HTML onchange Event Attribute

The onchange event attribute works when the value of the element changes and select the new value from the List. It is a part of event attribute. It is similar to oninput event attribute. But the difference is while oninput attribute event occurs immediately after the value of element changes, while onchange event occur when the element looses focus. This attribute is associated with <select> element.

Supported Tags:

<input type=”checkbox”>
<input type=”file”>
<input type=”password”>
<input type=”radio”>
<input type=”range”>
<input type=”search”>
<input type=”text”>
<select>
<textarea>

Syntax:

<element onchange = "script">

Attribute Value: This attribute contains single value script which works when onchange attribute called.

Example:

html

<!DOCTYPE html>
<html>
 
<head>
    <title>onchange event attribute</title>
    <style>
        body {
            text-align:center;
        }
        h1 {
            color:green;
        }
    </style>
</head>
 
<body>
    <h1>GeeksforGeeks</h1>
    <h2>onchange Event Attribute</h2>
    <p>Choose Subject:</p>
    <select id="GFG"
            onchange="Geeks()">
        <option value="Data Structure">Data Structure
        <option value="Algorithm">Algorithm
        <option value="Computer Network">Computer Network
        <option value="Operating System">Operating System
        <option value="HTML">HTML
    </select>
    <p id="sudo"></p>
 
    <script>
        function Geeks() {
            let x = document.getElementById("GFG").value;
            document.getElementById("sudo").innerHTML =
            "Selected Subject: " + x;
        }
    </script>
</body>
 
</html>