after ajax form submit value from ckeditor textarea is not sent through post

You can force CKeditor to update the textarea value using:

for (instance in CKEDITOR.instances) {    CKEDITOR.instances[instance].updateElement();}

Also, you can use .serialize for the data - then you won't have to maintain the AJAX code if parameters change:

<script src="ckeditor/ckeditor.js"></script>function saveArt() {    for (instance in CKEDITOR.instances) {        CKEDITOR.instances[instance].updateElement();    }    jQuery.ajax({        type: 'POST',        url: 'art_save.php',        data: $("#art").serialize()     });       return false;  }

for (instance in CKEDITOR.instances) {    CKEDITOR.instances[instance].updateElement();}$.ajax({    url: "controllers/c.publicidad.php?task=save",    type: 'post',    data: $("form[name='form']").serialize(),    dataType: 'json',    success: function(data) {        if(data.idenvio != ''){            $("form[name='frmPublicidad']").toggle("slow");            $("#MessageSuscripcion").html(data.message);        }    }});

I fix updated the field value on change. Here my code:

HTML:

<div class="row">    <div class="form-group col-sm-11">        <label for="ckfield">ckfield</label>        <textarea id="ckfield" class="form-control" rows="10" name="ckfield" cols="50"></textarea>    </div></div>

JS:

<script>$(function(){    var $ckfield = CKEDITOR.replace( 'ckfield' );    $ckfield.on('change', function() {      $ckfield.updateElement();             });});</script>