HTML | onfocus Event Attribute

Difficulty Level : Basic
Last Updated : 03 Dec, 2018

This onfocus attribute works when the element gets focused. This event attribute is mostly used with <input>, <select>, <a> elements. This event attribute is supported by all HTML elements excepts <base>, <bdo>, <br>, <head>, <html>, <iframe>, <meta>, <param>, <script>, <style>, and <title> elements.

Syntax:

<element onfocus = "script">

Attribute Value: The script value run when onfocus attribute called.

Example:

<!DOCTYPE html>
<html>
    <head>
        <title>onfocus attribute</title>
        <style>
            h1 {
                color:green;
            }
            body {
                text-align:center;
            }
            input {
                color:white;
                margin-top:5px;
                border:1px solid black;
                border-radius:3px;
            }
        </style>
        <script>
            function sudo(x) {
                document.getElementById(x).style.background = "green";
            }
        </script>
    </head>
    <body>
        <h1>GeeksforGeeks</h1>
        <h2>onfocus event attribute</h2>
        First name: <input type="text" id="fname" 
        onfocus="sudo(this.id)"><br>
        Last name: <input type="text" id="lname"
        onfocus="sudo(this.id)">
    </body>

Output:

Supported Browsers: The browser supported by onfocus attribute are listed below:

Apple Safari
Google Chrome
Firefox
Opera
Internet Explorer

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