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ユーザーがログインしているときにのみナビゲーションバーを表示したいので、コンポーネントがサービスからログに記録されたユーザーを取得したときにイベントを発生させようとしています。

ここに私の app.component コードがあります:

import { Component, OnInit, EventEmitter, Input, Output } from '@angular/core';
import { ROUTER_DIRECTIVES, Router } from '@angular/router';
import { LoginComponent } from './login.component';
import { DashboardComponent } from './dashboard.component';
import { ControlDetailComponent } from './control-detail.component';
import { PageNotFoundComponent } from './pagenotfound.component';
import { SettingsComponent } from './settings.component';
import { UserService } from '../service/user.service';
import { User } from '../object/user';

@Component({
    selector: 'myApp',
    templateUrl: './app/template/app.component.html',
    styleUrls: ['styles.css'],
    directives: [ROUTER_DIRECTIVES],
    precompile: [LoginComponent, DashboardComponent, ControlDetailComponent, PageNotFoundComponent, SettingsComponent]
})
export class AppComponent {
    @Input() loggedUser:User;
    @Output() userChanged:EventEmitter<User> =  new EventEmitter<User>();

    constructor(private _userService:UserService, private _router:Router) {}

    ngAfterViewInit() { 
        if(this._userService.isUserLogged()) {
           this.userChanged.emit(this._userService.loggedUser);
       }
    }

    switchUser(event) {
        this.loggedUser = event.target.value;
        console.log("event triggered");
    }
}


そして、これは関連するテンプレートです:

<div class="all-content">
<nav (userChanged)="switchUser($event)" *ngIf="loggedUser">
    <ul>
        <a [routerLink]="['/dashboard']" routerLinkActive="active">Dashboard</a>
        <a [routerLink]="['/settings']" routerLinkActive="active">Settings</a>
        <a (click)="logout()">Logout</a>
    </ul>
</nav>


私のイベントが発生しない理由を誰かが知っていますか?

最初は問題は*ngIfイベントの発生を妨げていたディレクティブだと思っていましたが、それを削除してもイベントは発生しません...

4

2 に答える 2

3

Günter Zöchbauer が提案したように、Observablesと aを使用して解決しました (ありがとう!)。Service

私のソリューションの下：

user.service.ts

import { Injectable } from '@angular/core';
import { Http, Response } from '@angular/http';
import { Observable } from 'rxjs/Rx';
import { Subject }    from 'rxjs/Subject';
import { Control } from '../object/control';
import { User } from '../object/user';


@Injectable()
export class UserService {
    private userChangedSource = new Subject<User>();
    userChanged = this.userChangedSource.asObservable();
    loggedUser:User;

    userLoggedIn(user:User) {
        this.loggedUser = user;
        this.userChangedSource.next(user);
    }

    ...
}

app.component.ts

import { Component, OnInit, EventEmitter, Input, Output } from '@angular/core';
import { Observable } from 'rxjs/Observable';
import { ROUTER_DIRECTIVES, Router } from '@angular/router';
import { LoginComponent } from './login.component';
import { DashboardComponent } from './dashboard.component';
import { ControlDetailComponent } from './control-detail.component';
import { PageNotFoundComponent } from './pagenotfound.component';
import { SettingsComponent } from './settings.component';
import { UserService } from '../service/user.service';
import { User } from '../object/user';

@Component({
    selector: 'myApp',
    templateUrl: './app/template/app.component.html',
    styleUrls: ['styles.css'],
    directives: [ROUTER_DIRECTIVES],
    precompile: [LoginComponent, DashboardComponent, ControlDetailComponent, PageNotFoundComponent, SettingsComponent]
})
export class AppComponent implements OnInit {
    loggedUser:User;

    constructor(private _userService:UserService, private _router:Router) { 
        this._userService.userChanged.subscribe(user => {
                this.loggedUser = user;
                console.log("event triggered");
        });
    }
    ...
}

app.component.html

<div class="all-content">
    <nav *ngIf="loggedUser" >
        <ul>
            <a [routerLink]="['/dashboard']" routerLinkActive="active">Dashboard</a>
            <a [routerLink]="['/settings']" routerLinkActive="active">Settings</a>
            <a (click)="logout()">Logout</a>
        </ul>
    </nav>
<router-outlet></router-outlet>
<br/>
</div>
于 2016-08-01T14:38:22.780 に答える