nsGenericHTMLElement*
HTMLLabelElement::GetLabeledElement() const
{
nsAutoString elementId;
if (!GetAttr(kNameSpaceID_None, nsGkAtoms::_for, elementId)) {
// No @for, so we are a label for our first form control element.
// Do a depth-first traversal to look for the first form control element.
return GetFirstLabelableDescendant();
}
// We have a @for. The id has to be linked to an element in the same document
// and this element should be a labelable form control.
//XXXsmaug It is unclear how this should work in case the element is in
// Shadow DOM.
// See https://www.w3.org/Bugs/Public/show_bug.cgi?id=26365.
nsIDocument* doc = GetUncomposedDoc();
if (!doc) {
return nullptr;
}
Element* element = doc->GetElementById(elementId);
if (element && element->IsLabelable()) {
return static_cast<nsGenericHTMLElement*>(element);
}
return nullptr;
}
nsGenericHTMLElement*
HTMLLabelElement::GetLabeledElement() const
{
nsAutoString elementId;
if (!GetAttr(kNameSpaceID_None, nsGkAtoms::_for, elementId)) {
// No @for, so we are a label for our first form control element.
// Do a depth-first traversal to look for the first form control element.
return GetFirstLabelableDescendant();
}
// We have a @for. The id has to be linked to an element in the same document
// and this element should be a labelable form control.
nsIDocument* doc = GetCurrentDoc();
if (!doc) {
return nullptr;
}
Element* element = doc->GetElementById(elementId);
if (element && element->IsLabelable()) {
return static_cast<nsGenericHTMLElement*>(element);
}
return nullptr;
}
