如何在Angular2中设置Bootstrap导航栏"active"class？

Question

如何在 Angular 2 中设置 Bootstrap 导航栏 "active" class？我只找到 Angular 1 way.

当我转到关于页面时，将 class="active" 添加到关于，并删除 class="active" 首页.

<ul class="nav navbar-nav">
    <li class="active"><a [routerLink]="['Home']">Home</a></li>
    <li><a [routerLink]="['About']">About</a></li></li>
</ul>

谢谢

Answer 1

使用 isRouteActive 和 ~~Router~~ class.

中的 generate

根据文档：

generate(linkParams: any[]) : Instruction

Generate an Instruction based on the provided Route Link DSL.

和

isRouteActive(instruction: Instruction) : boolean

Given an instruction, returns true if the instruction is currently active, otherwise false.

<li [class.active]="router.isRouteActive(router.generate(['/Home']))">
   <a [routerLink]="['/Home']">Home</a>
</li>

Answer 2

在 RC2 上对我不起作用。我最终使用了

   <li  (click)="setActive('home')" class="{{getActive('home')}}"> <a [routerLink]="['/FullScreen']">Home</a></li>

并在后面的代码中跟踪了它

    currentChoice: string = "home";

   setActive(choice: string): void{
       this.currentChoice = choice;
   }

   getActive(choice: string) : string{
       if(this.currentChoice == choice)
            return "active";
       else
            return "not";

   }

Answer 3

如果您使用新的 3.0.0.组件路由器 ( https://github.com/angular/vladivostok ) 你可以使用 routerLinkActive 指令。无需进一步 javascript。

<ul class="nav navbar-nav">
  <li [routerLinkActive]="['active']"> <a [routerLink]="['one']">One</a></li>
  <li [routerLinkActive]="['active']"> <a [routerLink]="['second']">Second</a></li>
</ul>

我用了 "@angular/router": "^3.0.0-alpha.7"

Answer 4

对于最新版本的 Angular2 RC4，以下简单代码有效：

      <li [class.active]="router.url==='/about'"><a [routerLink]="['/about']">About</a></li>

使用从“@angular/router”导入{Router}； 并将路由器放入构造函数中。

Answer 5

这样就可以了（使用 RC5）

<li [class.active]="homeLink.classList.contains('active')">
    <a #homeLink routerLink="/home" routerLinkActive="active">Home</a>
</li>

Answer 6

Bert Deterd 的回答是正确的，但还有一点可以补充。

如果一条路由是另一条路由的子串，您会看到类似这样的情况：2 active anchors

您可以添加它以使其仅匹配精确路线：

[routerLinkActiveOptions]="{exact:true}"

完整示例：

<ul class="nav navbar-nav">
  <li [routerLinkActive]="['active']" [routerLinkActiveOptions]="{exact:true}">
    <a [routerLink]="['/']">Home</a>
  </li>
  <li [routerLinkActive]="['active']" [routerLinkActiveOptions]="{exact:true}">
    <a [routerLink]="['/about']">About</a>
  </li>
  <li [routerLinkActive]="['active']" [routerLinkActiveOptions]="{exact:true}">
    <a [routerLink]="['/calendar']">Calendar</a>
  </li>
</ul>

Answer 7

版本"@angular/router": "^3.3.1"

我只是把我在 app.route.ts

中声明的路线名称

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

import { HomeComponent } from './home/home.component';
import { DeclarationsComponent } from './declarations/declarations.component';

const appRoutes: Routes = [
    { path: '', pathMatch: 'full', component: HomeComponent },
    { path: 'declarations', pathMatch: 'full', component: DeclarationsComponent }
];

export const routing: ModuleWithProviders = RouterModule.forRoot(appRoutes);

在视图中，我只写了路线的名称

  <ul class="nav navbar-nav">
     <li routerLinkActive="active"><a routerLink="">Home</a></li>
     <li><a routerLink="declarations">SAV</a></li>
  </ul>

Answer 8

在"@angular/router":"^3.3.1"中，与之前版本的区别在于routerLinkActive

中的括号

[routerLinkActive]="['active']"

在最终版本中，ng2 会报错，所以只需删除括号

routerLinkActive="active"

Answer 9

<a routerLink="/user/bob" routerLinkActive="active-link" [routerLinkActiveOptions]="{exact:
true}">Bob</a>

Answer 10

import { Directive, HostListener, ElementRef, HostBinding, Renderer2 } from '@angular/core';

@Directive({
  selector: '[appNavDropdown]'
})
export class NavDropdownDirective {
  isOpen:boolean =false;
  counter:number = 0;
  constructor(private el: ElementRef, private render: Renderer2) { }

  @HostBinding('class.open') get opened() {
    return this.isOpen;
  }

  @HostListener('click') onmouseClick()
  {
    this.counter++
    console.log();
    if(this.counter % 2 == 1)//odd
    {
      let part = this.render.parentNode(this.el.nativeElement);
      this.render.addClass(part,'open');
      this.isOpen = true;
    }else{
      let part = this.render.parentNode(this.el.nativeElement);
      this.render.removeClass(part,'open');
      this.isOpen = false;
    }
  }
  // @HostListener('mouseleave') onmouseLeave()
  // {
  //   let part = this.render.parentNode(this.el.nativeElement);
  //   this.render.removeClass(part,'open');
  //   this.isOpen = false;
  // }

  toggleClose() {
    // let part = this.render.parentNode(this.el.nativeElement)
    //this.menuclick = false;

  }
  toggle() {
    this.el.nativeElement.classList.toggle('open');
  }
}

/**
* Allows the dropdown to be toggled via click.
*/
@Directive({
  selector: '[appNavDropdownToggle]'
})
export class NavDropdownToggleDirective {
  constructor(private dropdown: NavDropdownDirective) { }

  @HostListener('click', ['$event'])
  toggleOpen($event: any) {
    console.log($event)
    $event.preventDefault();
  //  this.dropdown.toggleClose()
   this.dropdown.toggle();
  }
}

export const NAV_DROPDOWN_DIRECTIVES = [NavDropdownDirective, NavDropdownToggleDirective];

Answer 11

在多个链接的情况下试试这个

<ul class="navbar-nav ml-auto"> 
<li class="nav-item " routerLink="" routerLinkActive="active" [routerLinkActiveOptions]="{exact:true}">
<a class="nav-link" routerLink="">Home </a></li>
<li class="nav-item" [routerLinkActive]="['active']">
<a class="nav-link" routerLink="/aboutus">About</a></li>
<li class="nav-item" [routerLinkActive]="['active']">
<a class="nav-link" routerLink="/gallery">Gallery</a>
 </li>
<li class="nav-item" [routerLinkActive]="['active']">
<a class="nav-link" routerLink="/contactus">Contact Us</a>
</li>
</ul>

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