AJAX live checking availability with submit button

Question

• test1.php

Answer 1

Instead of using a click handler for the button, use the form submit event.

$(document).ready(function () {
    $('#username').change(function () {
        var userName = $('#username').val();

        $.post("getUserName.php", {
            userName: userName
        }, function (data) {
            $("#userNameCheck").html(data);
        });
    });

    $('#addform').submit(function () {
        //if the text is `You can use it` allow the form submit else block it
        return $("#userNameCheck").html().trim() == 'You can use it';
    });
});

Also make sure that you do the same validation in test2.php because, the client side validation can be side stepped.