Issues in add validate email in javascript

Question

Here is my code:

 <form method="post" name="form1" action="invitation_enrollv5.asp?action=1" onSubmit="return GetTextValue()">

<input style="float:right;" id="nextbutton" name="" type="submit" value="Next" />       
</form>

May i know, how and where can i add validate script to validate input email address.

If i blank or invalid id means it shows error states.

Can anyone help me? thanks in advance.

Answer 1

For input boxes, you can specify the type as email, and the browser will validate for you.

<input type="email" required>

Or for javascript:

function validate(emailString) {
    return /^[A-Z0-9._%+-]+@[A-Z0-9.-]+.[A-Z]{2,4}$/i.test(emailString)
}

This will return true if the value for the emailString parameter is a valid email.