javascript - AngularJs get data from $http before controller init -

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i have simple angularjs application, in want run slider , slider elements come $http request.

here code reference: 

var mainapp = angular.module("myapp", []);    mainapp.run(['$rootscope', '$http',     function($rootscope, $http) { $http.post('process.php?ajax_type=getchild').success(function(data) {             if (data.success) {                 console.log(data.child);  // data received...                 $rootscope.categories = data.child;             }         }); }]);  mainapp.controller('gridchildcontroller', function($scope, $http, $rootscope) { console.log($rootscope.categories);  // null.... $scope.brands = $rootscope.categories;     $scope.finished = function(){         jquery('.brand_slider').iosslider({             desktopclickdrag: true,              snaptochildren: true,              infiniteslider: false,              navnextselector: '.brands-next',              navprevselector: '.brands-prev',              lastslideoffset: 3,             onslidechange: function (args) {              }          });     }; });

here code of template file:

<div ng-app="myapp"> <div ng-controller="gridchildcontroller" class="brand_slider" >    <div class='slider'>       <div class="slide col-md-5ths col-sm-4 col-xs-12 text-center" ng-repeat="x in brands" ng-init="$last && finished()">           <a href="{{x.link}}"><img class="img-responsive center-block" ng-src="{{x.image}}" title="{{x.title}}" alt="{{x.title}}"></a>        </div>     </div>  </div> </div>

when run code, data $http ng-repeat doesn't work, , in controller data null.

if put on $rootscope available on child scopes. can bind straight categories (no need copy $scope.brands):

ng-repeat="x in categories"

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