javascript - Want to make http get request only if text is typed in input field ANGULARJS -

the data coming local json file, want make http.get request when searchtext (on keypress) typed in input field

  <input type="text" class="form-control" ng-model="searchtext"> 

i show results in following table:

<table ng-if="searchtext" class="searchresults table table-bordered table-hover table-responsive">    <tr>     <th>dll id</th>     <th>kvk nummer</th>     <th>company name</th>   </tr>    <tr ng-repeat="data in getdata | filter: customfilter">    <td>{{data.id}}</td>    <td>{{data.sttax_id_vat_number}}</td>    <td>{{data.accountname}}</td> </table> 

in controller have far following:

    $scope.searchtext = undefined;      if($scope.searchtext){     $http.get('data/json_sample/dv_ic_01.json')             .success(function(data){                 $scope.alldata = data;                 $scope.getdata = $scope.alldata.d.results;             }); }     $scope.customfilter = function(row){         if (!$scope.searchtext){                 return true;             }          return (row.sttax_id_vat_number.indexof($scope.searchtext) !== -1) || (row.accountname.tolowercase().indexof($scope.searchtext.tolowercase()) !== -1);     } 

i'd use directive ng-change.

<input type="text" class="form-control" ng-model="searchtext" ng-change="getdata()"> 

inside controller:

$scope.getdata = function(){   //implement $http logic. }