You could make usage of Array.prototype.indexOf
. For that, we need to somewhat “cast” the HTMLNodeCollection
into a true Array
. For instance:
var nodes = Array.prototype.slice.call( document.getElementById('list').children );
Then we could just call:
nodes.indexOf( liNodeReference );
Example:
var nodes = Array.prototype.slice.call( document.getElementById('list').children ),
liRef = document.getElementsByClassName('match')[0];
console.log( nodes.indexOf( liRef ) );
<ul id="list">
<li>foo</li>
<li class="match">bar</li>
<li>baz</li>
</ul>