabled])');
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if (!target) {
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// Note that this is 'any focusable area'. This list is probably not exhaustive, but the
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// alternative involves stepping through and trying to focus everything.
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var opts = ['button', 'input', 'keygen', 'select', 'textarea'];
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var query = opts.map(function(el) {
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return el + ':not([disabled])';
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});
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// TODO(samthor): tabindex values that are not numeric are not focusable.
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query.push('[tabindex]:not([disabled]):not([tabindex=""])'); // tabindex != "", not disabled
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target = this.dialog_.querySelector(query.join(', '));
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}
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safeBlur(document.activeElement);
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target && target.focus();
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},
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/**
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* Sets the zIndex for the backdrop and dialog.
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*
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* @param {number} backdropZ
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* @param {number} dialogZ
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*/
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updateZIndex: function(backdropZ, dialogZ) {
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this.backdrop_.style.zIndex = backdropZ;
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this.dialog_.style.zIndex = dialogZ;
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},
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/**
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* Shows the dialog. If the dialog is already open, this does nothing.
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*/
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show: function() {
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if (!this.dialog_.open) {
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this.setOpen(true);
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this.focus_();
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}
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},
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/**
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* Show this dialog modally.
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*/
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showModal: function() {
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if (this.dialog_.hasAttribute('open')) {
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throw new Error('Failed to execute \'showModal\' on dialog: The element is already open, and therefore cannot be opened modally.');
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}
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if (!document.body.contains(this.dialog_)) {
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throw new Error('Failed to execute \'showModal\' on dialog: The element is not in a Document.');
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}
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if (!dialogPolyfill.dm.pushDialog(this)) {
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throw new Error('Failed to execute \'showModal\' on dialog: There are too many open modal dialogs.');
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}
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this.show();
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this.openAsModal_ = true;
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// Optionally center vertically, relative to the current viewport.
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if (dialogPolyfill.needsCentering(this.dialog_)) {
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dialogPolyfill.reposition(this.dialog_);
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this.replacedStyleTop_ = true;
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} else {
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this.replacedStyleTop_ = false;
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}
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// Insert backdrop.
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this.backdrop_.addEventListener('click', this.backdropClick_);
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this.dialog_.parentNode.insertBefore(this.backdrop_,
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this.dialog_.nextSibling);
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},
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/**
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* Closes this HTMLDialogElement. This is optional vs clearing the open
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* attribute, however this fires a 'close' event.
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*
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* @param {string=} opt_returnValue to use as the returnValue
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*/
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close: function(opt_returnValue) {
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if (!this.dialog_.hasAttribute('open')) {
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throw new Error('Failed to execute \'close\' on dialog: The element does not have an \'open\' attribute, and therefore cannot be closed.');
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}
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this.setOpen(false);
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// Leave returnValue untouched in case it was set directly on the element
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if (opt_returnValue !== undefined) {
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this.dialog_.returnValue = opt_returnValue;
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}
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// Triggering "close" event for any attached listeners on the <dialog>.
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var closeEvent = new supportCustomEvent('close', {
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bubbles: false,
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cancelable: false
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});
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this.dialog_.dispatchEvent(closeEvent);
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}
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};
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var dialogPolyfill = {};
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dialogPolyfill.reposition = function(element) {
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var scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
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var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2;
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element.style.top = Math.max(scrollTop, topValue) + 'px';
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};
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dialogPolyfill.isInlinePositionSetByStylesheet = function(element) {
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for (var i = 0; i < document.styleSheets.length; ++i) {
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var styleSheet = document.styleSheets[i];
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var cssRules = null;
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// Some browsers throw on cssRules.
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try {
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cssRules = styleSheet.cssRules;
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} catch (e) {}
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if (!cssRules)
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continue;
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for (var j = 0; j < cssRules.length; ++j) {
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var rule = cssRules[j];
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var selectedNodes = null;
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// Ignore errors on invalid selector texts.
