/* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
"use strict";
exports.DOMHelpers = { /** * A simple way to be notified (once) when a window becomes * interactive (DOMContentLoaded). * * It is based on the chromeEventHandler. This is useful when * chrome iframes are loaded in content docshells (in Firefox * tabs for example). * * @param nsIDOMWindow win * The content window, owning the document to traverse. * @param Function callback * The method to call when the frame is loaded. * @param String targetURL * (optional) Check that the frame URL corresponds to the provided URL * before calling the callback.
*/
onceDOMReady(win, callback, targetURL) { if (!win) { thrownew Error("window can't be null or undefined");
} const docShell = win.docShell; const onReady = function (event) { if (event.target == win.document) {
docShell.chromeEventHandler.removeEventListener( "DOMContentLoaded",
onReady
); // If in `callback` the URL of the window is changed and a listener to DOMContentLoaded // is attached, the event we just received will be also be caught by the new listener. // We want to avoid that so we execute the callback in the next queue.
Services.tm.dispatchToMainThread(callback);
}
}; if (
(win.document.readyState == "complete" ||
win.document.readyState == "interactive") &&
win.location.href == targetURL
) {
Services.tm.dispatchToMainThread(callback);
} else {
docShell.chromeEventHandler.addEventListener("DOMContentLoaded", onReady);
}
},
};
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