Angular2:使用路线,成功登录后如何显示导航栏? [英] Angular2: Using routes, how to display the navigation bar after successfully logged in?
问题描述
一旦用户成功执行操作,我将尝试显示导航栏.
I'm trying to show the navigation bar, once the user successfully do.
例如:
如何在"LoginComponent"内的"AppComponent"中更改"showMenu"属性?重要提示:我正在使用路线.
How To Change "showMenu" property in "AppComponent" inside the "LoginComponent"? Important: I am using routes.
app.ts:
@Component({
selector: 'app',
template: `<div *ngIf="showMenu">
<fnd-menu-nav></fnd-menu-nav>
</div>
<router-outlet></router-outlet>
`,
directives: [ROUTER_DIRECTIVES, MenuNavComponent]
})
@RouteConfig([
{ path: '/login', name: 'Login', component: LoginComponent, useAsDefault: true },
{ path: '/welcome', name: 'Welcome', component: WelcomeComponent }
])
export class AppComponent {
public showMenu : boolean;
}
login.component.ts:
login.component.ts:
@Component({
selector: 'fnd-login',
templateUrl: './fnd/login/components/login.component.html',
providers: [LoginService]
})
export class LoginComponent {
/* .. other properties */
constructor(private _router: Router, private _loginService: LoginService ) {
}
/* .. other methods */
/* .. other methods */
private onLoginSuccessfully(data : any) : void {
/* --> HERE: Set showMenu in AppComponent to true. How? */
this._router.navigate(['Welcome']);
}
}
还是这种设计不是解决它的最佳方法?
Or this design is not the best way to solve it?
推荐答案
我最近做了类似的事情,这就是我的做法.首先,您需要在应用程序的根目录下创建一个NavBarComponent.在NavBarComponent中,您引用(我称之为)GlobalEventsManager,这是一种您在需要的地方注入的服务.
I recently did something similar and here is how I did it. First, you need to create a NavBarComponent at the root of your app. And in the NavBarComponent you reference (what I call) a GlobalEventsManager which is a service that you inject where you need it.
这里是GlobalEventsManager的一个例子:
Here is a look at the GlobalEventsManager:
import { Injectable } from '@angular/core';
import { BehaviorSubject } from "rxjs/BehaviorSubject";
import { Observable } from "rxjs/Observable";
@Injectable()
export class GlobalEventsManager {
private _showNavBar: BehaviorSubject<boolean> = new BehaviorSubject<boolean>(false);
public showNavBarEmitter: Observable<boolean> = this._showNavBar.asObservable();
constructor() {}
showNavBar(ifShow: boolean) {
this._showNavBar.next(ifShow);
}
}
现在您将GlobalEventsManger服务注入到您的登录组件中(类似这样)
Now you inject the GlobalEventsManger service into your login component (something like this)
import {GlobalEventsManager} from "./../GlobalEventsManager";
@Component({
selector: 'fnd-login',
templateUrl: './fnd/login/components/login.component.html',
providers: [LoginService]
})
export class LoginComponent {
/* .. other properties */
constructor(private _router: Router, private _loginService: LoginService, private globalEventsManager: GlobalEventsManager) {
}
/* .. other methods */
/* .. other methods */
private onLoginSuccessfully(data : any) : void {
/* --> HERE: you tell the global event manger to show the nav bar */
this.globalEventsManger.showNavBar(true);
this._router.navigate(['Welcome']);
}
}
在您的NavBarComponent中,您订阅了showNavBar事件发射器:
In your NavBarComponent you subscribe to the showNavBar Event Emitter:
import {Component, OnInit} from "@angular/core";
import {GlobalEventsManager} from "../GlobalEventsManager";
@Component({
selector: "navbar",
templateUrl: "app/main/topNavbar/TopNavbar.html"
})
export class TopNavbarComponent {
showNavBar: boolean = false;
constructor(private globalEventsManager: GlobalEventsManager) {
this.globalEventsManager.showNavBarEmitter.subscribe((mode)=>{
this.showNavBar = mode;
});
}
}
在模板HTML中使用* ngIf ="showNavBar"隐藏/显示导航栏.
use *ngIf="showNavBar" in the template HTML to hide/show the Nav bar.
您的应用程序组件如下所示:
Your app component then looks something like this:
@Component({
selector: 'app',
template: `<navbar></navbar>
<router-outlet></router-outlet>
`
})
export class AppComponent {
//This doesn't belong here --> public showMenu : boolean;
}
启动应用程序时,还必须注册GlobalEventsManager:
Also the GlobalEventsManager must be registered when you boot the app:
import { GlobalEventsManager } from './GlobalEventsManager';
import { TopNavbarComponent } from './TopNavbarComponent';
@NgModule({
bootstrap: [App],
declarations: [
App,
TopNavbarComponent
],
imports: [
BrowserModule
],
providers: [GlobalEventsManager]
})
export class AppModule {
}
应该这样做.
更新:我已经更新了此答案,以反映使用组件外部(即服务中)的事件的更可接受的方式;这需要使用BehaviorSubject/Observable代替EventEmitter
UPDATE: I have updated this answer to reflect the more accepted way of using events outside of a component, ie in a service; which entails using BehaviorSubject/Observable instead of EventEmitter
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