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JS email validation


We can validate the email by the help of JavaScript.

There are many criteria that need to be follow to validate the email id such as:

  • email id must contain the @ and . character
  • There must be at least one character before and after the @.
  • There must be at least two characters after . (dot).

Let’s see the simple example to validate the email field.

  1. <script>
  2. function validateemail()
  3. {
  4. var x=document.myform.email.value;
  5. var atposition=x.indexOf(“@”);
  6. var dotposition=x.lastIndexOf(“.”);
  7. if (atposition<1 || dotposition<atposition+2 || dotposition+2>=x.length){
  8.   alert(“Please enter a valid e-mail address \n atpostion:”+atposition+”\n dotposition:”+dotposition);
  9.   return false;
  10.   }
  11. }
  12. </script>
  13. <body>
  14. <form name=“myform”  method=“post” action=“#” onsubmit=“return validateemail();”>
  15. Email: <input type=“text” name=“email”><br/>
  16. <input type=“submit” value=“register”>
  17. </form>

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