Validate email address textbox using JavaScript

by

Assuming your regular expression is correct:

inside your script tags

function validateEmail(emailField){
        var reg = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

        if (reg.test(emailField.value) == false) 
        {
            alert('Invalid Email Address');
            return false;
        }

        return true;

}

in your textfield:

<input type="text" onblur="validateEmail(this);" />

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