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angular - Angular 6 Material：mat-tab-link 通过下划线栏选择

问题描述

我的网站有一个mat-tab-nav-bar导航栏，但mat-tab-link蓝色下划线栏不会追逐活动按钮。它只是停留在第一个按钮上，不会移动。尽管背景颜色发生了变化，但按钮确实会变为活动状态，并且它们可以很好地路由到相应的页面。

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' },
  ];
}

这是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？谢谢！

编辑

我编辑了app.component.html这样的内容，以了解有关链接“活动”状态的更多信息：

<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。所有其他链接都可以很好地关闭它们的活动状态，并且只有在它们被导航到时才会被激活。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

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 { }

标签： angulartypescriptangular-materialnavigationbar

解决方案

它对你不起作用，因为每个都有相同的 #rla 变量

你可以这样做：

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

<router-outlet></router-outlet>

或使用 {exact:true}

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

<router-outlet></router-outlet>

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