从一个控制器访问数据到另一个

Question

我卡住了，谁能帮帮我。这是代码。我正在编写 grabData 服务以从 url 获取数据。然后在控制器 firstcontroller 我根据 search 框过滤数据：这是代码：

.factory("grabData",['$http',function($http){
    return{
        showData:function(){
            return $http.get("/http://localhost:5555/sampleData.json");
        }
    }
}])
.controller('firstController',function($scope, $filter,grabData) {
         grabData.showData().success(function(data){
         $scope.items = data;
         $scope.items1 = $scope.items;

         $scope.$watch('search', function(val){
              $scope.items = $filter('filter')($scope.items1, val);
         });
}

HTML 代码为：<div ng-controller="firstController"> <input type="text" ng-model="search"> </div>

谁能帮我在下一个控制器中显示 $scope.items：

.controller('secondcontroller',function($scope){
   // Here I want to use $scope.items , from first controller
})
.controller('thirdcontroller',function($scope){
   // Here I want to use $scope.items , from first controller
})
.controller('fourthcontroller',function($scope){
   // Here I want to use $scope.items , from first controller
})

谁能帮忙解决这个问题。

Answer 1

这样写你的服务，

.service("grabData",['$http', '$q', function($http, $q){

    var sampleData = null;
    var filteredData = null;

    this.showData = function () {
        var deferred = $q.defer();

        if(sampleData!=null){  
           //if data has already been fetched from server before, serve it
            deferred.resolve(sampleData)
        } 
        else {   
            //else, fetch the data from server, and store it for future use
            $http.get("/http://localhost:5555/sampleData.json").then(function(res){
              sampleData = res.data;
              deferred.resolve(sampleData);
            })
        }
        return deferred.promise;
     };

     //call this from controller1, inside your watch
     this.setFilteredData = function(data){
        filteredData = data;
     };

     //call this from other 2 controllers
     this.getFilteredData = function(){
       return filteredData;
     };


    }])

然后像这样修改你的控制器，

.controller('secondcontroller',function($scope, grabData){
   // do whatever you want to do with grabData
   //use that "grabData.showData().success" pattern as it is still a promise
})
.controller('thirdcontroller',function($scope, grabData){
   // do whatever you want to do with grabData
   // call grabData.getFilteredData() from here
})
.controller('fourthcontroller',function($scope, grabData){
   // do whatever you want to do with grabData
   // call grabData.getFilteredData() from here
})

希望对您有所帮助。如有疑问，请在 cmets 中询问。

Answer 2

你需要注入工厂：

.controller('firstController', ['grabData', function($scope, $filter,grabData) {
  // Your code here
}]);

其他控制器也是如此。