Element querySelectorAll() Method - Set the background color of all elements with class="example" in a <div> element: - Javascript DOM

Javascript examples for DOM:Element querySelectorAll

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Description

Element querySelectorAll() Method - Set the background color of all elements with class="example" in a <div> element:

Demo Code

ResultView the demo in separate window 

<!DOCTYPE html>
<html>
<head>
<style>
#myDIV {/*from www .  ja  v  a  2s. com*/
    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 p element with class="example" in a div.</p>
  <p class="example">Another p element with class="example" in a div.</p>
  <p>A p element in div with a <span class="example">span element with class="example"</span> inside of it.</p>
</div>

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

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

</body>
</html>

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