forked from mirrors/gecko-dev
3f0e2f4c4f
Depends on D51054 Summary of the changes here: - move DOMHelpers.jsm to dom-helpers.js - remove all unused methods - converted to a static helper to avoid instanciating DOMHelpers objects for no reason - updated call sites accordingly Differential Revision: https://phabricator.services.mozilla.com/D51065 --HG-- rename : devtools/shared/DOMHelpers.jsm => devtools/shared/dom-helpers.js extra : moz-landing-system : lando
53 lines
1.9 KiB
JavaScript
53 lines
1.9 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const Services = require("Services");
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exports.DOMHelpers = {
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/**
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* A simple way to be notified (once) when a window becomes
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* interactive (DOMContentLoaded).
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*
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* It is based on the chromeEventHandler. This is useful when
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* chrome iframes are loaded in content docshells (in Firefox
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* tabs for example).
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*
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* @param nsIDOMWindow win
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* The content window, owning the document to traverse.
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* @param Function callback
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* The method to call when the frame is loaded.
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* @param String targetURL
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* (optional) Check that the frame URL corresponds to the provided URL
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* before calling the callback.
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*/
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onceDOMReady: function(win, callback, targetURL) {
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if (!win) {
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throw new Error("window can't be null or undefined");
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}
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const docShell = win.docShell;
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const onReady = function(event) {
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if (event.target == win.document) {
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docShell.chromeEventHandler.removeEventListener(
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"DOMContentLoaded",
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onReady
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);
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// If in `callback` the URL of the window is changed and a listener to DOMContentLoaded
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// is attached, the event we just received will be also be caught by the new listener.
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// We want to avoid that so we execute the callback in the next queue.
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Services.tm.dispatchToMainThread(callback);
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}
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};
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if (
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(win.document.readyState == "complete" ||
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win.document.readyState == "interactive") &&
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win.location.href == targetURL
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) {
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Services.tm.dispatchToMainThread(callback);
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} else {
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docShell.chromeEventHandler.addEventListener("DOMContentLoaded", onReady);
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}
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},
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};
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