Angular 2 – 链接可观察订阅

以下代码适用于Chrome,但不适用于Firefox和IE.

下面这样做的正确方法是什么？我需要获取用户的当前位置,然后将其传递给第二个调用(getTiles).

我没有在Web开发浏览器工具中看到任何错误.
这也是我在localhost上运行的时候.该网站尚未部署.我不确定这是否相关.

我正在使用Angular 2.0.0-rc.2.

ngOnInit(): void {

       this._LocationService.getLocation().subscribe(
           location => {this.location = location;

                    // make the next call using the result of the first observable 
                   this._TilesService.getTiles(0,location).subscribe(
                        tiles => {this.tiles = tiles; this.index = 1;},error =>  this.errorMessage = <any>error);                
            });    
}

这是位置服务……

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { Observer } from 'rxjs/Observer';

import { ILocation } from '../interfaces/location';

@Injectable()
export class LocationService {

    constructor() { }

    getLocation(): Observable<ILocation> {

      let locationObservable = new Observable<ILocation>((observer: Observer<ILocation>) => {

            if (navigator.geolocation) {

                var positionOptions = {
                    enableHighAccuracy: false,timeout: 1000,maximumAge: 5000
                };

                navigator.geolocation.getCurrentPosition(function (position) {

                    var location: ILocation = {
                        Longitude: position.coords.longitude,Latitude: position.coords.latitude
                    };

                    observer.next(location);
                },this.locationErrorHandler,positionOptions);
            }
        });

        return locationObservable;
    }

   locationErrorHandler(error:any) { }
}

这是getTiles服务……

import { Injectable } from '@angular/core';
import { Http,Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';

import { ITile } from '../interfaces/tile';
import { ILocation } from '../interfaces/location';

@Injectable()
export class TilesService {

    constructor(private _http: Http) { }

    getTiles(index: number,location: ILocation): Observable<ITile[]> {  
      this._tileUrl = 'SOME URL';

      return this._http.get(this._tileUrl)
            .map((response: Response) => <ITile[]> response.json())
            .catch(this.handleError);
    }

    private handleError(error: Response) {
        console.error(error);
        return Observable.throw(error.json().error || 'Server error');
    }
}