HTML oninvalid Event Attribute


The HTML oninvalid event attribute is triggered when an input field is invalid while submitting the form in an HTML document.

Syntax

Following is the syntax −

<tagname oninvalid=”script”></tagname>

Example

Let us see an example of HTML oninvalid event Attribute −

<!DOCTYPE html>
<html>
<head>
<style>
   body {
      color: #000;
      height: 100vh;
      background: linear-gradient(62deg, #FBAB7E 0%, #F7CE68 100%) no-repeat;
      text-align: center;
      padding: 20px;
   }
   textarea {
      border: 2px solid #fff;
      background: transparent;
      font-size: 1rem;
   }
   ::placeholder {
      color: #000;
      font-size: 1rem;
   }
   .btn {
      background: #db133a;
      border: none;
      height: 2rem;
      border-radius: 2px;
      width: 40%;
      display: block;
      color: #fff;
      outline: none;
      cursor: pointer;
      margin: 1rem auto;
   }
</style>
</head>
<body>
<h1>HTML oninvalid Event Attribute Demo</h1>
<form action="" method="">
<textarea placeholder="Enter your message here" oninvalid="invalidFn()" rows='8' cols="50" required></textarea>
<input type="submit" value="SUBMIT" class="btn">
</form>
<p>Click on SUBMIT button without writing any message</p>
<script>
   function invalidFn() {
      document.querySelector('textarea').style.background = '#db133a6e';
      document.querySelector('textarea').setAttribute('placeholder', 'Please enter a message');
   }
</script>
</body>
</html>

Output

Click on “SUBMIT” button without entering any message in the text area and observe how oninvalid attribute works −

Updated on: 24-Sep-2019

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