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try {
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selectedNodes = document.querySelectorAll(rule.selectorText);
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} catch(e) {}
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if (!selectedNodes || !inNodeList(selectedNodes, element))
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continue;
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var cssTop = rule.style.getPropertyValue('top');
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var cssBottom = rule.style.getPropertyValue('bottom');
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if ((cssTop && cssTop != 'auto') || (cssBottom && cssBottom != 'auto'))
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return true;
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}
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}
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return false;
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};
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dialogPolyfill.needsCentering = function(dialog) {
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var computedStyle = window.getComputedStyle(dialog);
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if (computedStyle.position != 'absolute') {
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return false;
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}
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// We must determine whether the top/bottom specified value is non-auto. In
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// WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but
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// Firefox returns the used value. So we do this crazy thing instead: check
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// the inline style and then go through CSS rules.
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if ((dialog.style.top != 'auto' && dialog.style.top != '') ||
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(dialog.style.bottom != 'auto' && dialog.style.bottom != ''))
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return false;
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return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog);
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};
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/**
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* @param {!Element} element to force upgrade
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*/
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dialogPolyfill.forceRegisterDialog = function(element) {
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if (element.showModal) {
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console.warn('This browser already supports <dialog>, the polyfill ' +
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'may not work correctly', element);
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}
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if (element.nodeName.toUpperCase() != 'DIALOG') {
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throw new Error('Failed to register dialog: The element is not a dialog.');
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}
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new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element));
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};
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/**
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* @param {!Element} element to upgrade
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*/
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dialogPolyfill.registerDialog = function(element) {
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if (element.showModal) {
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console.warn('Can\'t upgrade <dialog>: already supported', element);
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} else {
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dialogPolyfill.forceRegisterDialog(element);
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}
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};
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/**
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* @constructor
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*/
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dialogPolyfill.DialogManager = function() {
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/** @type {!Array<!dialogPolyfillInfo>} */
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this.pendingDialogStack = [];
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// The overlay is used to simulate how a modal dialog blocks the document.
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// The blocking dialog is positioned on top of the overlay, and the rest of
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// the dialogs on the pending dialog stack are positioned below it. In the
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// actual implementation, the modal dialog stacking is controlled by the
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// top layer, where z-index has no effect.
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this.overlay = document.createElement('div');
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this.overlay.className = '_dialog_overlay';
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this.overlay.addEventListener('click', function(e) {
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e.stopPropagation();
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});
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this.handleKey_ = this.handleKey_.bind(this);
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this.handleFocus_ = this.handleFocus_.bind(this);
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this.handleRemove_ = this.handleRemove_.bind(this);
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this.zIndexLow_ = 100000;
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this.zIndexHigh_ = 100000 + 150;
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};
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/**
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* @return {Element} the top HTML dialog element, if any
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*/
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dialogPolyfill.DialogManager.prototype.topDialogElement = function() {
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if (this.pendingDialogStack.length) {
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var t = this.pendingDialogStack[this.pendingDialogStack.length - 1];
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return t.dialog;
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}
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return null;
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};
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/**
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* Called on the first modal dialog being shown. Adds the overlay and related
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* handlers.
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*/
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dialogPolyfill.DialogManager.prototype.blockDocument = function() {
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document.body.appendChild(this.overlay);
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document.body.addEventListener('focus', this.handleFocus_, true);
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document.addEventListener('keydown', this.handleKey_);
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document.addEventListener('DOMNodeRemoved', this.handleRemove_);
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};
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/**
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* Called on the first modal dialog being removed, i.e., when no more modal
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* dialogs are visible.
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*/
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dialogPolyfill.DialogManager.prototype.unblockDocument = function() {
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document.body.removeChild(this.overlay);
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document.body.removeEventListener('focus', this.handleFocus_, true);
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document.removeEventListener('keydown', this.handleKey_);
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document.removeEventListener('DOMNodeRemoved', this.handleRemove_);
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};
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dialogPolyfill.DialogManager.prototype.updateStacking = function() {
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var zIndex = this.zIndexLow_;
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for (var i = 0; i < this.pendingDialogStack.length; i++) {
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if (i == this.pendingDialogStack.length - 1) {
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this.overlay.style.zIndex = zIndex++;
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}
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this.pendingDialogStack[i].updateZIndex(zIndex++, zIndex++);
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}
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};
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dialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) {
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var candidate = findNearestDialog(/** @type {Element} */ (event.target));
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if (candidate != this.topDialogElement()) {
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event.preventDefault();
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event.stopPropagation();
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safeBlur(/** @type {Element} */ (event.target));
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// TODO: Focus on the browser chrome (aka document) or the dialog itself
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// depending on the tab direction.
