Javascript DOM HTML Element getElementsByTagName() Method count matched elements

Introduction

Find out how many <p> elements there are inside a <div> element using the length property of the NodeList object:

Click the button to find out how many p elements there are inside the div element.

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<!DOCTYPE html>
<html>
<head>
<style>
div {/*from w ww.j  av  a  2 s.  co  m*/
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<div id="myDIV">
  <p>A p element in div.</p>
  <p>Another p element in div.</p>
  <p>A third p element in div.</p>
</div>
<button onclick="myFunction()">Test</button>
<p id="demo"></p>
<script>
function myFunction() {
  var x = document.getElementById("myDIV").getElementsByTagName("P");
  document.getElementById("demo").innerHTML = x.length;
}
</script>
</body>
</html>



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