Angular2將活動類分配給li標籤

Question

我想將活動類分配給angular2中的li標籤，但卡住了。

這是我曾嘗試

<li [class.active]=" _router.isRouteActive(_router.generate(['/dashboard']))" > 

    //the above _router.isRouteActive throws an error 

    <a routerLink="/dashboard"> 
    <i class="icon-display4 position-left"></i> Dashboard</a> 
</li> 

在我的TS文件，我有

export class SecondaryNavComponent implements OnInit { 

    //thinking of using to determine active link 

constructor(public _router:Router) { } //tried also with private 

ngOnInit() { 
} 

}

錯誤讀取

ERROR TypeError: co._router.generate is not a function 

ALse webstorm generates an error that 
unkwon method router is active 

出了什麼問題？

Answer 1

只需使用RouterLinkActive指令此：

https://angular.io/docs/ts/latest/api/router/index/RouterLinkActive-directive.html

這已經是@angular/router包內。