如何将ck-editor与jquery validate集成？

I would like to Integrate CK-editor with jquery validate, but it not working.

$("#commentForm").validate({
        rules: {
            txtckeditor: "required",
        },
        messages: {
            txtckeditor: "This field is required.",
          onkeyup: false,
        onblur: true
});

How to solve this problem ?

Before calling the validate try something like:

CKEDITOR.instances.txtckeditor.updateElement(); // then your validate call
$("#commentForm").validate({
        rules: {
                 ....