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HTML oninvalid Event Attribute

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The oninvalid event attribute works when input field values are invalid or empty. The script runs when a user clicks on the submit button. The required input field must be filled out before submitting it. It is basically triggered when a form element encounters invalid input and provides real-time feedback on incorrect form submissions.

Syntax: 

<element oninvalid = "script">

Attribute Value:

This attribute contains a single value script which works when oninvalid attribute called. It is supported by all HTML elements.

Example 1:

In this example, we will see the implementation of the above event attribute. 

html

<!DOCTYPE html>
<html>
    <head>
        <title>oninvalid Event Attribute</title>
        <style>
            h1 {
                color:green;
            }
            body {
                text-align:center;
            }
        </style>
    </head>
    <body>
        <h1>GeeksForGeeks</h1>
        <h2>oninvalid Event Attribute</h2>
        <form action="#" method="post">
            First Name : <input type = "text" oninvalid =
            alert('Please Fill all input field!') required><br><br>
            Last Name : <input type = "text" oninvalid =
            alert('Please Fill all input field!') required><br>
            <input type="submit" value="Submit">
        </form>
    </body>
</html>                   

                    

Output: 

ad

Output

Example 2:

In this example, we will see the implementation of the above event attribute. 

HTML

<!DOCTYPE html>
<html>
 
<head>
    <title>oninvalid Example</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            text-align: center;
            margin: 50px;
        }
 
        h1 {
            color: green;
        }
 
        form {
            max-width: 400px;
            margin: 18px auto;
        }
 
        input {
            width: 100%;
            padding: 10px;
            margin-bottom: 10px;
            box-sizing: border-box;
        }
 
        input[type="submit"] {
            background-color: crimson;
            color: #fff;
            cursor: pointer;
        }
    </style>
</head>
 
<body>
 
    <h1>GeeksforGeeks</h1>
    <form action="#" method="post">
        <label for="firstName">First Name:</label>
        <input type="text" name="firstName"
               oninvalid="alert('Please fill in your first name!')"
               required>
 
        <label for="lastName">Last Name:</label>
        <input type="text" name="lastName"
               oninvalid="alert('Please fill in your last name!')"
               required>
 
        <input type="submit" value="Submit">
    </form>
 
</body>
 
</html>

                    

Output:

aw

Output


Supported Tags:

Supported Browsers:

The browser supported by oninvalid event attribute are listed below: 

  • Google Chrome 10 and above
  • Edge 12 and above
  • Firefox 4 and above
  • Opera 10 and above
  • Safari Not supported


Last Updated : 20 Dec, 2023
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