tinymce Editor

if you use tinyMCE  in ajax you will use mce api to get content and set content 

this example show how can use it 

function loadComplete(entity){

       if(tinyMCE.get('editor')!=null)

             tinyMCE.get('editor').setContent(entity.informationText); 

}

function beforeSave(entity){

        tinyMCE.triggerSave();

        entity.informationText=$('#txt_editor').val();

         return entity;

}

<form id="frm_main" data-options="onLoadComplete:loadComplete,beforeSave:beforeSave'">

    <textareaid="editor"data-bind="informationText"  class="editor"style="height: 200px;direction: rtl" ></textarea>

</form>