title: Yii ajaxSubmitButton() with fields validation
body: <p>I'm using Yii ajaxSubmitButton() to submit a form. Besides, I have set the 'enableAjaxValidation' parameter to true to validate the corresponding textboxes.</p>
  
  <p>What I am able to do:</p>
  
  <ol>
  <li>Validate the field when the focus leaves it, asynchronously.</li>
  <li>Invoke the server side method when the button is clicked, asynchronously.</li>
  </ol>
  
  <p>The problem is that I don't know how to perform the fields validation when the submit button is clicked and, if the model is validated, perform a partial rendering in client side.</p>
  
  <p>If I override the 'success' event in ajaxSubmitButton, I get the partial rendering, but I can't maintain the model validation..</p>
  
  <p>Any help?</p>
  
  <hr>
  
  <p>EDIT</p>
  
  <p>Thanks for the reply,</p>
  
  <p>The validateOnSubmit flag is already set and the model would be validated correctly if the 'success' event was not set.</p>
  
  <p>When the ajaxSubmitButton is like this:</p>
  
  <pre><code>&lt;?php echo CHtml::ajaxSubmitButton( 'Send',
                                          CHtml::normalizeUrl(array('site/ajaxIndexSubmit')),
                                          array(
                                          'error'=&gt;'js:function(){
                                              alert(\'error\');
                                          }',
                                          'beforeSend'=&gt;'js:function(){
                                              alert(\'beforeSend\');
                                          }',
                                          'success'=&gt;'js:function(data){
                                              alert(\'success, data from server: \'+data);
                                          }',
                                          'complete'=&gt;'js:function(){
                                              alert(\'complete\');
                                          }',
                                          //'update'=&gt;'#where_to_put_the_response',
                                          )
                                      );
      ?&gt;
  </code></pre>
  
  <p>the alert('success') will print the string corresponding to the model validation. Once I have that string, what logic must be invoken in client side?</p>
  
  <p>The reason to override the 'success' javascript handler is to receive a partial rendering from the server, different to the model validation. I want both things: validation and partial rendering.</p>