title: CKEDITOR value NULL when inserting to db
body: <p>Sorry for my bad english,
  I wan't to inserting data to database with CKEDITOR and ajax submit, i have code</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$('#add').submit(function(e) {
   var fd = new FormData(this);
   e.preventDefault();
   // CKEDITOR.instances.isiForm.updateElement();
   for ( instance in CKEDITOR.instances ) {
    CKEDITOR.instances.isiForm.updateElement();
   }
   $.ajax({
    type: "POST",
    url:  "blog_add",
    data: fd,
    cache: false,
          contentType: false,
          processData: false,
    success: function(result){
     if(result=='1'){
      table.ajax.reload(null,false);
       $('#add').modal('hide');
      // success result
     } else {
      // failed result
        }
    }
   });
  });</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;form class="modal fade" id="add" enctype="multipart/form-data"&gt;
   &lt;div class="form-group"&gt;
    &lt;label&gt;Isi Post&lt;/label&gt;
    &lt;textarea id="isiForm" name="isiForm" cols="5" class="form-control rsf"&gt;&lt;/textarea&gt;
   &lt;/div&gt;
  &lt;/form&gt;</code></pre>
  </div>
  </div>
  </p>
  
  <p>I have tried using CKEDITOR.instances.isiForm.updateElement(); but it not works, the value always NULL, so how can i insert to database with ajax? and i have try many thread but no one succeed</p>