| (function (global, factory) { |
| typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() : |
| typeof define === 'function' && define.amd ? define(factory) : |
| (global = global || self, global.dialogPolyfill = factory()); |
| }(this, function () { 'use strict'; |
| |
| // nb. This is for IE10 and lower _only_. |
| var supportCustomEvent = window.CustomEvent; |
| if (!supportCustomEvent || typeof supportCustomEvent === 'object') { |
| supportCustomEvent = function CustomEvent(event, x) { |
| x = x || {}; |
| var ev = document.createEvent('CustomEvent'); |
| ev.initCustomEvent(event, !!x.bubbles, !!x.cancelable, x.detail || null); |
| return ev; |
| }; |
| supportCustomEvent.prototype = window.Event.prototype; |
| } |
| |
| /** |
| * @param {Element} el to check for stacking context |
| * @return {boolean} whether this el or its parents creates a stacking context |
| */ |
| function createsStackingContext(el) { |
| while (el && el !== document.body) { |
| var s = window.getComputedStyle(el); |
| var invalid = function(k, ok) { |
| return !(s[k] === undefined || s[k] === ok); |
| }; |
| |
| if (s.opacity < 1 || |
| invalid('zIndex', 'auto') || |
| invalid('transform', 'none') || |
| invalid('mixBlendMode', 'normal') || |
| invalid('filter', 'none') || |
| invalid('perspective', 'none') || |
| s['isolation'] === 'isolate' || |
| s.position === 'fixed' || |
| s.webkitOverflowScrolling === 'touch') { |
| return true; |
| } |
| el = el.parentElement; |
| } |
| return false; |
| } |
| |
| /** |
| * Finds the nearest <dialog> from the passed element. |
| * |
| * @param {Element} el to search from |
| * @return {HTMLDialogElement} dialog found |
| */ |
| function findNearestDialog(el) { |
| while (el) { |
| if (el.localName === 'dialog') { |
| return /** @type {HTMLDialogElement} */ (el); |
| } |
| el = el.parentElement; |
| } |
| return null; |
| } |
| |
| /** |
| * Blur the specified element, as long as it's not the HTML body element. |
| * This works around an IE9/10 bug - blurring the body causes Windows to |
| * blur the whole application. |
| * |
| * @param {Element} el to blur |
| */ |
| function safeBlur(el) { |
| if (el && el.blur && el !== document.body) { |
| el.blur(); |
| } |
| } |
| |
| /** |
| * @param {!NodeList} nodeList to search |
| * @param {Node} node to find |
| * @return {boolean} whether node is inside nodeList |
| */ |
| function inNodeList(nodeList, node) { |
| for (var i = 0; i < nodeList.length; ++i) { |
| if (nodeList[i] === node) { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * @param {HTMLFormElement} el to check |
| * @return {boolean} whether this form has method="dialog" |
| */ |
| function isFormMethodDialog(el) { |
| if (!el || !el.hasAttribute('method')) { |
| return false; |
| } |
| return el.getAttribute('method').toLowerCase() === 'dialog'; |
| } |
| |
| /** |
| * @param {!HTMLDialogElement} dialog to upgrade |
| * @constructor |
| */ |
| function dialogPolyfillInfo(dialog) { |
| this.dialog_ = dialog; |
| this.replacedStyleTop_ = false; |
| this.openAsModal_ = false; |
| |
| // Set a11y role. Browsers that support dialog implicitly know this already. |
| if (!dialog.hasAttribute('role')) { |
| dialog.setAttribute('role', 'dialog'); |
| } |
| |
| dialog.show = this.show.bind(this); |
| dialog.showModal = this.showModal.bind(this); |
| dialog.close = this.close.bind(this); |
| |
| if (!('returnValue' in dialog)) { |
| dialog.returnValue = ''; |
| } |
| |
| if ('MutationObserver' in window) { |
| var mo = new MutationObserver(this.maybeHideModal.bind(this)); |
