[英]angular2 - Service value not changing
我有一条叫做家的路线,它有三个子路线,文件,邮件和垃圾箱。 在本地路由组件中,它具有一个名为“ myUser”的变量。 我创建了一个服务,以便他们都可以共享myUser值,但是由于某些原因,服务变量值不会更改。
服务
import { Injectable } from '@angular/core';
import { Subscription } from 'rxjs/Subscription';
@Injectable()
export class HomeService {
// Mock user, for testing
myUser = {name:"John", loggedIn:true};
setUser(name:string){
this.myUser.name = name ;
}
isLogged():boolean {
if(this.myUser.loggedIn == true){
return true ;
}
return false ;
}
}
家(父路线)
import { Component } from '@angular/core';
import { Router, ROUTER_DIRECTIVES } from '@angular/router';
import { CORE_DIRECTIVES, FORM_DIRECTIVES } from '@angular/common';
import { Http, Headers } from '@angular/http';
import { contentHeaders } from '../common/headers';
import { HomeService } from '../../home.service';
const template = require('./home.component.html');
const styles = require('./home.component.css');
@Component({
selector: 'home',
directives: [ CORE_DIRECTIVES, FORM_DIRECTIVES ],
template: template,
styles: [ styles ],
providers: [HomeService]
})
export class HomeComponent {
constructor(public router: Router, private homeService: HomeService) {
}
myUser = this.homeService.myUser ;
setUser(name:string){
this.homeService.setUser(name);
}
// Is logged in
isLogged():boolean {
return this.homeService.isLogged();
}
}
邮件(子路线)
import { Component } from '@angular/core';
import { Router } from '@angular/router';
import { CORE_DIRECTIVES, FORM_DIRECTIVES } from '@angular/common';
import { HomeService } from '../../home.service';
const template = require('./mail.component.html');
const styles = require('./mail.component.css');
@Component({
selector: 'mail',
directives: [ CORE_DIRECTIVES, FORM_DIRECTIVES ],
template: template,
styles: [ styles ],
providers: [HomeService]
})
export class MailComponent {
constructor(public router: Router, private homeService: HomeService) {
}
myUser = this.homeService.myUser ;
setUser(name:string){
this.homeService.setUser(name);
}
}
您必须将HomeService
注入到Dependency数组或MainComponent
提供bootstrap
功能中,以便该服务仅实例化一次。
bootstrap(MainComponent, [HomeService, ....other dependency...])
然后从两个组件元数据的providers
数组中删除HomeService
。
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