Javascript DOM HTML Document querySelectorAll() Method update by tag name

Introduction

Set the background color of all <p> elements in the document:

Click the button to change the background color of all p elements in the document.</p>

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<!DOCTYPE html>
<html>
<head>
<style>
.example {// w  w w  . j  a v a 2s  .c o m
  border: 1px solid black;
  margin: 5px;
}
</style>
</head>
<body>

<h1>A h1 element</h1>

<div>A div element</div>

<p>A p element.</p>

<p>Another p element.</p>

<div class="example">
  <p>A p element inside a div element.</p>
</div>

<button onclick="myFunction()">Test</button>

<script>
function myFunction() {
  var x = document.querySelectorAll("p");
  var i;
  for (i = 0; i < x.length; i++) {
    x[i].style.backgroundColor = "red";
  }
}
</script>

</body>
</html>



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