| mo.observe(dialog, {attributes: true, attributeFilter: ['open']}); |
| } else { |
| // IE10 and below support. Note that DOMNodeRemoved etc fire _before_ removal. They also |
| // seem to fire even if the element was removed as part of a parent removal. Use the removed |
| // events to force downgrade (useful if removed/immediately added). |
| var removed = false; |
| var cb = function() { |
| removed ? this.downgradeModal() : this.maybeHideModal(); |
| removed = false; |
| }.bind(this); |
| var timeout; |
| var delayModel = function(ev) { |
| if (ev.target !== dialog) { return; } // not for a child element |
| var cand = 'DOMNodeRemoved'; |
| removed |= (ev.type.substr(0, cand.length) === cand); |
| window.clearTimeout(timeout); |
| timeout = window.setTimeout(cb, 0); |
| }; |
| ['DOMAttrModified', 'DOMNodeRemoved', 'DOMNodeRemovedFromDocument'].forEach(function(name) { |
| dialog.addEventListener(name, delayModel); |
| }); |
| } |
| // Note that the DOM is observed inside DialogManager while any dialog |
| // is being displayed as a modal, to catch modal removal from the DOM. |
| |
| Object.defineProperty(dialog, 'open', { |
| set: this.setOpen.bind(this), |
| get: dialog.hasAttribute.bind(dialog, 'open') |
| }); |
| |
| this.backdrop_ = document.createElement('div'); |
| this.backdrop_.className = 'backdrop'; |
| this.backdrop_.addEventListener('click', this.backdropClick_.bind(this)); |
| } |
| |
| dialogPolyfillInfo.prototype = { |
| |
| get dialog() { |
| return this.dialog_; |
| }, |
| |
| /** |
| * Maybe remove this dialog from the modal top layer. This is called when |
| * a modal dialog may no longer be tenable, e.g., when the dialog is no |
| * longer open or is no longer part of the DOM. |
| */ |
| maybeHideModal: function() { |
| if (this.dialog_.hasAttribute('open') && document.body.contains(this.dialog_)) { return; } |
| this.downgradeModal(); |
| }, |
| |
| /** |
| * Remove this dialog from the modal top layer, leaving it as a non-modal. |
| */ |
| downgradeModal: function() { |
| if (!this.openAsModal_) { return; } |
| this.openAsModal_ = false; |
| this.dialog_.style.zIndex = ''; |
| |
| // This won't match the native <dialog> exactly because if the user set top on a centered |
| // polyfill dialog, that top gets thrown away when the dialog is closed. Not sure it's |
| // possible to polyfill this perfectly. |
| if (this.replacedStyleTop_) { |
| this.dialog_.style.top = ''; |
| this.replacedStyleTop_ = false; |
| } |
| |
| // Clear the backdrop and remove from the manager. |
| this.backdrop_.parentNode && this.backdrop_.parentNode.removeChild(this.backdrop_); |
| dialogPolyfill.dm.removeDialog(this); |
| }, |
| |
| /** |
| * @param {boolean} value whether to open or close this dialog |
| */ |
| setOpen: function(value) { |
| if (value) { |
| this.dialog_.hasAttribute('open') || this.dialog_.setAttribute('open', ''); |
| } else { |
| this.dialog_.removeAttribute('open'); |
| this.maybeHideModal(); // nb. redundant with MutationObserver |
| } |
| }, |
| |
| /** |
| * Handles clicks on the fake .backdrop element, redirecting them as if |
| * they were on the dialog itself. |
| * |
| * @param {!Event} e to redirect |
| */ |
| backdropClick_: function(e) { |
| if (!this.dialog_.hasAttribute('tabindex')) { |
| // Clicking on the backdrop should move the implicit cursor, even if dialog cannot be |
| // focused. Create a fake thing to focus on. If the backdrop was _before_ the dialog, this |
| // would not be needed - clicks would move the implicit cursor there. |
