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

Question

i have a form having some textfields and a textarea (ckeditor), after onclick button art_title field value is sent to art_save.php page, but value from textarea is not sent.

Answer 1

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);
        }
    }
});