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HTML | onblur Attribute
  • Difficulty Level : Basic
  • Last Updated : 19 Jul, 2019

This attribute fires at that moment when the element loses focus. This attribute is mostly used in Form validation code. This attribute is opposite of onfocus attribute.

Syntax:

<element onblur = "script">

Attribute Value: This attribute is used to any HTML elements. The script run when onblur attribute called.

Example:




<!DOCTYPE html>
<html>
    <head>
        <title>onblur attribute</title>
        <style>
            body {
                text-align:center;
            }
            h1 {
                color:green;
            }
        </style>
    </head>
    <body>
        <h1>GeeksforGeeks</h1>
        <h2>onblur attribute</h2>
          
        <!-- When leave the input box then the input box 
        value is converted into capital letter. -->
        Username: <input type="text" name="fname" id="GFG" 
        onblur="Geeks()">
        <script>
        function Geeks() {
            var y = document.getElementById("GFG");
            y.value = y.value.toUpperCase();
        }
        </script>
    </body>
</html>                    

Output:
Before clicking outside:

After clicking outside:

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

  • Google Chrome
  • Internet Explorer
  • Firefox
  • Opera
  • Safari
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