| var fake = document.createElement('div'); |
| this.dialog_.insertBefore(fake, this.dialog_.firstChild); |
| fake.tabIndex = -1; |
| fake.focus(); |
| this.dialog_.removeChild(fake); |
| } else { |
| this.dialog_.focus(); |
| } |
| |
| var redirectedEvent = document.createEvent('MouseEvents'); |
| redirectedEvent.initMouseEvent(e.type, e.bubbles, e.cancelable, window, |
| e.detail, e.screenX, e.screenY, e.clientX, e.clientY, e.ctrlKey, |
| e.altKey, e.shiftKey, e.metaKey, e.button, e.relatedTarget); |
| this.dialog_.dispatchEvent(redirectedEvent); |
| e.stopPropagation(); |
| }, |
| |
| /** |
| * Focuses on the first focusable element within the dialog. This will always blur the current |
| * focus, even if nothing within the dialog is found. |
| */ |
| focus_: function() { |
| // Find element with `autofocus` attribute, or fall back to the first form/tabindex control. |
| var target = this.dialog_.querySelector('[autofocus]:not([disabled])'); |
| if (!target && this.dialog_.tabIndex >= 0) { |
| target = this.dialog_; |
| } |
| if (!target) { |
| // Note that this is 'any focusable area'. This list is probably not exhaustive, but the |
| // alternative involves stepping through and trying to focus everything. |
| var opts = ['button', 'input', 'keygen', 'select', 'textarea']; |
| var query = opts.map(function(el) { |
| return el + ':not([disabled])'; |
| }); |
| // TODO(samthor): tabindex values that are not numeric are not focusable. |
| query.push('[tabindex]:not([disabled]):not([tabindex=""])'); // tabindex != "", not disabled |
| target = this.dialog_.querySelector(query.join(', ')); |
| } |
| safeBlur(document.activeElement); |
| target && target.focus(); |
| }, |
| |
| /** |
| * Sets the zIndex for the backdrop and dialog. |
| * |
| * @param {number} dialogZ |
| * @param {number} backdropZ |
| */ |
| updateZIndex: function(dialogZ, backdropZ) { |
| if (dialogZ < backdropZ) { |
| throw new Error('dialogZ should never be < backdropZ'); |
| } |
| this.dialog_.style.zIndex = dialogZ; |
| this.backdrop_.style.zIndex = backdropZ; |
| }, |
| |
| /** |
| * Shows the dialog. If the dialog is already open, this does nothing. |
| */ |
| show: function() { |
| if (!this.dialog_.open) { |
| this.setOpen(true); |
| this.focus_(); |
| } |
| }, |
| |
| /** |
| * Show this dialog modally. |
| */ |
| showModal: function() { |
| if (this.dialog_.hasAttribute('open')) { |
| throw new Error('Failed to execute \'showModal\' on dialog: The element is already open, and therefore cannot be opened modally.'); |
| } |
| if (!document.body.contains(this.dialog_)) { |
| throw new Error('Failed to execute \'showModal\' on dialog: The element is not in a Document.'); |
| } |
| if (!dialogPolyfill.dm.pushDialog(this)) { |
| throw new Error('Failed to execute \'showModal\' on dialog: There are too many open modal dialogs.'); |
| } |
| |
| if (createsStackingContext(this.dialog_.parentElement)) { |
| console.warn('A dialog is being shown inside a stacking context. ' + |
| 'This may cause it to be unusable. For more information, see this link: ' + |
| 'https://github.com/GoogleChrome/dialog-polyfill/#stacking-context'); |
| } |
| |
| this.setOpen(true); |
| this.openAsModal_ = true; |
| |
| // Optionally center vertically, relative to the current viewport. |
| if (dialogPolyfill.needsCentering(this.dialog_)) { |
| dialogPolyfill.reposition(this.dialog_); |
| this.replacedStyleTop_ = true; |
| } else { |
| this.replacedStyleTop_ = false; |
| } |
| |
| // Insert backdrop. |
