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Like angularjs app.service and $ q in typescript

I am very new to typescript and angular Js. I can not find the correct answer, my code is below:

export class SidenavController {
static $inject = ['$scope', '$mdSidenav'];
     constructor(private $scope: any,private $mdSidenav: any) {

     }
toggleSidenav(name: string) {
    this.$mdSidenav(name).toggle();
     }
  loadHelpInfo() {
    this.helpService.loadAll()
      .then(function(help) {
        this.$scope.helpInfo = [].concat(help);
        this.$scope.selected = this.$scope.helpInfo[0];
      })
  }
  selectHelpInfo(help) {
    this.$scope.selected = angular.isNumber(help) ? this.$scope.helpInfo[help] : help;
    this.$scope.toggleSidenav('left');
  } 

}
app.service('helpService', ['$q', function($q) {
  var helpInfo = [{
      name: 'Introduction',
      content: '1 '
  }, {
      name: 'Glossary',
      content: '2'
  }, {
      name: 'Log In',
      content: '3'
      }, {
      name: 'Home Page',
      content: '4'
  }];

  return {
      loadAll: function() {
          return $q.when(helpInfo);
      }
  };
}]);

In the above code, I want to use helpService to load the details on the screen. At runtime, I get the following error: app / components / sidenav / sidenav-controller.ts (10,10): error TS2339: property "helpService" does not exist in type "SidenavController". I am not sure how to use services in typescript. Also, if required, I executed the code version of angular:

http://codepen.io/snehav27/pen/JdNvBV

I'm basically trying to make the typescript version above the snippet

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1 answer

helpservice .

     static $inject = ['$scope', '$mdSidenav', 'helpService'];
     constructor(private $scope: any,private $mdSidenav: any, private helpService:any) {

     }

Typescript , this.helpService, TS this.helpService.loadAll " loadAll undefined" .

Arrow this @

  this.helpService.loadAll()
  .then((help) => { //<-- here
    this.$scope.helpInfo = [].concat(help);
    this.$scope.selected = this.$scope.helpInfo[0];
  });

, this .

helpservice .

export interface IHelpService{
  loadAll():ng.IPromise<Array<HelpInfo>>; //use specific typing instead of any
}

export interface HelpInfo{
  name:string;
  content:string;
}

class HelpService implements IHelpService{
    private _helpInfo:Array<HelpInfo> = [{
      name: 'Introduction',
      content: '1 '
  }, {
      name: 'Glossary',
      content: '2'
  }, {
      name: 'Log In',
      content: '3'
      }, {
      name: 'Home Page',
      content: '4'
   }];

    static $inject = ['$q'];
    constructor(private $q:ng.IQService){
    }

    loadAll(){
       return this.$q.when(this._helpInfo);
    }

 }

angular.module('HelpApp').service('helpService', HelpService);


 constructor(private $scope: any,private $mdSidenav: any, private helpService:IHelpService) {

Typescript defn . , , - (, ).

export class SidenavController {

    helpInfo:Array<HelpInfo>;
    selected:HelpInfo; 

    static $inject = ['$mdSidenav', 'helpService'];
    constructor(private $mdSidenav: any, private helpService:IHelpService) {}

     toggleSidenav(name: string) {
        this.$mdSidenav(name).toggle();
     }

     loadHelpInfo() {
        this.helpService.loadAll()
          .then((help) => {
            this.helpInfo = [].concat(help);
            this.selected = this.helpInfo[0];
          })
      }

      selectHelpInfo(help) {
        this.selected = angular.isNumber(help) ? this.helpInfo[help] : help;
        this.toggleSidenav('left');
      } 

}

:

<body layout="column" ng-controller="AppCtrl as vm">

vm ( , vm). ( ): -

<md-item ng-repeat="it in vm.helpInfo">

<--- some code -->

 <md-button ng-click="vm.selectHelpInfo(it)" 
            ng-class="{'selected' : it === vm.selected }">
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