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HTMLCollection is an awkward legacy interface from the DOM spec. It provides a live view of a DOM subtree, with some kind of filtering that determines which elements are part of the collection. We now return HTMLCollection objects from these APIs: - getElementsByClassName() - getElementsByName() - getElementsByTagName() This initial implementation does not do any kind of caching, since that is quite a tricky problem, and there will be plenty of time for tricky problems later on when the engine is more mature.
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/DOM/Element.h>
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#include <LibWeb/DOM/HTMLCollection.h>
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#include <LibWeb/DOM/ParentNode.h>
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namespace Web::DOM {
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HTMLCollection::HTMLCollection(ParentNode& root, Function<bool(Element const&)> filter)
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: m_root(root)
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, m_filter(move(filter))
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{
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}
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HTMLCollection::~HTMLCollection()
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{
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}
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Vector<NonnullRefPtr<Element>> HTMLCollection::collect_matching_elements()
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{
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Vector<NonnullRefPtr<Element>> elements;
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m_root->for_each_in_inclusive_subtree_of_type<Element>([&](auto& element) {
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if (m_filter(element))
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elements.append(element);
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return IterationDecision::Continue;
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});
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return elements;
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}
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size_t HTMLCollection::length()
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{
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return collect_matching_elements().size();
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}
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Element* HTMLCollection::item(size_t index)
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{
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auto elements = collect_matching_elements();
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if (index >= elements.size())
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return nullptr;
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return elements[index];
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}
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Element* HTMLCollection::named_item(FlyString const& name)
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{
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if (name.is_null())
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return nullptr;
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auto elements = collect_matching_elements();
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// First look for an "id" attribute match
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if (auto it = elements.find_if([&](auto& entry) { return entry->attribute(HTML::AttributeNames::id) == name; }); it != elements.end())
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return *it;
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// Then look for a "name" attribute match
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if (auto it = elements.find_if([&](auto& entry) { return entry->name() == name; }); it != elements.end())
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return *it;
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return nullptr;
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}
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}
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