Javascript DOM HTML Element querySelectorAll() Method count matched elements

Introduction

Find out how many elements with class="example" there are in a <div> element using the length property of the NodeList object:

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

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<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {//from   w  w  w . java2  s.c  om
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<div id="myDIV">
  <h2 class="example">A heading with class="example" in div</h2>
  <p class="example">A paragraph with class="example" in div.</p>
  <p class="example">Another paragraph with class="example" in div.</p>
</div>
<button onclick="myFunction()">Test</button>
<p id="demo"></p>

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



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