Document getElementsByClassName() Method - Change the background color of all elements with class="example": - Javascript DOM

Javascript examples for DOM:Document getElementsByClassName

  1. HOME
  2. Javascript
  3. DOM
  4. Document getElementsByClassName

Description

Document getElementsByClassName() Method - Change the background color of all elements with class="example":

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
.example {/*w  w w.j av a  2s  .com*/
    border: 1px solid black;
    margin: 5px;
}
</style>
</head>
<body>

<div class="example">
A div with class="example"
</div>

<div class="example">
Another div with class="example"
</div>

<p class="example">This is a p element with class="example".</p>

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

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

</body>
</html>

Related Tutorials