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LibWeb: Ensure lazy WindowObject creation when activating event handler

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This commit is contained in:
Linus Groh 2022-03-27 20:12:45 +01:00
parent f9e8f02451
commit 192f4b0258
Notes: sideshowbarker 2024-07-17 16:39:02 +09:00 
Author: https://github.com/linusg
Commit: https://github.com/SerenityOS/serenity/commit/192f4b0258
1 changed files with 8 additions and 5 deletions
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13
Userland/Libraries/LibWeb/DOM/EventTarget.cpp
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@ -519,15 +519,18 @@ void EventTarget::activate_event_handler(FlyString const& name, HTML::EventHandl
// returning the element's document's global object, which is the HTML::Window object.
// For any other HTMLElement who just had an element attribute set, `this` will be that HTMLElement, so the global object is this's document's realm's global object.
// For anything else, it came from JavaScript, so use the global object of the provided callback function.
// Sadly, this doesn't work if an element attribute is set on a <body> element before any script is run, as Window::wrapper() will be null.
JS::GlobalObject* global_object = nullptr;
if (is_attribute == IsAttribute::Yes) {
if (is<HTML::Window>(this)) {
auto* window_global_object = verify_cast<HTML::Window>(this)->wrapper();
global_object = static_cast<JS::GlobalObject*>(window_global_object);
auto& window = verify_cast<HTML::Window>(*this);
// If an element attribute is set on a <body> element before any script is run, Window::wrapper() will be null.
// Force creation of the global object via the Document::interpreter() lazy initialization mechanism.
if (window.wrapper() == nullptr)
window.associated_document().interpreter();
global_object = static_cast<JS::GlobalObject*>(window.wrapper());
} else {
auto* html_element = verify_cast<HTML::HTMLElement>(this);
global_object = &html_element->document().realm().global_object();
auto& html_element = verify_cast<HTML::HTMLElement>(*this);
global_object = &html_element.document().realm().global_object();
}
} else {
global_object = &event_handler.value.get<Bindings::CallbackType>().callback.cell()->global_object();