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return false;
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}
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};
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dialogPolyfill.DialogManager.prototype.handleKey_ = function(event) {
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if (event.keyCode == 27) {
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event.preventDefault();
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event.stopPropagation();
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var cancelEvent = new supportCustomEvent('cancel', {
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bubbles: false,
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cancelable: true
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});
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var dialog = this.topDialogElement();
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if (dialog.dispatchEvent(cancelEvent)) {
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dialog.close();
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}
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}
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};
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dialogPolyfill.DialogManager.prototype.handleRemove_ = function(event) {
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if (event.target.nodeName.toUpperCase() != 'DIALOG') { return; }
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var dialog = /** @type {HTMLDialogElement} */ (event.target);
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if (!dialog.open) { return; }
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// Find a dialogPolyfillInfo which matches the removed <dialog>.
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this.pendingDialogStack.some(function(dpi) {
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if (dpi.dialog == dialog) {
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// This call will clear the dialogPolyfillInfo on this DialogManager
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// as a side effect.
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dpi.maybeHideModal();
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return true;
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}
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});
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};
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/**
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* @param {!dialogPolyfillInfo} dpi
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* @return {boolean} whether the dialog was allowed
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*/
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dialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) {
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var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1;
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if (this.pendingDialogStack.length >= allowed) {
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return false;
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}
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this.pendingDialogStack.push(dpi);
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if (this.pendingDialogStack.length == 1) {
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this.blockDocument();
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}
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this.updateStacking();
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return true;
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};
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/**
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* @param {dialogPolyfillInfo} dpi
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*/
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dialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) {
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var index = this.pendingDialogStack.indexOf(dpi);
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if (index == -1) { return; }
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this.pendingDialogStack.splice(index, 1);
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this.updateStacking();
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if (this.pendingDialogStack.length == 0) {
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this.unblockDocument();
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}
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};
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dialogPolyfill.dm = new dialogPolyfill.DialogManager();
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/**
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* Global form 'dialog' method handler. Closes a dialog correctly on submit
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* and possibly sets its return value.
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*/
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document.addEventListener('submit', function(ev) {
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var target = ev.target;
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if (!target || !target.hasAttribute('method')) { return; }
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if (target.getAttribute('method').toLowerCase() != 'dialog') { return; }
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ev.preventDefault();
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var dialog = findNearestDialog(/** @type {Element} */ (ev.target));
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if (!dialog) { return; }
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// FIXME: The original event doesn't contain the element used to submit the
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// form (if any). Look in some possible places.
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var returnValue;
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var cands = [document.activeElement, ev.explicitOriginalTarget];
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var els = ['BUTTON', 'INPUT'];
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cands.some(function(cand) {
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if (cand && cand.form == ev.target && els.indexOf(cand.nodeName.toUpperCase()) != -1) {
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returnValue = cand.value;
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return true;
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}
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});
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dialog.close(returnValue);
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}, true);
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dialogPolyfill['forceRegisterDialog'] = dialogPolyfill.forceRegisterDialog;
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dialogPolyfill['registerDialog'] = dialogPolyfill.registerDialog;
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if (typeof define === 'function' && 'amd' in define) {
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// AMD support
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define(function() { return dialogPolyfill; });
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} else if (typeof module === 'object' && typeof module['exports'] === 'object') {
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// CommonJS support
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module['exports'] = dialogPolyfill;
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} else {
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// all others
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window['dialogPolyfill'] = dialogPolyfill;
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|
}
|
|
})();
|