Uncaught Error: Syntax error, unrecognized expression: #[object HTMLDivElement]

I'm passing a value to codeigniter function for getting a result. But the ajax value does not pass to the php function.

My script function follows :

<script src="http://ift.tt/1rKdStd"></script>
<Script>
$(document).ready(function() {
$("#up").on('click',function(){
      if ($("#incdec").val() < $(this).data("max")) {
        $("#incdec").val(parseInt($("#incdec").val())+1);
        }
});

$("#down").on('click',function(){
      if ($("#incdec").val() > $(this).data("min")) {
        $("#incdec").val(parseInt($("#incdec").val())-1);
      }
 });
 });
 $(document).ready(function() {
  $(".butt").on('click',function(){
    var e=$(".aa").val();
    alert(e);

    $.ajax({
         type:"POST",
         data:"id="+e,
         url:"<?php echo site_url('pages/getit');?>",
         success: function(html){
              $('#'+dataprocess).html(html);
         }
    });
  });
});

</script>

My HTML code :

<input type="text" name="incdec" id="incdec" value="0" class="aa"/>
<input type="button" class="butt"  id="up" value="Up" data-max="5" />
<input type="button" id="down" value="Down" data-min="0" class="butt"/>

<div id="dataprocess"></div>

But I'm getting an error as follows:

Uncaught Error: Syntax error, unrecognized expression: #[object HTMLDivElement]

Please help me find my mistake.