Javascript DOM HTML Element querySelectorAll() Method get first <p> element

Introduction

Get all <p> elements inside a <div> element, and set the background color of the first <p> element:

Click the button to add a background color to the first p element in div.

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

<div id="myDIV">
  <p>This is a p element in div.</p>
  <p>This is also a p element in div.</p>
</div>

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

</body>
</html>



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