javascript - Angular js : How to make make ajax call for directives to create options -

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i created directives form controls. there controls have options ajax[api] call.

i stuck here how make ajax call on directives.

    function selectcontroldir()     {         return {             transclude: true,             restrict: 'e',             scope: {                 data: '=data'             },             template: "<div ng-transclude></div><label>{{data._text}} </label><select type='text' name='{{data._attributename}}' id='{{data._attributename}}' >\n\ <option ng-repeat='ans in data._answeroptions'>{{ans._prompttext}}</option></select>"             ,             link: function (scope, element, attrs)             {                 //console.log("scope.data.questiondata", scope.data.questiondata);             }         };     }

plunker complete code http://plnkr.co/edit/op1qdwubecaospuc7r3n?p=preview

here want make api call year (on page load). on year change update options of make.

what can better have ng-change event directive on year element , in controller can use have array holds make happened in year: 

var app = angular.module('yourapp', []);  app.controller('yourcontroller', ['$scope', '$http',   function($scope, $http) {     $scope.o = {       makes: [{make:'make1'}, {make:'make2'}], // <---just demo       getmake: function(year) {         $http.post(url, {             year: year  // <----pass year backend year : { year:1990 }           })           .then(function success(response) {               $scope.o.makes = response.data; // <---put actual data here             },             function error(e) {               console.error(e);             });       }     };   } ]); 
<div ng-app='yourapp' ng-controller='yourcontroller'>   <select ng-model='year' ng-change='o.getmake(year)'>     <option>1990</option>     <option>1991</option>   </select>     <select ng-model='make' ng-options='make make.make make in o.makes track make.make'>     <option>make...</option>   </select> </div>

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