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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]],
});
SpecialPowers.pushPrefEnv({
set: [["prompts.contentPromptSubDialog", false]],
});
const PAGE_URL =
"data:text/html," +
encodeURIComponent("<script>(" + pageScript.toSource() + ")();</script>");
add_task(async function enableDialogs() {
// The onbeforeunload dialog should appear.
let dialogShown = false;
function onDialogShown(node) {
dialogShown = true;
let dismissButton = node.querySelector(".tabmodalprompt-button0");
dismissButton.click();
}
let obsName = "tabmodal-dialog-loaded";
Services.obs.addObserver(onDialogShown, obsName);
await openPage(true);
Services.obs.removeObserver(onDialogShown, obsName);
Assert.ok(dialogShown);
});
add_task(async function disableDialogs() {
// The onbeforeunload dialog should NOT appear.
await openPage(false);
info("If we time out here, then the dialog was shown...");
});
async function openPage(enableDialogs) {
// Open about:blank in a new tab.
await BrowserTestUtils.withNewTab(
{ gBrowser, url: "about:blank" },
async function(browser) {
// Load the content script in the frame.
let methodName = enableDialogs ? "enableDialogs" : "disableDialogs";
await SpecialPowers.spawn(browser, [methodName], async function(name) {
const { Services } = ChromeUtils.import(
"resource://gre/modules/Services.jsm"
);
let win = content;
Services.obs.addObserver(doc => {
if (doc == win.document) {
win.windowUtils[name]();
}
}, "document-element-inserted");
});
// Load the page.
BrowserTestUtils.loadURI(browser, PAGE_URL);
await BrowserTestUtils.browserLoaded(browser);
// And then navigate away.
BrowserTestUtils.loadURI(browser, "http://example.com/");
await BrowserTestUtils.browserLoaded(browser);
}
);
}
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