Javascript DOM HTML Element querySelectorAll() Method get all <p> in a <div> by class name

Introduction

Get all <p> elements in a <div> with class="example", and set the background of the first <p> element:

Click the button to add a background color to the first p element in DIV with class="example" (index 0).

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<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {//from www.  j  av a2  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>


<script>
function myFunction() {
  var x = document.getElementById("myDIV").querySelectorAll("p.example");
  x[0].style.backgroundColor = "red";
}
</script>

</body>
</html>



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