show echo from php using ajaxForm plugin

Question

I've made a registration form and used jQuery Form Plugin (ajaxForm) to save the user input to my database. I validated the input fields using javascript in my HTML file, but I checked the email and username in my Php file.

But the problem is, I don't know how to show the echo message in my html file. Like when it echoes "Username is already in use", how can i show it in my html file (as an alert)?

My code is still not complete, I have put mysql_real_escape and encrypted the password using md5. I will do it after I solve my problem. \\

Here is the code in saving the form to my database.

<script> 
        $(document).ready(function() { 
        var options = {
            resetForm: true,
            }
            $('form#register').ajaxForm(options);
        }); 
</script> 

Here is part of my php file

//username validation
$user_check = mysql_query("SELECT uname FROM se_reg WHERE uname='$uname'"); 
$do_user_check = mysql_num_rows($user_check); 

//email validation
$email_check = mysql_query("SELECT email FROM se_reg WHERE email='$email'"); 
$do_email_check = mysql_num_rows($email_check); 

//error message for username and email
if($do_user_check > 0){ 
$mess = $json_encode('Username is already in use.');
die("$mess"); 
} 

if($do_email_check > 0){ 
die("Email is already in use!"); 
} 

database name: se table: se_reg

Answer 1

Maybe this might help:

$('#myForm1').ajaxForm({
    resetForm: true,
    success: function(responseText, statusText, xhr, $form) {
        // responseText is whatever is echoed from server <--
        // statusText is going to = success here
        // xhr is similar to jqXHR (see jquery.ajax())
        // $form is the actual form that was submitted
    }
});

keep in mind, all you have to do PHP side is echo a string

if it's going to be somthing other than a string (aka integer or boolean) be sure to wrap the value in json_encode()