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HTML | onblur Attribute

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  • Difficulty Level : Basic
  • Last Updated : 16 Aug, 2022

This attribute fires at that moment when the element loses focus. This attribute is mostly used in Form validation code. This attribute is the opposite of onfocus attribute.
Supported Tags: It supports all HTML elements except these elements which are given below : 

  • <base>
  •  <bdo>
  •  <br>
  •  <head>
  •  <html>
  •  <iframe>
  •  <meta>
  •  <param>
  •  <script>
  •  <style>
  •  <title>

Syntax: 
 

<element onblur = "script">

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

html




<!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 1
  • Edge 12
  • Internet Explorer 9
  • Firefox 24
  • Opera 11.6
  • Safari 3.1

 


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