/**
  * Returns the JavaScript needed for performing client-side validation.
  * @param CModel $object the data object being validated
  * @param string $attribute the name of the attribute to be validated.
  * @return string the client-side validation script.
  * @see CActiveForm::enableClientValidation
  */
 public function clientValidateAttribute($object, $attribute)
 {
     $phis = new PasswordHistory();
     $passes = $phis->getHistory(Yii::app()->user->id);
     $condition = "1==2";
     foreach ($passes as $pass) {
         $value = $object->{$attribute};
         if (PasswordHelper::verifyPassword($value, $pass->password)) {
             $condition = "1==1";
             $this->addError($object, $attribute, 'You can not use a password which you have already used!');
             break;
         }
     }
     return "\n\tif(" . $condition . ") {\n\t\tmessages.push(" . CJSON::encode('your password is too weak, you fool!') . ");\n\t}\n\t";
 }