Javascript DOM HTML Document getElementsByClassName() Method count returned element

Introduction

Find out how many elements with class="example" there are in the document using the length property of the HTMLCollection object: 

var x = document.getElementsByClassName("example").length;

Click the button to find out how many elements with class "example" there are in this document.

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<!DOCTYPE html>
<html>
<body>

<div class="example">
A div element with class="example"
</div>/*from w w  w  .  j a va2s.c om*/

<div class="example">
Another div element with class="example"
</div>
<p class="example">A p element with class="example"</p>
<button onclick="myFunction()">Test</button>
<p id="demo"></p>

<script>
function myFunction() {
  var x = document.getElementsByClassName("example");
  document.getElementById("demo").innerHTML = x.length;
}
</script>

</body>
</html>



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