[英]unable to hide header and footer from login page using angular
在這里我的問題是我無法從登錄頁面隱藏 header 和頁腳。 在這里,我在 app.html 和登錄頁面和主頁中有一個常見的 header 和頁腳。 沒有登錄它不必顯示導航但我仍然在身份驗證之前獲得導航
下面是我的代碼
<nav class="navbar navbar-toggleable-md navbar fixed-top" style="background-color:grey">
<div class="container">
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="nav navbar-nav navbar-right landing-nav-text ul-right">
<li class="active"><a href="#about">About <span class="sr-only">(current)</span></a></li>
<li><a href="#features">Features</a></li>
<li><a href="#info">info</a></li>
<li><a href="#demo">Demo</a></li>
<li><a href="#demo1">Demo1</a></li>
<li><a href="#demo2">Demo2</a></li>
<li><a href="#demo3">Demo3</a></li>
</ul>
</div>
</div>
<a (click)="Logout()" class="logout">
Logout
</a>
</nav>
<router-outlet><router-outlet>
<div class="footer">
<div class="main_content">
<div class="footer_links_end">
<p>This is footer</p>
<p>
<a href="https://twitter.com">Twitter</a>
<a href="https://www.linkedin.com">Linkedin</a>
</p>
</div>
</div>
</div>
請檢查此堆棧是否有問題
使用ngIf
:
為此,您必須使用@ angular / router中的Router 。
Component.ts:
import { Router } from "@angular/router";
...
constructor(public router: Router){} // note you have to use Public because you are using it in html file too.
Component.html:
<nav *ngIf="router.url !== '/login' && router.url !== '/signup'"> // or maybe only 'login'
</nav>
注意:如果您對標題( <app-header>
)和頁腳( <app-footer>
)使用不同的組件,則也可以對它們使用* ngIf。
2項更改可以幫助您實現這一目標...
/* APP.COMPONENT.TS */ hideName:boolean =true; constructor(public _authService:AuthService,public router:Router){ if(this._authService.getUser() == ''){ this.hideName = false; } else { this.hideName =true; } }
<!-- Added *ngIf="hideName" to app.component.html --> <nav class="navbar navbar-toggleable-md navbar fixed-top" style="background-color:grey" *ngIf="hideName">
因為在app.component.html(用於顯示插座的頁面)中,您將直接插入代碼:
< Your header code >
....
<router-outlet></router-outlet>
....
< Your footer code >
解決方案是:
例如: https : //stackblitz.com/edit/angular-uhvgjm (我已經做了一些工作,當您想要顯示頁眉和頁腳時,需要繼續進行操作)
您可以使用帶有主題的可注射 class 並將您需要的任何內容從您想要的任何事件推送到 header
import {EventEmitter, Injectable} from '@angular/core';
import {Subject, Observable} from 'rxjs';
@Injectable({
providedIn: 'root'
})
export class HeaderManagerService {
private headerStatus = new Subject<any>();
constructor() {
}
changeHeader(showHeader: boolean, rightBtn: string | undefined, onRightBtn: EventEmitter<boolean> | undefined, onLeftBtn: EventEmitter<boolean> | undefined) {
this.headerStatus.next({showHeader, rightBtn, onRightBtn, onLeftBtn});
}
getHeaderStatus(): Observable<any> {
return this.headerStatus.asObservable();
}
}
在你的 NavComponent
protected onDestroy = new Subject<void>();
showHeader = true;
rightBtn: string | undefined;
onRightBtn: EventEmitter<boolean> | undefined;
onLeftBtn: EventEmitter<boolean> | undefined;
constructor(private headerManager: HeaderManagerService,
private router: Router) {
}
ngOnDestroy(): void {
this.onDestroy.next();
this.onDestroy.complete();
}
ngOnInit(): void {
this.router.events
.pipe(filter(navigation => navigation instanceof NavigationEnd))
.subscribe((s: any) => {
this.showHeader = true;
this.rightBtn = undefined;
this.onRightBtn = undefined;
this.onLeftBtn = undefined;
});
this.headerManager.getHeaderStatus()
.pipe(
skipWhile(val => !val),
takeUntil(this.onDestroy)
)
.subscribe(({showHeader, rightBtn, onRightBtn, onLeftBtn}) => {
this.showHeader = showHeader;
this.rightBtn = rightBtn;
this.onRightBtn = onRightBtn;
this.onLeftBtn = onLeftBtn;
});
}
在 nav.component.html
<nav *ngIf="showHeader">
some header
</nav>
<nav *ngIf="!showHeader"> <!--or ignore this element-->
<div class="d-flex">
<button (click)="onLeftBtn?.emit(true)">back</button>
<div class="flex-grow-1"></div>
<div (click)="onRightBtn?.emit(true)" [innerHTML]="rightBtn ?? ''"></div>
</div>
</nav>
並從您的頁面推送一些更改到 header
constructor(private headerManager: HeaderManagerService) {
}
onLeftBtn = new EventEmitter<boolean>();
onRightBtn = new EventEmitter<boolean>();
ngOnInit(): void {
this.headerManager.changeHeader(false,
'<img class="word-arrow mb-4" src="assets/img/myimage.jpg">',
this.onRightBtn,
this.onLeftBtn);
this.onLeftBtn.subscribe((value) => {
console.log('onLeftBtn');
});
this.onRightBtn.subscribe((value) => {
console.log('onRightBtn');
});
}
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