| this.dialog_.parentNode.insertBefore(this.backdrop_, this.dialog_.nextSibling); |
| |
| // Focus on whatever inside the dialog. |
| this.focus_(); |
| }, |
| |
| /** |
| * Closes this HTMLDialogElement. This is optional vs clearing the open |
| * attribute, however this fires a 'close' event. |
| * |
| * @param {string=} opt_returnValue to use as the returnValue |
| */ |
| close: function(opt_returnValue) { |
| if (!this.dialog_.hasAttribute('open')) { |
| throw new Error('Failed to execute \'close\' on dialog: The element does not have an \'open\' attribute, and therefore cannot be closed.'); |
| } |
| this.setOpen(false); |
| |
| // Leave returnValue untouched in case it was set directly on the element |
| if (opt_returnValue !== undefined) { |
| this.dialog_.returnValue = opt_returnValue; |
| } |
| |
| // Triggering "close" event for any attached listeners on the <dialog>. |
| var closeEvent = new supportCustomEvent('close', { |
| bubbles: false, |
| cancelable: false |
| }); |
| this.dialog_.dispatchEvent(closeEvent); |
| } |
| |
| }; |
| |
| var dialogPolyfill = {}; |
| |
| dialogPolyfill.reposition = function(element) { |
| var scrollTop = document.body.scrollTop || document.documentElement.scrollTop; |
| var topValue = scrollTop + (window.innerHeight - element.offsetHeight) / 2; |
| element.style.top = Math.max(scrollTop, topValue) + 'px'; |
| }; |
| |
| dialogPolyfill.isInlinePositionSetByStylesheet = function(element) { |
| for (var i = 0; i < document.styleSheets.length; ++i) { |
| var styleSheet = document.styleSheets[i]; |
| var cssRules = null; |
| // Some browsers throw on cssRules. |
| try { |
| cssRules = styleSheet.cssRules; |
| } catch (e) {} |
| if (!cssRules) { continue; } |
| for (var j = 0; j < cssRules.length; ++j) { |
| var rule = cssRules[j]; |
| var selectedNodes = null; |
| // Ignore errors on invalid selector texts. |
| try { |
| selectedNodes = document.querySelectorAll(rule.selectorText); |
| } catch(e) {} |
| if (!selectedNodes || !inNodeList(selectedNodes, element)) { |
| continue; |
| } |
| var cssTop = rule.style.getPropertyValue('top'); |
| var cssBottom = rule.style.getPropertyValue('bottom'); |
| if ((cssTop && cssTop !== 'auto') || (cssBottom && cssBottom !== 'auto')) { |
| return true; |
| } |
| } |
| } |
| return false; |
| }; |
| |
| dialogPolyfill.needsCentering = function(dialog) { |
| var computedStyle = window.getComputedStyle(dialog); |
| if (computedStyle.position !== 'absolute') { |
| return false; |
| } |
| |
| // We must determine whether the top/bottom specified value is non-auto. In |
| // WebKit/Blink, checking computedStyle.top == 'auto' is sufficient, but |
| // Firefox returns the used value. So we do this crazy thing instead: check |
| // the inline style and then go through CSS rules. |
| if ((dialog.style.top !== 'auto' && dialog.style.top !== '') || |
| (dialog.style.bottom !== 'auto' && dialog.style.bottom !== '')) { |
| return false; |
| } |
| return !dialogPolyfill.isInlinePositionSetByStylesheet(dialog); |
| }; |
| |
| /** |
| * @param {!Element} element to force upgrade |
| */ |
| dialogPolyfill.forceRegisterDialog = function(element) { |
| if (window.HTMLDialogElement || element.showModal) { |
| console.warn('This browser already supports <dialog>, the polyfill ' + |
| 'may not work correctly', element); |
| } |
| if (element.localName !== 'dialog') { |
| throw new Error('Failed to register dialog: The element is not a dialog.'); |
| } |
| new dialogPolyfillInfo(/** @type {!HTMLDialogElement} */ (element)); |
| }; |
| |
| /** |
