addExternalElementToElement method

  1. @override
List<Node>? addExternalElementToElement(
  1. Node element,
  2. Object? externalElement, {
  3. DOMTreeMap<Node>? treeMap,
  4. DOMContext<Node>? context,
})
override

Implementation

@override
List<Node>? addExternalElementToElement(Node element, Object? externalElement,
    {DOMTreeMap<Node>? treeMap, DOMContext<Node>? context}) {
  if (externalElement == null) return null;
  if (!element.isA<Element>()) return null;

  externalElement = resolveElements(externalElement,
      treeMap: treeMap, context: context, setTreeMapRoot: false);

  if (externalElement is List) {
    var added = <Node>[];
    for (var e in externalElement) {
      if (e == null) continue;

      if (e is List) {
        var l = addExternalElementToElement(element, e,
            treeMap: treeMap, context: context);
        if (l != null) {
          added.addAll(l);
        }
      } else {
        var jsAny = e.asJSAny;
        if (jsAny.isA<Node>()) {
          var node = jsAny as Node;
          element.appendChild(node);
          added.add(node);
        }
      }
    }
    return added;
  } else {
    var jsAny = externalElement.asJSAny;
    if (jsAny.isA<Node>()) {
      var node = jsAny as Node;
      element.appendChild(node);
      return [node];
    }
  }

  return null;
}