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LibWeb: Fire "load" and "error" events for rel=preload link loads

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This commit is contained in:
Andreas Kling 2023-06-06 07:03:30 +02:00
parent 3cea86632d
commit b97004ea4a
Notes: sideshowbarker 2024-07-19 01:59:31 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/b97004ea4a
Pull-request: https://github.com/SerenityOS/serenity/pull/19275
Reviewed-by: https://github.com/gmta ✅
5 changed files with 34 additions and 5 deletions
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2
Tests/LibWeb/Text/expected/link-element-rel-preload-load-event.txt Normal file
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@ -0,0 +1,2 @@
Got load event
Got error event

20
Tests/LibWeb/Text/input/link-element-rel-preload-load-event.html Normal file
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@ -0,0 +1,20 @@
<script src="include.js"></script>
<script>
let goodLink = document.createElement("link");
goodLink.setAttribute("rel", "preload");
goodLink.setAttribute("href", "valid.css");
goodLink.setAttribute("as", "style");
goodLink.addEventListener("load", function() {
println("Got load event");
});
document.head.appendChild(goodLink);
let badLink = document.createElement("link");
badLink.setAttribute("rel", "preload");
badLink.setAttribute("href", "this-file-does-not-exist-and-so-is-invalid.css");
badLink.setAttribute("as", "style");
badLink.addEventListener("error", function() {
println("Got error event");
});
document.head.appendChild(badLink);
</script>

1
Tests/LibWeb/Text/input/valid.css Normal file
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@ -0,0 +1 @@
* { }

13
Userland/Libraries/LibWeb/HTML/HTMLLinkElement.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, Srikavin Ramkumar <me@srikavin.me>
@ -60,7 +60,7 @@ void HTMLLinkElement::inserted()
// FIXME: Respect the "as" attribute.
LoadRequest request;
request.set_url(document().parse_url(attribute(HTML::AttributeNames::href)));
m_preload_resource = ResourceLoader::the().load_resource(Resource::Type::Generic, request);
set_resource(ResourceLoader::the().load_resource(Resource::Type::Generic, request));
} else if (m_relationship & Relationship::DNSPrefetch) {
ResourceLoader::the().prefetch_dns(document().parse_url(attribute(HTML::AttributeNames::href)));
} else if (m_relationship & Relationship::Preconnect) {
@ -111,6 +111,8 @@ void HTMLLinkElement::parse_attribute(DeprecatedFlyString const& name, Deprecate
// https://html.spec.whatwg.org/multipage/links.html#link-type-stylesheet:fetch-and-process-the-linked-resource
// The appropriate times to fetch and process this type of link are:
if (
// AD-HOC: When the rel attribute changes
name == AttributeNames::rel ||
// - When the href attribute of the link element of an external resource link that is already browsing-context connected is changed.
name == AttributeNames::href ||
// - When the disabled attribute of the link element of an external resource link that is already browsing-context connected is set, changed, or removed.
@ -128,16 +130,21 @@ void HTMLLinkElement::parse_attribute(DeprecatedFlyString const& name, Deprecate
void HTMLLinkElement::resource_did_fail()
{
dbgln_if(CSS_LOADER_DEBUG, "HTMLLinkElement: Resource did fail. URL: {}", resource()->url());
if (m_relationship & Relationship::Preload) {
dispatch_event(*DOM::Event::create(realm(), HTML::EventNames::error).release_value_but_fixme_should_propagate_errors());
}
}
void HTMLLinkElement::resource_did_load()
{
VERIFY(resource());
VERIFY(m_relationship & (Relationship::Icon));
if (m_relationship & Relationship::Icon) {
resource_did_load_favicon();
m_document_load_event_delayer.clear();
}
if (m_relationship & Relationship::Preload) {
dispatch_event(*DOM::Event::create(realm(), HTML::EventNames::load).release_value_but_fixme_should_propagate_errors());
}
}
void HTMLLinkElement::did_remove_attribute(DeprecatedFlyString const& attr)

3
Userland/Libraries/LibWeb/HTML/HTMLLinkElement.h
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2023, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, the SerenityOS developers.
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2023, Srikavin Ramkumar <me@srikavin.me>
@ -127,7 +127,6 @@ private:
};
};
RefPtr<Resource> m_preload_resource;
JS::GCPtr<CSS::CSSStyleSheet> m_loaded_style_sheet;
Optional<DOM::DocumentLoadEventDelayer> m_document_load_event_delayer;