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LibWeb: Check if event is not "beforeunload" before cancelling

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Felipe Muñoz Mazur 2025-01-21 09:55:53 -03:00 • committed by Tim Ledbetter
commit f6c4304e89
Notes: github-actions[bot] 2025-02-03 19:18:56 +00:00
4 changed files with 292 additions and 2 deletions
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10
Libraries/LibWeb/DOM/EventTarget.cpp
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@ -2,6 +2,7 @@
* Copyright (c) 2020-2022, Andreas Kling <andreas@ladybird.org>
* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
* Copyright (c) 2024, Glenn Skrzypczak <glenn.skrzypczak@gmail.com>
* Copyright (c) 2025, Felipe Muñoz Mazur <felipe.munoz.mazur@protonmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -716,8 +717,10 @@ JS::ThrowCompletionOr<void> EventTarget::process_event_handler_for_event(FlyStri
// FIXME: Ideally, invoke_callback would convert JS::Value to the appropriate return type for us as per the spec, but it doesn't currently.
auto return_value = *return_value_or_error.value();
auto is_beforeunload = event.type() == HTML::EventNames::beforeunload;
// 5. Process return value as follows:
if (is<HTML::BeforeUnloadEvent>(event) && event.type() == "beforeunload") {
if (is<HTML::BeforeUnloadEvent>(event) && is_beforeunload) {
// -> If event is a BeforeUnloadEvent object and event's type is "beforeunload"
// If return value is not null, then:
if (!return_value.is_nullish()) {
@ -741,7 +744,10 @@ JS::ThrowCompletionOr<void> EventTarget::process_event_handler_for_event(FlyStri
// -> Otherwise
// If return value is false, then set event's canceled flag.
// NOTE: the return type of EventHandler is `any`, so no coercion happens, meaning we have to check if it's a boolean first.
if (return_value.is_boolean() && !return_value.as_bool())
// Spec-Note: If we've gotten to this "Otherwise" clause because event's type is "beforeunload" but event is
// not a BeforeUnloadEvent object, then return value will never be false, since in such cases
// return value will have been coerced into either null or a DOMString.
if (return_value.is_boolean() && !return_value.as_bool() && !is_beforeunload)
event.set_cancelled(true);
}