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function pageScript() {
window.addEventListener("beforeunload", function (event) {
var str = "Some text that causes the beforeunload dialog to be shown";
event.returnValue = str;
return str;
}, true);
}
SpecialPowers.pushPrefEnv({"set": [["dom.require_user_interaction_for_beforeunload", false]]});
const PAGE_URL =
"data:text/html," + encodeURIComponent("<script>(" + pageScript.toSource() + ")();</script>");
add_task(function* enableDialogs() {
// The onbeforeunload dialog should appear.
let dialogShown = false;
function onDialogShown(node) {
dialogShown = true;
let dismissButton = node.ui.button0;
dismissButton.click();
}
let obsName = "tabmodal-dialog-loaded";
Services.obs.addObserver(onDialogShown, obsName, false);
yield openPage(true);
Services.obs.removeObserver(onDialogShown, obsName);
Assert.ok(dialogShown);
});
add_task(function* disableDialogs() {
// The onbeforeunload dialog should NOT appear.
yield openPage(false);
info("If we time out here, then the dialog was shown...");
});
function* openPage(enableDialogs) {
// Open about:blank in a new tab.
yield BrowserTestUtils.withNewTab({ gBrowser, url: "about:blank" }, function* (browser) {
// Load the content script in the frame.
let methodName = enableDialogs ? "enableDialogs" : "disableDialogs";
yield ContentTask.spawn(browser, methodName, function* (name) {
Components.utils.import("resource://gre/modules/Services.jsm");
Services.obs.addObserver(doc => {
if (content && doc == content.document) {
content.QueryInterface(Ci.nsIInterfaceRequestor).
getInterface(Ci.nsIDOMWindowUtils)[name]();
}
}, "document-element-inserted", false);
});
// Load the page.
yield BrowserTestUtils.loadURI(browser, PAGE_URL);
yield BrowserTestUtils.browserLoaded(browser);
// And then navigate away.
yield BrowserTestUtils.loadURI(browser, "http://example.com/");
yield BrowserTestUtils.browserLoaded(browser);
});
}
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