Example
The NodeIterator interface provides methods for iterating over nodes in a DOM tree.
Given a document like this one:
<html>
<body>
<section class="main">
<ul>
<li>List Item</li>
<li>List Item</li>
<li>List Item</li>
<li>List Item</li>
</ul>
</section>
</body>
</html>
One could imagine an iterator to get the <li> elements:
let root = document.body;
let whatToShow = NodeFilter.SHOW_ELEMENT | NodeFilter.SHOW_TEXT;
let filter = (node) => node.nodeName.toLowerCase() === 'li' ?
NodeFilter.FILTER_ACCEPT :
NodeFilter.FILTER_REJECT;
let iterator = document.createNodeIterator(root, whatToShow, filter);
var node;
while (node = iterator.nextNode()) {
console.log(node);
}
Example adapted from the example provided by the Mozilla Contributors from the document.createNodeIterator() documentation on the Mozilla Developer Network, licensed under CC-by-SA 2.5.
This will log something like:
<li>List Item</li>
<li>List Item</li>
<li>List Item</li>
<li>List Item</li>
Note that this is similar to the TreeWalker iterface, but provides only nextNode() and previousNode() functionality.
