asp.net mvc 4 - jQuery 2.1.4 issue -

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i added autocomplete field view , works fine until make selection error in function:

 // support: android 2.3  // workaround failure string-cast null input  jquery.parsejson = function( data ) {       return json.parse(data + "");  };

it says there invalid character. if change this, don't error:

     // support: android 2.3      // workaround failure string-cast null input      jquery.parsejson = function( data ) {          if (data !== undefined)              return json.parse(data + "");          else              return null;      };

is there missing here? code simple , have used in numerous views:

 <table>                     <tr>                         <td>                             @html.displaynamefor(x=>x.state)&nbsp                             @html.textboxfor(x=>x.state, new { id = "txtstate", style = "width:50px"})                         </td>                         <td>                             @html.displaynamefor(x=>x.zip)&nbsp                             @html.textboxforwithtitle(x=>x.zip, new { id = "txtzip", style = "width:50px"})                         </td>                     </tr>                 </table>

js:

 $("#txtstate").autocomplete({         delay: 0,         minlength: 0,         autofocus: true,         source: function (request, response) {             $.ajax({                 type: 'get',                 data: { 'data': request.term },                 datatype: 'json',                 url: '@url.action("getstates")',                 success: function (data) {                     response($.map(data, function (obj) {                         return {                             value: obj.text,                             label: obj.value                         }                     }));                 }             });         },         open: function () {             $("#txtstate").autocomplete("widget").width(150);         },         select: function (event, ui) {             var test = ui.item.value;         }     }).focus(function () {         $("#txtstate").autocomplete('search', $("#txtstate").val());     }).blur(function () {         var keyevent = $.event("keydown");         keyevent.keycode = $.ui.keycode.enter;         $(this).trigger(keyevent);         if (neworold != "old") {             $("#txtstate").val($("#txtstate").val());         }     });


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