Ajax form submiting in Yii Follow @yiiframework

<?php
 
class PersonForm extends CFormModel
{
 
    public $name;
        public $age;
 
    /**
     * Declares the validation rules.
     * title is required
     */
    public function rules()
    {
        return array(
 
               );
    }
 
    /**
     * Declares attribute labels.
     */
    public function attributeLabels()
    {
        return array(
            'name'=>'Name',
                        'age'=>'Age',
        );
    }
 
}
 
?>

<div class="form">
 
<?php $form=$this->beginWidget('CActiveForm', array(
    'id'=>'person-form-edit_person-form',
    'enableAjaxValidation'=>false,
        'htmlOptions'=>array(
                               'onsubmit'=>"return false;",/* Disable normal form submit */
                               'onkeypress'=>" if(event.keyCode == 13){ send(); } " /* Do ajax call when user presses enter key */
                             ),
)); ?>
 
 
    <?php echo $form->errorSummary($model); ?>
 
    <div class="row">
        <?php echo $form->labelEx($model,'name'); ?>
        <?php echo $form->textField($model,'name'); ?>
        <?php echo $form->error($model,'name'); ?>
    </div>
        <div class="row">
        <?php echo $form->labelEx($model,'age'); ?>
        <?php echo $form->textField($model,'age'); ?>
        <?php echo $form->error($model,'age'); ?>
    </div>
 
 
    <div class="row buttons">
        <?php echo CHtml::Button('SUBMIT',array('onclick'=>'send();')); ?> 
    </div>
 
<?php $this->endWidget(); ?>
 
</div><!-- form -->
<script type="text/javascript">
 
function send()
 {
 
   var data=$("#person-form-edit_person-form").serialize();
 
 
  $.ajax({
   type: 'POST',
    url: '<?php echo Yii::app()->createAbsoluteUrl("person/ajax"); ?>',
   data:data,
success:function(data){
                alert(data); 
              },
   error: function(data) { // if error occured
         alert("Error occured.please try again");
         alert(data);
    },
 
  dataType:'html'
  });
 
}
 
</script>

class PersonController extends CController
{
 public function actionAjax()
 {
    $model=new PersonForm;
 
    // uncomment the following code to enable ajax-based validation
    /*
    if(isset($_POST['ajax']) && $_POST['ajax']==='person-form-edit_person-form')
    {
        echo CActiveForm::validate($model);
        Yii::app()->end();
    }
    */
 
 
    if(isset($_POST['PersonForm']))
    {
 
 
        $model->attributes=$_POST['PersonForm'];
        if($model->validate())
        {
           // form inputs are valid, do something here
           print_r($_REQUEST);
           return;
 
 
 
        }
    }
    $this->render('person_form',array('model'=>$model));
 
 }