mootools | Unique email verification

Question

I have a mootools script:

Form.Validator.add('UniqueEmail', {
   errorMsg: 'Email is taken',
   test: function(element, props) {

      var valid = false;
      if (element.value.length > 0) {

         site.request(app, {'action':'account.email', 'email':element.value}, function(r){ 
           valid = parseInt(r.istaken) != 1 ? true : false;             
         },'GET');

         return valid;
      }
   }
});

/ Server returns: {"status":1,"istaken":0} / But input field verification : failed. Where is a problem? Thanks.

Answer 1

Your request callback function (the function that processes the server response) is run asynchronously, but the validation function returns the value of "valid" (false) immediately.

When the callback function runs (ie after the server responds) the Form.Validator.add() function has already finished executing and the field has been marked as invalid long ago.