Javascript ngIf不';t评估异步代码和Firebase
我的AuthService中有一个属性,它告诉您是否登录Javascript ngIf不';t评估异步代码和Firebase,javascript,angular,firebase,firebase-authentication,Javascript,Angular,Firebase,Firebase Authentication,我的AuthService中有一个属性,它告诉您是否登录 export class AuthService { token: string; isLogIn = new Subject<boolean>(); 在我的HeaderComponent中,我有: export class HeaderComponent implements OnInit { isActivated = false; constructor(private authService: Aut
export class AuthService {
token: string;
isLogIn = new Subject<boolean>();
在我的HeaderComponent中,我有:
export class HeaderComponent implements OnInit {
isActivated = false;
constructor(private authService: AuthService) { }
ngOnInit() {
this.authService.isLogIn.asObservable().subscribe(
(data: boolean) => {
this.isActivated = data;
}
);
// this.isActivated = this.authService.isLogin();
}
}
模板:
<ng-template [ngIf]="!isActivated">
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/login"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Ingresar
</a>
</ng-template>
<ng-template [ngIf]="isActivated">
<!--DROPDOWN PROFILE-->
<div class="btn-group" role="group" *ngIf="authService.user">
<button id="btnGroupDrop1" type="button" class="btn btn-light dropdown-toggle pointer" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
{{authService.user.displayName}}
</button>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="btnGroupDrop1">
<a class="dropdown-item" href="#">Dropdown link</a>
<a class="dropdown-item" href="#">Dropdown link</a>
</div>
</div>
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/dashboard"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Dashboard
</a>
</ng-template>
AppComponent.ts
import {Component, OnInit} from '@angular/core';
import * as firebase from 'firebase';
import {AuthService} from './public/services/auth.service';
import {User} from "./auth/models/user.model";
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
isLoading = true;
constructor(private authService: AuthService) {}
ngOnInit() {
// this.authService.isLogIn.next(localStorage.length > 0);
firebase.auth().onIdTokenChanged(
(data) => {
console.log('TOKEN HAS CHANGED', data);
if(data) {
data.getIdToken().then(
(tk) => {
this.authService.token = tk;
}
);
} else {
console.log('You don\'t have a token yet, please login...');
// TODO this means that the user is new or have logout.
}
}
);
firebase.auth().onAuthStateChanged((user) => {
if (user) {
// User is signed in.
this.authService.user = new User(user.displayName, user.email, user.photoURL, user.uid);
console.log(user);
this.isLoading = false;
this.authService.isLogIn.next(true);
} else {
// No user is signed in.
console.error('no user is login');
this.authService.isLogIn.next(false);
}
});
// check localstorage, so we can see if there is a logged user
if (this.authService.getLocalUserInfo()) {
this.authService.isLogIn.next(true);
} else {
this.authService.isLogIn.next(false);
}
}
}
AppComponent模板:
<div>
<app-header></app-header>
</div>
<div>
<router-outlet></router-outlet>
</div>
AppHeader模板
<nav class="navbar navbar-expand-lg navbar-dark bg-custom-nav px-5">
<a class="navbar-brand" routerLink="/">MovieApp</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="container-fluid">
<div class="collapse navbar-collapse d-lg-flex justify-content-lg-between row" id="navbarNavAltMarkup">
<div class="navbar-nav px-sm-4 px-lg-0">
<a class="nav-item nav-link text-white"
routerLink="/"
routerLinkActive="active font-weight-bold"
[routerLinkActiveOptions]="{exact: true}">Inicio</a>
</div>
<div class="col-lg-8">
<app-search-bar></app-search-bar>
</div>
<div class="row">
<ng-template [ngIf]="!isActivated">
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/login"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Ingresar
</a>
</ng-template>
<ng-template [ngIf]="isActivated">
<!--DROPDOWN PROFILE-->
<div class="btn-group" role="group" *ngIf="authService.user">
<button id="btnGroupDrop1" type="button" class="btn btn-light dropdown-toggle pointer" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
{{authService.user.displayName}}
</button>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="btnGroupDrop1">
<a class="dropdown-item" href="#">Dropdown link</a>
<a class="dropdown-item" href="#">Dropdown link</a>
</div>
</div>
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/dashboard"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Dashboard
</a>
</ng-template>
</div>
</div>
</div>
</nav>
