html - angular 2 - 如何在某些组件中隐藏导航栏

Question

我在 nav.component.html 中单独创建了导航栏，如何在某些组件(如 login.component)中隐藏导航栏。

nav.component.html

<nav class="navbar navbar-default navbar-fixed-top navClass">
    <div class="container-fluid">
        <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed"
                        (click)="toggleState()">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>

        </div>
         <div class="collapse navbar-collapse"
              [ngClass]="{ 'in': isIn }">
          enter code here   <ul class="nav navbar-nav">
               <li class="active"><a href="#">Home</a></li>
               <li><a href="#">about</a></li>

            </ul>

        </div>
    </div>
</nav>

Answer 1

Navbar 控件和格式化在整个应用程序中经常需要，因此 NavbarService 很有用。在需要的地方注入(inject)那些组件。

导航栏.服务.ts:

import { Injectable } from '@angular/core';

@Injectable()
export class NavbarService {
  visible: boolean;

  constructor() { this.visible = false; }

  hide() { this.visible = false; }

  show() { this.visible = true; }

  toggle() { this.visible = !this.visible; }

  doSomethingElseUseful() { }

  ...
}

navbar.component.ts:

import { Component } from '@angular/core';
import { NavbarService } from './navbar.service';

@Component({
  moduleId: module.id,
  selector: 'sd-navbar',
  templateUrl: 'navbar.component.html'
})

export class NavbarComponent {

  constructor( public nav: NavbarService ) {}
}

navbar.component.html:

<nav *ngIf="nav.visible">
 ...
</nav>

example.component.ts:

import { Component, OnInit } from '@angular/core';
import { NavbarService } from './navbar.service';

@Component({
})
export class ExampleComponent implements OnInit {

  constructor( public nav: NavbarService ) {}
}
ngOnInit() {
  this.nav.show();
  this.nav.doSomethingElseUseful();
}