Project import generated by Copybara.
GitOrigin-RevId: 63746295f1a5ab5a619056791995793d65529e62
diff --git a/node_modules/dialog-polyfill/dist/dialog-polyfill.esm.js b/node_modules/dialog-polyfill/dist/dialog-polyfill.esm.js
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+++ b/node_modules/dialog-polyfill/dist/dialog-polyfill.esm.js
@@ -0,0 +1,728 @@
+// 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);
+}
+
+export default dialogPolyfill;