还有一件事,我使用了异步管道,但模板没有反映这些变化。在github项目中,您会发现我在模板中使用了async,但仍然存在相同的错误。我希望有人能帮助我。我将尝试帮助/回答,请注意,有很多代码需要筛选,因此我可能遗漏了一些明显的内容。无论如何,为了整理代码并为您指明正确的方向,您可能需要查看AsyncPipe
我想首先修改您的AuthService,通过改变isLogIn=newsubject()
toprivate\u isLogIn=new Subject()代码>。我们不想将主题共享给其他将修改它的组件,因此在AuthService中的任何地方,您都只需要添加下划线。。。最后,要导出要使用的主题,我们可以添加如下get函数:
get isLogIn(): Observable<boolean> {
return this._isLogIn.asObservable();
}
export class HeaderComponent implements OnInit {
constructor(private authService: AuthService) { }
ngOnInit() {}
get isActivated(): Observable<boolean> {
return this.authService.isLogIn;
}
}
现在,如果我要编写您的header.component.ts
,我会这样做:
get isLogIn(): Observable<boolean> {
return this._isLogIn.asObservable();
}
export class HeaderComponent implements OnInit {
constructor(private authService: AuthService) { }
ngOnInit() {}
get isActivated(): Observable<boolean> {
return this.authService.isLogIn;
}
}
导出类HeaderComponent实现OnInit{
构造函数(私有authService:authService){}
ngOnInit(){}
get isActivated():可观察{
返回this.authService.isLogIn;
}
}
所以这里我只是用一个get函数直接将可观测数据传递给我们的模板。因此,在模板中,我将实现AsyncPipe,如下所示:
<div *ngIf="!(isActivated | async) else user">
<a class="nav-item nav-link text-white anchor-hover" routerLink="/login"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Ingresar
</a>
</div>
<ng-template #user>
<!--DROPDOWN PROFILE-->
<div class="btn-group" role="group" *ngIf="authService.user">
<button id="btnGroupDrop1" type="button" class="btn btn-light dropdown-toggle pointer" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
{{authService.user.displayName}}
</button>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="btnGroupDrop1">
<a class="dropdown-item" href="#">Dropdown link</a>
<a class="dropdown-item" href="#">Dropdown link</a>
</div>
</div>
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/dashboard"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Dashboard
</a>
</ng-template>
我将尝试帮助/回答,请注意,有很多代码需要筛选,因此我可能遗漏了一些明显的内容。无论如何,为了整理代码并为您指明正确的方向,您可能需要查看AsyncPipe
我想首先修改您的AuthService,通过改变isLogIn=newsubject()
toprivate\u isLogIn=new Subject()代码>。我们不想将主题共享给其他将修改它的组件,因此在AuthService中的任何地方,您都只需要添加下划线。。。最后,要导出要使用的主题,我们可以添加如下get函数:
get isLogIn(): Observable<boolean> {
return this._isLogIn.asObservable();
}
export class HeaderComponent implements OnInit {
constructor(private authService: AuthService) { }
ngOnInit() {}
get isActivated(): Observable<boolean> {
return this.authService.isLogIn;
}
}
现在,如果我要编写您的header.component.ts
,我会这样做:
get isLogIn(): Observable<boolean> {
return this._isLogIn.asObservable();
}
export class HeaderComponent implements OnInit {
constructor(private authService: AuthService) { }
ngOnInit() {}
get isActivated(): Observable<boolean> {
return this.authService.isLogIn;
}
}
导出类HeaderComponent实现OnInit{
构造函数(私有authService:authService){}
ngOnInit(){}
get isActivated():可观察{
返回this.authService.isLogIn;
}
}
所以这里我只是用一个get函数直接将可观测数据传递给我们的模板。因此,在模板中,我将实现AsyncPipe,如下所示:
<div *ngIf="!(isActivated | async) else user">
<a class="nav-item nav-link text-white anchor-hover" routerLink="/login"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Ingresar
</a>
</div>
<ng-template #user>
<!--DROPDOWN PROFILE-->
<div class="btn-group" role="group" *ngIf="authService.user">
<button id="btnGroupDrop1" type="button" class="btn btn-light dropdown-toggle pointer" data-toggle="dropdown" aria-haspopup="true" aria-expanded="true">
{{authService.user.displayName}}
</button>
<div class="dropdown-menu dropdown-menu-right" aria-labelledby="btnGroupDrop1">
<a class="dropdown-item" href="#">Dropdown link</a>
<a class="dropdown-item" href="#">Dropdown link</a>
</div>
</div>
<a class="nav-item nav-link text-white anchor-hover"
routerLink="/dashboard"
routerLinkActive="active font-weight-bold">
<i class="fa fa-sign-in pr-2" aria-hidden="true"></i>Dashboard
</a>
</ng-template>
您还可以在AuthService中处理firebase.auth().onAuthStateChanged
,然后在AppModule的构造函数中实例化该服务。我没有注意到您在AuthService中没有这样做。我已经按照您的步骤进行了操作,但是现在如何将值设置为isLogIn?使用set?我不知道您是否看到了我的评论,但我没有注意到您没有在authservice中查看用户状态,因此我建议您将其移动到那里。(参见上面的评论)我已经将firebase逻辑更改为AuthService,并从AppModule调用它,但在标题中我仍然看不到与ngIf相关的元素。如果你想,我无法在github上创建一个repo并与你共享。我想你的意思是说你可以与我共享该repo,所以请,我将尽最大努力提供帮助。此外,你还可以在AuthService中处理firebase.auth().onAuthStateChanged
,然后在AppModule的构造函数中实例化该服务。我没有注意到您在AuthService中没有这样做。我已经按照您的步骤进行了操作,但是现在如何将值设置为isLogIn?使用set?我不知道您是否看到了我的评论,但我没有注意到您没有在authservice中查看用户状态,因此我建议您将其移动到那里。(参见上面的评论)我已经将firebase逻辑更改为AuthService,并从AppModule调用它,但在标题中我仍然看不到与ngIf相关的元素。如果你想,我不能在github上创建回购协议并与你共享。我想你的意思是说你可以与我共享回购协议,所以请,我会尽最大努力帮助你。