javascript - jQuery autocomplete not filtering and showing all the values -

i'm trying populate auto suggestions javascript code unable it. want load data if first characters matched entered data.

$(function() {    $("#city").autocomplete(   {       search: function () {},       source: function (request, response)       {           $.ajax(           {               url: 'getcities.php',               datatype: "json",               data:               {                   term: request.term,               },               success: function (data)               {                   response(data);               }           });       },       minlength: 2,       select: function (event, ui)       {        }   });  }); 

my json format this

[     {"id":"1","name":"mumbai"},     {"id":"2","name":"delhi"} ]