| * @param {!Element} element to upgrade, if necessary |
| */ |
| dialogPolyfill.registerDialog = function(element) { |
| if (!element.showModal) { |
| dialogPolyfill.forceRegisterDialog(element); |
| } |
| }; |
| |
| /** |
| * @constructor |
| */ |
| dialogPolyfill.DialogManager = function() { |
| /** @type {!Array<!dialogPolyfillInfo>} */ |
| this.pendingDialogStack = []; |
| |
| var checkDOM = this.checkDOM_.bind(this); |
| |
| // The overlay is used to simulate how a modal dialog blocks the document. |
| // The blocking dialog is positioned on top of the overlay, and the rest of |
| // the dialogs on the pending dialog stack are positioned below it. In the |
| // actual implementation, the modal dialog stacking is controlled by the |
| // top layer, where z-index has no effect. |
| this.overlay = document.createElement('div'); |
| this.overlay.className = '_dialog_overlay'; |
| this.overlay.addEventListener('click', function(e) { |
| this.forwardTab_ = undefined; |
| e.stopPropagation(); |
| checkDOM([]); // sanity-check DOM |
| }.bind(this)); |
| |
| this.handleKey_ = this.handleKey_.bind(this); |
| this.handleFocus_ = this.handleFocus_.bind(this); |
| |
| this.zIndexLow_ = 100000; |
| this.zIndexHigh_ = 100000 + 150; |
| |
| this.forwardTab_ = undefined; |
| |
| if ('MutationObserver' in window) { |
| this.mo_ = new MutationObserver(function(records) { |
| var removed = []; |
| records.forEach(function(rec) { |
| for (var i = 0, c; c = rec.removedNodes[i]; ++i) { |
| if (!(c instanceof Element)) { |
| continue; |
| } else if (c.localName === 'dialog') { |
| removed.push(c); |
| } |
| removed = removed.concat(c.querySelectorAll('dialog')); |
| } |
| }); |
| removed.length && checkDOM(removed); |
| }); |
| } |
| }; |
| |
| /** |
| * Called on the first modal dialog being shown. Adds the overlay and related |
| * handlers. |
| */ |
| dialogPolyfill.DialogManager.prototype.blockDocument = function() { |
| document.documentElement.addEventListener('focus', this.handleFocus_, true); |
| document.addEventListener('keydown', this.handleKey_); |
| this.mo_ && this.mo_.observe(document, {childList: true, subtree: true}); |
| }; |
| |
| /** |
| * Called on the first modal dialog being removed, i.e., when no more modal |
| * dialogs are visible. |
| */ |
| dialogPolyfill.DialogManager.prototype.unblockDocument = function() { |
| document.documentElement.removeEventListener('focus', this.handleFocus_, true); |
| document.removeEventListener('keydown', this.handleKey_); |
| this.mo_ && this.mo_.disconnect(); |
| }; |
| |
| /** |
| * Updates the stacking of all known dialogs. |
| */ |
| dialogPolyfill.DialogManager.prototype.updateStacking = function() { |
| var zIndex = this.zIndexHigh_; |
| |
| for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) { |
| dpi.updateZIndex(--zIndex, --zIndex); |
| if (i === 0) { |
| this.overlay.style.zIndex = --zIndex; |
| } |
| } |
| |
| // Make the overlay a sibling of the dialog itself. |
| var last = this.pendingDialogStack[0]; |
| if (last) { |
| var p = last.dialog.parentNode || document.body; |
| p.appendChild(this.overlay); |
| } else if (this.overlay.parentNode) { |
| this.overlay.parentNode.removeChild(this.overlay); |
| } |
| }; |
| |
| /** |
| * @param {Element} candidate to check if contained or is the top-most modal dialog |
| * @return {boolean} whether candidate is contained in top dialog |
| */ |
| dialogPolyfill.DialogManager.prototype.containedByTopDialog_ = function(candidate) { |
| while (candidate = findNearestDialog(candidate)) { |
