How to get number of elements of a class before a certain element

Posted by David Shaikh on Stack Overflow See other posts from Stack Overflow or by David Shaikh
Published on 2012-09-06T18:14:56Z Indexed on 2012/09/06 21:38 UTC
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I want to know how many elements of a certain class appear in the DOM before an element that let's say has been clicked on.

<html>
  <div class="a">
  </div>
  <div class="b">
      <div class="a">
      </div>
  </div>
  <button>CLick me!</button>
  <div class="a">
  </div>
</html>

So in the previous DOM tree if the element to be clicked is the button, and Im looking for divs with class "a" it should return 2, even though in the whole tree there are 3, but "before" the button there are only 2.

How could I do that?

Thanks

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