d3.js - How to get only those data which have particular code in crossfilter -

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i have following dataset

var data= [ {code:501, value:25}, {code:501, value:30}, {code:501, value:30}, {code:501, value:35}, {code:501, value:60}, {code:502, value:25}, {code:502, value:25} ]

i want dataset contains data code 501. tried following code

var ndx=crossfilter(data); var dim1=ndx.dimension(function(d){return d.code}); var filtereddata=dim1.filter(501);

but not working. not returning me data want. tried print returned data using console printed vague things.

function getdata(){    var range = $("#range").val()*1;    if(isnan(range)){      alert("kindly enter valid number");    }else{      var data=  [  {code:501, value:25},  {code:501, value:30},  {code:501, value:30},  {code:501, value:35},  {code:501, value:60},  {code:502, value:25},  {code:502, value:25}  ];    var ndx=crossfilter(data);  var dim1=ndx.dimension(function(d){return d.code});  var filtereddata=dim1.filter(range);      alert("requested data is\n"+(json.stringify(dim1.top(infinity))));  }      }  
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.4.11/d3.min.js"></script>  <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>  <script src="https://cdnjs.cloudflare.com/ajax/libs/crossfilter/1.3.11/crossfilter.js"></script>  <input type='text' id='range'>  <input type='button' value='getdata' onclick='getdata()'>

i think looking this.... :d


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