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Customising the CMS

Simple username input check problem - AJAX


2 Posts   433 Views


25 September 2013 at 8:29am (Last edited: 25 September 2013 8:34am), Community Member, 21 Posts

Hi, I am trying to make validation of a username field. Checks if exist and if exist, shows "choose another name" via ajax.

But problem is, that no value is passed to variable via Ajax. $_POST['username'] is empty.

So my code in controller:

public function checkuser1(){

      $Params = $this->getURLParams();      
if($Params['ID'] == '1'){
            if (Director::is_ajax()) {
                  $username = $_POST['username']; // Seems that I dont receive any value from input vie ajax

                  $username = mysql_real_escape_string($username);
                  $check_for_username = mysql_query("SELECT ID FROM Member WHERE UserName='$username'");
                     return '1';
                     return '0';
            else {
               return Director::redirect(Director::baseURL());


public function checkuser(){

      return $this->checkuser1();


And JS code:

<script type="text/javascript">

$(".container .inner .top .right").html("<img src='ajax-loader.gif' /> checking...");

               var username = $("#Form_RegistrationForm_UserName").val();
               var dataString = 'username='+ username;

                           if(server_response == '0'){
                              $(".container .inner .top .right").html("Username available");
                              $(".container .inner .top .right").html("Username already taken");



If anyone knows what is the problem, let me know :) Thanks for any help!


28 September 2013 at 5:23pm Forum Moderator, 5511 Posts

Try using the web inspector in your web browser, investigate the XHR panel to see what the request is being made (and ensure it contains your post data). I think the jQuery post argument takes an object rather than a string (i.e { 'username': username } rather than username=)