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Bindings: Make item_value return an Optional<JS::Value>

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This removes some ambiguity about what the return value should be if
the index is out of range.

Previously, we would sometimes return a JS null, and other times a JS
undefined.

It will also let us fold together the checks for whether an index is a
supported property index, followed by getting the value just afterwards.
This commit is contained in:
Shannon Booth
2024-07-25 18:15:51 +12:00
committed by Andreas Kling
parent 9b59dc5e8b
commit c5c1a8fcc7
31 changed files with 53 additions and 47 deletions
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6
Userland/Libraries/LibWeb/HTML/HTMLFormElement.cpp
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@@ -935,11 +935,13 @@ bool HTMLFormElement::is_supported_property_index(u32 index) const
}
// https://html.spec.whatwg.org/multipage/forms.html#dom-form-item
JS::Value HTMLFormElement::item_value(size_t index) const
Optional<JS::Value> HTMLFormElement::item_value(size_t index) const
{
// To determine the value of an indexed property for a form element, the user agent must return the value returned by
// the item method on the elements collection, when invoked with the given index as its argument.
return elements()->item(index);
if (auto value = elements()->item(index))
return value;
return {};
}
// https://html.spec.whatwg.org/multipage/forms.html#the-form-element:supported-property-names