Javascript 将变量值传递给app.component的角度服务
我有一个服务,其中包含一个名为url的变量 代码如下:Javascript 将变量值传递给app.component的角度服务,javascript,angular,Javascript,Angular,我有一个服务,其中包含一个名为url的变量 代码如下: //service.ts import { Injectable } from '@angular/core'; import { Http, Response } from '@angular/http'; import { Observable } from 'rxjs/Observable'; import 'rxjs/add/operator/map'; import 'rxjs/add/operator/do'; impor
//service.ts
import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/operator/map';
import 'rxjs/add/operator/do';
import 'rxjs/add/operator/catch';
@Injectable()
export class DataService {
private url = 'http://someurl.com/';
constructor (private _http:Http){}
getDataHttp():Observable<any> {
return this._http.get(this.url)
.map((response: Response) => <any> response.json())
.do(data => console.log('All: ' + JSON.stringify(data)))
.catch(this.handleError);
}
private handleError(error: Response) {
console.error(error);
return Observable.throw(error.json().error || 'Server error');
}
}
//service.ts
从“@angular/core”导入{Injectable};
从'@angular/Http'导入{Http,Response};
从“rxjs/Observable”导入{Observable};
导入'rxjs/add/operator/map';
导入'rxjs/add/operator/do';
导入“rxjs/add/operator/catch”;
@可注射()
导出类数据服务{
专用url=http://someurl.com/';
构造函数(私有http:http){}
getDataHttp():可观察{
返回此。\u http.get(this.url)
.map((response:response)=>response.json())
.do(data=>console.log('All:'+JSON.stringify(data)))
.接住(这个.把手错误);
}
私有句柄错误(错误:响应){
控制台错误(error);
返回Observable.throw(error.json().error | |'Server error');
}
}
下面是我要从服务调用url变量的文件:
// app.component.ts
import { Component, OnInit } from '@angular/core';
import { DataService } from './data.service';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
errorMessage;
data;
constructor(private service:DataService) {}
ngOnInit() {
this.service.getDataHttp()
.subscribe(data => this.data = data,
error => this.errorMessage = <any>error);
}
}
//app.component.ts
从“@angular/core”导入{Component,OnInit};
从“./data.service”导入{DataService};
@组成部分({
选择器:'应用程序根',
templateUrl:“./app.component.html”,
样式URL:['./app.component.css']
})
导出类AppComponent实现OnInit{
错误信息;
数据;
构造函数(私有服务:数据服务){}
恩戈尼尼特(){
this.service.getDataHttp()
.subscribe(data=>this.data=data,
error=>this.errorMessage=error);
}
}
我的问题是。。。如何将url值从service.ts传递到app.component.ts?例如,将getter/setter方法添加到
DataService
:
public getUrl(){
return this.url;
}
public setUrl(url:string){
this.url = url;
return this.url;
}
然后从AppComponent
中这样调用它们:
let url = this.service.getUrl();
要检索该值,请执行以下操作:
this.service.setUrl(another_url);
设置它。创建getter和setter。