| for (var i = 0, dpi; dpi = this.pendingDialogStack[i]; ++i) { |
| if (dpi.dialog === candidate) { |
| return i === 0; // only valid if top-most |
| } |
| } |
| candidate = candidate.parentElement; |
| } |
| return false; |
| }; |
| |
| dialogPolyfill.DialogManager.prototype.handleFocus_ = function(event) { |
| if (this.containedByTopDialog_(event.target)) { return; } |
| |
| if (document.activeElement === document.documentElement) { return; } |
| |
| event.preventDefault(); |
| event.stopPropagation(); |
| safeBlur(/** @type {Element} */ (event.target)); |
| |
| if (this.forwardTab_ === undefined) { return; } // move focus only from a tab key |
| |
| var dpi = this.pendingDialogStack[0]; |
| var dialog = dpi.dialog; |
| var position = dialog.compareDocumentPosition(event.target); |
| if (position & Node.DOCUMENT_POSITION_PRECEDING) { |
| if (this.forwardTab_) { |
| // forward |
| dpi.focus_(); |
| } else if (event.target !== document.documentElement) { |
| // backwards if we're not already focused on <html> |
| document.documentElement.focus(); |
| } |
| } |
| |
| return false; |
| }; |
| |
| dialogPolyfill.DialogManager.prototype.handleKey_ = function(event) { |
| this.forwardTab_ = undefined; |
| if (event.keyCode === 27) { |
| event.preventDefault(); |
| event.stopPropagation(); |
| var cancelEvent = new supportCustomEvent('cancel', { |
| bubbles: false, |
| cancelable: true |
| }); |
| var dpi = this.pendingDialogStack[0]; |
| if (dpi && dpi.dialog.dispatchEvent(cancelEvent)) { |
| dpi.dialog.close(); |
| } |
| } else if (event.keyCode === 9) { |
| this.forwardTab_ = !event.shiftKey; |
| } |
| }; |
| |
| /** |
| * Finds and downgrades any known modal dialogs that are no longer displayed. Dialogs that are |
| * removed and immediately readded don't stay modal, they become normal. |
| * |
| * @param {!Array<!HTMLDialogElement>} removed that have definitely been removed |
| */ |
| dialogPolyfill.DialogManager.prototype.checkDOM_ = function(removed) { |
| // This operates on a clone because it may cause it to change. Each change also calls |
| // updateStacking, which only actually needs to happen once. But who removes many modal dialogs |
| // at a time?! |
| var clone = this.pendingDialogStack.slice(); |
| clone.forEach(function(dpi) { |
| if (removed.indexOf(dpi.dialog) !== -1) { |
| dpi.downgradeModal(); |
| } else { |
| dpi.maybeHideModal(); |
| } |
| }); |
| }; |
| |
| /** |
| * @param {!dialogPolyfillInfo} dpi |
| * @return {boolean} whether the dialog was allowed |
| */ |
| dialogPolyfill.DialogManager.prototype.pushDialog = function(dpi) { |
| var allowed = (this.zIndexHigh_ - this.zIndexLow_) / 2 - 1; |
| if (this.pendingDialogStack.length >= allowed) { |
| return false; |
| } |
| if (this.pendingDialogStack.unshift(dpi) === 1) { |
| this.blockDocument(); |
| } |
| this.updateStacking(); |
| return true; |
| }; |
| |
| /** |
| * @param {!dialogPolyfillInfo} dpi |
| */ |
| dialogPolyfill.DialogManager.prototype.removeDialog = function(dpi) { |
| var index = this.pendingDialogStack.indexOf(dpi); |
| if (index === -1) { return; } |
| |
| this.pendingDialogStack.splice(index, 1); |
| if (this.pendingDialogStack.length === 0) { |
| this.unblockDocument(); |
| } |
| this.updateStacking(); |
| }; |
| |
| dialogPolyfill.dm = new dialogPolyfill.DialogManager(); |
| dialogPolyfill.formSubmitter = null; |
| dialogPolyfill.useValue = null; |
| |
| /** |
| * Installs global handlers, such as click listers and native method overrides. These are needed |
| * even if a no dialog is registered, as they deal with <form method="dialog">. |
