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Customising the CMS

SilverStripe Forums » Customising the CMS » Simple username input check problem - AJAX

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  • Johnny9
    Community Member
    15 Posts

    Simple username input check problem - AJAX Link to this post

    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!

  • Willr
    Forum Moderator
    5462 Posts

    Re: Simple username input check problem - AJAX Link to this post

    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=)

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