JavaScript Form Validation Email Address

This script not allow a user to type incorrect e-mail address in your form (in a reasonable limits of course).

Script Demo:

Demo

JavaScript Code:

Insert this code into <head> tags

<script language="javascript">
function checkemail(str) {
    var r1 = new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");
  var r2 = new RegExp("^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");
  var isOK = !r1.test(str) && r2.test(str);
  if (!isOK)
    alert('Invalid Email!');
  return isOK;
 }
</script>

Insert this code into <body> tags

<form method="post" action="#" onSubmit="return checkemail(this.email.value)">
    <p>Enter an Email Address :
        <input type="text" id="email">
    </p>
    <p>
        <input type="submit" id="submit" value="Submit">
    </p>
</form>

Instruction:

Webmaster » Web Programming » JavaScript » Forms » Validation Email Address

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