Javascript DOM HTML Element getElementsByClassName() Method count matches elements

Introduction

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

Click the button to find out how many elements with class "child" there are inside the div element.

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<!DOCTYPE html>
<html>
<head>
<style>
div {//w  w w.j av  a2 s .co  m
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<div id="myDIV">
  <p class="child">A p element with class="child" in a div.</p>
  <p class="child">Another p element with class="child" in a div.</p>
  <p class="child">A third p element with class="child" in a div.</p>
</div>
<button onclick="myFunction()">Test</button>
<p id="demo"></p>

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

</body>
</html>



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