将param传递给服务

Question

我正在构建我的api服务。我希望它是普遍的。如何在提供者的定义中定义apiUrl？

这里是我的服务：

import {Injectable} from "@angular/core"; 
import {Http, Response} from "@angular/http"; 
import '/js/admin/rxjs-operators'; 
import {Observable} from "rxjs"; 
@Injectable() 
export class ApiService { 
    private apiUrl: string = 'http://www.system.local/api/'; 

    constructor(private http: Http, private apiUrl: string) { 
    } 

    get(url: string, params): Observable<Response> { 
     let requestUrl: string = this.apiUrl + url + this.parseParams(params); 
     return this.http.get(requestUrl) 
      .map(response => response.json()); 
    } 

    post(url: string, params): Observable<any> { 
     let requestUrl: string = this.apiUrl + url; 
     return this.http.post(requestUrl, params) 
      .map(response => response.json()); 
    } 
} 

我与服务提供商尝试，但似乎deps必须是一流的：

import {ApiService} from "./api.service"; 
import {Http} from "@angular/http"; 
let apiServiceFactory = (http: Http, apiUrl: string)=> { 
    return new ApiService(http, apiUrl); 
}; 

export let apiServiceProvider = { 
    provide: ApiService, 
    useFactory: apiServiceFactory, 
    deps: [Http, 'http://www.wp.pl'] 
}; 

，并在模块： @NgModule（{ 提供商：[ apiServiceProvider ] }）

Answer 1

不要定义字符串作为一个依赖，而看看Non-class dependencies和Value providers：

https://angular.io/docs/ts/latest/guide/dependency-injection.html#!#non-class-dependencies

https://angular.io/docs/ts/latest/guide/dependency-injection.html#!#value-provider

然后您将使用OpaqueToken持有字符串变量：

https://angular.io/docs/ts/latest/guide/dependency-injection.html#!#opaquetoken

https://angular.io/docs/ts/latest/api/core/index/OpaqueToken-class.html