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

CKEDITOR.instances["editor1"].on("instanceReady", function()
{
//set keyup event
this.document.on("keyup", CK_jQ);

 //and paste event
this.document.on("paste", CK_jQ);
});

function CK_jQ()
{

    CKEDITOR.tools.setTimeout( function()
    {
        $("#editor1").val(CKEDITOR.instances.editor1.getData());
    }, 0);
}

CKEDITOR.instances["editor1"].document.on('keydown', function(event)
{
    CKEDITOR.tools.setTimeout( function()
    {
        $("#editor1").val(CKEDITOR.instances.editor1.getData());
    }, 0);
});

CKEDITOR.instances["editor1"].document.on('paste', function(event)
{
    CKEDITOR.tools.setTimeout( function()
    {
        $("#editor1").val(CKEDITOR.instances.editor1.getData());
    }, 0);
});

console.log(CKEDITOR.instances.editor1.getData());

CKEDITOR.instances["editor1"].on("instanceReady", function()
{
//set keyup event
this.document.on("keyup", CK_jQ);

 //and paste event
this.document.on("paste", CK_jQ);
}

function CK_jQ()
{
   CKEDITOR.instances.editor1.updateElement();
}

CKEDITOR.instances.editor1.on('contentDom', function() {
          CKEDITOR.instances.editor1.document.on('keyup', function(event) {/*your instructions*/});
        });

var editor = CKEDITOR.replace('editor');

CKEDITOR.instances.editor.on("instanceReady", function(){
    this.on('contentDom', function() {
        this.document.on('keydown', function(event) {
            CKEDITOR.tools.setTimeout( function(){
                $(".seldiv").html(CKEDITOR.instances.editor.getData());
            }, 1);
        });
    });
    this.on('contentDom', function() {
        this.document.on('paste', function(event) {
            CKEDITOR.tools.setTimeout( function(){
                $(".seldiv").html(CKEDITOR.instances.editor.getData());
            }, 1);
        });
    });
    edits_clix();
    var td = setTimeout("ebuttons()", 1);
})

<script type="text/javascript">
  var editor = CKEDITOR.replace( 'editor1' );
  editor.on("instanceReady", updateInstance() )
</script>

function updateInstance()
{
CKEDITOR.instances["editor1"].document.on('keydown', function(event)
{
    CKEDITOR.tools.setTimeout( function()
    {
        $("#editor1").val(CKEDITOR.instances.editor1.getData());
    }, 0);
});

CKEDITOR.instances["editor1"].document.on('paste', function(event)
{
    CKEDITOR.tools.setTimeout( function()
    {
        $("#editor1").val(CKEDITOR.instances.editor1.getData());
    }, 0);
});

}

$(document).ready(function() {
$('#form').submit(function(){
if ( CKEDITOR.instances.editor1.getData() == '' ){
    alert( 'There is no data available' );//an alert just to check if its working
}else{
    var editor_data = CKEDITOR.instances.editor1.getData();
    $("#editor1").val(editor_data); //at this point i give the value to the textarea
    $.ajax({
                    //do your ajax here

                     });

        }
return false;
    });
 });

if (typeof CKEDITOR !== "undefined") {
    for ( instance in CKEDITOR.instances )
        CKEDITOR.instances[instance].updateElement();
}