How to display html data from database to CKeditor?

I am using Laravel 5 and I am using ckeditor for my textarea. It saved html version to my database, but when I click a button to display it back to textarea for editing purpose, it won't display anything. Do you know how to fix it?

The edit button's code:

<a class="btn btn-warning" data-toggle="modal" data-target="#edit_surat" 
 onclick="modal_edit_nomor_surat('')"><i class="fa fa-edit"></i></a>

The javascript's code which I put below in same form with the edit button:

<script type="text/javascript">
 function modal_edit_nomor_surat(ringkasan){
      $('#edit_ringkasan').val(ringkasan);
 }

The ckeditor textarea's code for displaying the data from database:

<div class="form-group"> 
 <label for="ringkasan" class="control-label col-sm-2">Ringkasan</label>
 <div class="col-sm-9">
   <textarea id="edit_ringkasan" name="ringkasan" rows="10" cols="80"></textarea>
 </div>
</div>

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