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LibWeb: Implement the HTMLLabelElement.form attribute

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This returns the form element associated with the given label element's
control or null if the label has no control.
This commit is contained in:
Tim Ledbetter 2024-05-17 06:05:39 +01:00 committed by Andreas Kling
parent 5296338e7a
commit 6bf22075ed
Notes: sideshowbarker 2024-07-17 00:49:59 +09:00 
Author: https://github.com/tcl3
Commit: https://github.com/SerenityOS/serenity/commit/6bf22075ed
Pull-request: https://github.com/SerenityOS/serenity/pull/24346
Reviewed-by: https://github.com/shannonbooth ✅
5 changed files with 60 additions and 1 deletions
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12
Tests/LibWeb/Text/expected/HTML/HTMLLabelElement-form.txt Normal file
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@ -0,0 +1,12 @@
Form for #label-no-for is null
Control for #label-no-for is null: true
Form for #parent-of-input2: #form2
label.form is the same as label.control.form for #parent-of-input2: true
Form for #label-for-input2: #form2
label.form is the same as label.control.form for #label-for-input2: true
Form for #label-for-input1: #form1
label.form is the same as label.control.form for #label-for-input1: true
Form for #label-for-non-labelable-element is null
Control for #label-for-non-labelable-element is null: true
Form for #label-for-nonexistent-element is null
Control for #label-for-nonexistent-element is null: true

28
Tests/LibWeb/Text/input/HTML/HTMLLabelElement-form.html Normal file
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@ -0,0 +1,28 @@
<!DOCTYPE html>
<label id="label-no-for"></label>
<span id="non-labelable"></span>
<form id="form1">
<input id="input1">
</form>
<form id="form2">
<label id="parent-of-input2"><input id="input2" ></label>
<label id="label-for-input2" for="input2"></label>
<label id="label-for-input1" for="input1"></label>
<label id="label-for-non-labelable-element" for="non-labelable"></label>
<label id="label-for-nonexistent-element" for="invalid"></label>
</form>
</form>
<script src="../include.js"></script>
<script>
test(() => {
for (const labelElement of document.querySelectorAll("label")) {
if (labelElement.form) {
println(`Form for #${labelElement.id}: #${labelElement.form.id}`);
println(`label.form is the same as label.control.form for #${labelElement.id}: ${labelElement.form === labelElement.control.form}`);
} else {
println(`Form for #${labelElement.id} is null`);
println(`Control for #${labelElement.id} is null: ${labelElement.control === null}`);
}
}
});
</script>

18
Userland/Libraries/LibWeb/HTML/HTMLLabelElement.cpp
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@ -6,6 +6,7 @@
#include <LibWeb/Bindings/HTMLLabelElementPrototype.h>
#include <LibWeb/DOM/Document.h>
#include <LibWeb/HTML/FormAssociatedElement.h>
#include <LibWeb/HTML/HTMLLabelElement.h>
#include <LibWeb/Layout/Label.h>
@ -66,4 +67,21 @@ JS::GCPtr<HTMLElement> HTMLLabelElement::control() const
return control;
}
// https://html.spec.whatwg.org/multipage/forms.html#dom-label-form
JS::GCPtr<HTMLFormElement> HTMLLabelElement::form() const
{
auto labeled_control = control();
// 1. If the label element has no labeled control, then return null.
if (!labeled_control)
return {};
// 2. If the label element's labeled control is not a form-associated element, then return null.
if (!is<FormAssociatedElement>(*labeled_control))
return {};
// 3. Return the label element's labeled control's form owner (which can still be null).
return dynamic_cast<FormAssociatedElement*>(labeled_control.ptr())->form();
}
}

1
Userland/Libraries/LibWeb/HTML/HTMLLabelElement.h
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@ -22,6 +22,7 @@ public:
Optional<String> for_() const { return attribute(HTML::AttributeNames::for_); }
JS::GCPtr<HTMLElement> control() const;
JS::GCPtr<HTMLFormElement> form() const;
private:
HTMLLabelElement(DOM::Document&, DOM::QualifiedName);

2
Userland/Libraries/LibWeb/HTML/HTMLLabelElement.idl
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@ -6,7 +6,7 @@ interface HTMLLabelElement : HTMLElement {
[HTMLConstructor] constructor();
// FIXME: readonly attribute HTMLFormElement? form;
readonly attribute HTMLFormElement? form;
[CEReactions, Reflect=for] attribute DOMString htmlFor;
readonly attribute HTMLElement? control;