| */ |
| if (window.HTMLDialogElement === undefined) { |
| |
| /** |
| * If HTMLFormElement translates method="DIALOG" into 'get', then replace the descriptor with |
| * one that returns the correct value. |
| */ |
| var testForm = document.createElement('form'); |
| testForm.setAttribute('method', 'dialog'); |
| if (testForm.method !== 'dialog') { |
| var methodDescriptor = Object.getOwnPropertyDescriptor(HTMLFormElement.prototype, 'method'); |
| if (methodDescriptor) { |
| // nb. Some older iOS and older PhantomJS fail to return the descriptor. Don't do anything |
| // and don't bother to update the element. |
| var realGet = methodDescriptor.get; |
| methodDescriptor.get = function() { |
| if (isFormMethodDialog(this)) { |
| return 'dialog'; |
| } |
| return realGet.call(this); |
| }; |
| var realSet = methodDescriptor.set; |
| methodDescriptor.set = function(v) { |
| if (typeof v === 'string' && v.toLowerCase() === 'dialog') { |
| return this.setAttribute('method', v); |
| } |
| return realSet.call(this, v); |
| }; |
| Object.defineProperty(HTMLFormElement.prototype, 'method', methodDescriptor); |
| } |
| } |
| |
| /** |
| * Global 'click' handler, to capture the <input type="submit"> or <button> element which has |
| * submitted a <form method="dialog">. Needed as Safari and others don't report this inside |
| * document.activeElement. |
| */ |
| document.addEventListener('click', function(ev) { |
| dialogPolyfill.formSubmitter = null; |
| dialogPolyfill.useValue = null; |
| if (ev.defaultPrevented) { return; } // e.g. a submit which prevents default submission |
| |
| var target = /** @type {Element} */ (ev.target); |
| if (!target || !isFormMethodDialog(target.form)) { return; } |
| |
| var valid = (target.type === 'submit' && ['button', 'input'].indexOf(target.localName) > -1); |
| if (!valid) { |
| if (!(target.localName === 'input' && target.type === 'image')) { return; } |
| // this is a <input type="image">, which can submit forms |
| dialogPolyfill.useValue = ev.offsetX + ',' + ev.offsetY; |
| } |
| |
| var dialog = findNearestDialog(target); |
| if (!dialog) { return; } |
| |
| dialogPolyfill.formSubmitter = target; |
| |
| }, false); |
| |
| /** |
| * Replace the native HTMLFormElement.submit() method, as it won't fire the |
| * submit event and give us a chance to respond. |
| */ |
| var nativeFormSubmit = HTMLFormElement.prototype.submit; |
| var replacementFormSubmit = function () { |
| if (!isFormMethodDialog(this)) { |
| return nativeFormSubmit.call(this); |
| } |
| var dialog = findNearestDialog(this); |
| dialog && dialog.close(); |
| }; |
| HTMLFormElement.prototype.submit = replacementFormSubmit; |
| |
| /** |
| * Global form 'dialog' method handler. Closes a dialog correctly on submit |
| * and possibly sets its return value. |
| */ |
| document.addEventListener('submit', function(ev) { |
| var form = /** @type {HTMLFormElement} */ (ev.target); |
| if (!isFormMethodDialog(form)) { return; } |
| ev.preventDefault(); |
| |
| var dialog = findNearestDialog(form); |
| if (!dialog) { return; } |
| |
| // Forms can only be submitted via .submit() or a click (?), but anyway: sanity-check that |
| // the submitter is correct before using its value as .returnValue. |
| var s = dialogPolyfill.formSubmitter; |
| if (s && s.form === form) { |
| dialog.close(dialogPolyfill.useValue || s.value); |
| } else { |
| dialog.close(); |
| } |
| dialogPolyfill.formSubmitter = null; |
| |
| }, true); |
| } |
| |
| return dialogPolyfill; |
| |
| })); |