如何在Angularjs中将值从服务传递到控制器

时间:2016-01-13 11:54:55

标签: javascript angularjs angular-services highcharts-ng angular-controller

我正在使用angular dashboard framework创建一个小部件,但我仍然坚持如何将服务中生成的数据值传递给控制器​​?我想将 var new_x 的值传递给它在函数showInfo中生成的控制器服务。但是在将其添加到控制器

时出现以下错误
TypeError: Cannot read property 'showInfo' of undefined
    at new <anonymous> (piechartCtrl.js:62) *(piechartCtrl.js:62 is data: $scope.chartService.showInfo())* 
    at invoke (angular.js:4523)
    at Object.instantiate (angular.js:4531)
    at angular.js:9197
    at $q.all.then.msg (widget-content.js:115)
    at processQueue (angular.js:14792)
    at angular.js:14808
    at Scope.$get.Scope.$eval (angular.js:16052)
    at Scope.$get.Scope.$digest (angular.js:15870)
    at Scope.$get.Scope.$apply (angular.js:16160)

我的代码是

angular.module('adf.widget.charts')
   .service('chartService', function(){
  return {
     getUrl: function init(path) {
        Tabletop.init( { key: path,
                         callback: showInfo,
                         simpleSheet: true } )
     }
  }

function showInfo(data, tabletop) {

  var new_x = data.map(function(el) {

  return {
    "name": el[Object.keys(el)[0]],
    "y": +el[Object.keys(el)[1]]
  };

});
    console.log(JSON.stringify(new_x))

};

})


  .controller('piechartCtrl', function (chartService, $scope) {
     $scope.chartConfig = {
        options: {
            chart: {
                type: 'pie'
            }
        },
        series: [{
            data: $scope.chartService.showInfo()
        }],
        title: {
            text: 'Add Title here'
        },

        loading: false
    }


});

chart.js以防万一需要

'use strict';

angular.module('adf.widget.charts', ['adf.provider', 'highcharts-ng'])
  .config(function(dashboardProvider){
    var widget = {
      templateUrl: '{widgetsPath}/charts/src/view.html',
      reload: true,
      resolve: {
        /* @ngInject */
        urls: function(chartService, config){
          if (config.path){
            return chartService.getUrl(config.path);
          }
        }
      },
      edit: {
        templateUrl: '{widgetsPath}/charts/src/edit.html'
      }
  };

  dashboardProvider
      .widget('piechart', angular.extend({
        title: 'Custom Piechart',
        description: 'Creates custom Piechart with Google Sheets',
        controller: 'piechartCtrl'
        }, widget));
  });

2 个答案:

答案 0 :(得分:1)

您正在从$ scope调用该服务,替换该行,它应该像这样修复它:

  series: [{
            data: chartService.showInfo()
        }],

您的控制器将如下所示:

.controller('piechartCtrl', function (chartService, $scope) {
 $scope.chartConfig = {
    options: {
        chart: {
            type: 'pie'
        }
    },
    series: [{
        data: chartService.showInfo()
    }],
    title: {
        text: 'Add Title here'
    },

    loading: false
}

答案 1 :(得分:1)

我添加了一个workable JSFiddle demo来为您简化。下面是对那里的描述。

在您的服务中,返回从控制器调用所需的方法:

angular.module('adf.widget.charts')
   .service('chartService', function($q){

      var chartService = {};

      charService.showInfo = function(){

          var new_x = data.map(function(el) {
            return $q.resolve( {
                name: el[Object.keys(el)[0]],
                y: el[Object.keys(el)[1]]
            });

     }
     ...
     return chartService;

   }

注意:在showInfo()中,请确保使用$q返回一个承诺,以执行该调用$q.resolve并将您返回的数据传递给它。

在控制器内

.controller('piechartCtrl', function (chartService, $scope) {
   chartService.showInfo()
    .then(function(data){
      //your returned data
    });

}

还要确保执行以下操作:

将控制器定义与服务定义分开,并在控制器模块中指定与服务模块的依赖关系,我的意思是

在单独的模块中定义服务:

angular.module("services", [])
.factory("myService", function(){.....});

和控制器在不同的模块中并识别依赖

angular.module("controllers", ["services"])
.controller("myController", function(){....});