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Customising the CMS /

Simple username input check problem - AJAX


2 Posts   502 Views


Community Member, 22 Posts

25 September 2013 at 8:29am

Edited: 25/09/2013 8:34am

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!


Forum Moderator, 5513 Posts

28 September 2013 at 5:23pm

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=)