角度6材质:材质选项卡链接由下划线栏选择

我有一个 mat-tab-nav-bar 我的网站的导航栏,但 mat-tab-link 蓝色下划线栏不会追踪活动按钮。它只停留在第一个按钮上,不动。这些按钮确实会变为活动状态,尽管背景颜色会发生变化,它们会很好地传送到相应的页面。

这是 app.component.ts :

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
  navLinks = [
    { path: '', label: 'The Problem' },
    { path: 'the-solution', label: 'The Solution' },
    { path: 'the-game', label: 'The Game' },
    { path: 'probability-calculator', label: 'Probability calculator' },
  ];
}

下面是 app.component.html :

<nav mat-tab-nav-bar>
  <a mat-tab-link
     *ngFor="let link of navLinks"
     [routerLink]="link.path"
     routerLinkActive #rla="routerLinkActive"
     [active]="rla.isActive">
    {{link.label}}
  </a>
</nav>

<router-outlet></router-outlet>

这是 app.module.ts :

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { MatTabsModule } from '@angular/material/tabs';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

import { AppRoutingModule } from './app-routing.module';

import { AppComponent } from './app.component';
import { TheProblemComponent } from './the-problem/the-problem.component';
import { TheSolutionComponent } from './the-solution/the-solution.component';
import { ProbabilityCalculatorComponent } from './probability-calculator/probability-calculator.component';
import { TheGameComponent } from './the-game/the-game.component';

@NgModule({
  declarations: [
    AppComponent,
    TheProblemComponent,
    TheSolutionComponent,
    ProbabilityCalculatorComponent,
    TheGameComponent
  ],
  imports: [
    AppRoutingModule,
    BrowserModule,
    BrowserAnimationsModule,
    MatTabsModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

我错过了什么?非常感谢。

编辑

我编辑了 应用程序。组成部分html 如需了解有关链接“活动”状态的更多信息,请执行以下操作:

<nav mat-tab-nav-bar>
  <a mat-tab-link
     *ngFor="let link of navLinks"
     [routerLink]="link.path"
     routerLinkActive #rla="routerLinkActive"
     [active]="rla.isActive">
    {{link.label}}
    <div style="color: red; margin-left: 10px;">
        <span *ngIf="rla.isActive"> Is active!</span>
        <span *ngIf="!rla.isActive"> Is not active...</span>
    </div>
  </a>
</nav>

<router-outlet></router-outlet>

事实证明,菜单中的第一个链接始终保持活动状态( rla.isActive )-当我导航到其他页面时也是如此。所有其他链接都会很好地关闭其活动状态,并且只有在导航到它们时才会被激活。导航到其他链接时,如何关闭第一个链接的活动状态?

编辑2

正在添加 app-routing.module.ts 代码:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';

import { TheProblemComponent } from './the-problem/the-problem.component';
import { TheSolutionComponent } from './the-solution/the-solution.component';
import { TheGameComponent } from './the-game/the-game.component';
import { ProbabilityCalculatorComponent } from './probability-calculator/probability-calculator.component';

const routes: Routes = [
    { path: '', component: TheProblemComponent },
    { path: 'the-solution', component: TheSolutionComponent },
    { path: 'the-game', component: TheGameComponent },
    { path: 'probability-calculator', component: ProbabilityCalculatorComponent }
];


@NgModule({
  imports: [ RouterModule.forRoot(routes) ],
  exports: [ RouterModule ]
})
export class AppRoutingModule { }