Javascript DOM HTML Document querySelectorAll() Method by tag and class name

Introduction

Get all <p> elements in the document 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 (index 0) in the document with class="example".

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<!DOCTYPE html>
<html>
<body>

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

<script>
function myFunction() {//from ww w  .j ava  2  s .  c  om
  var x = document.querySelectorAll("p.example");
  x[0].style.backgroundColor = "red";
}
</script>

</body>
</html>



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