角2：类型错误：无法读取的未定义的属性'isRouteActive“在 [英] Angular 2: TypeError: Cannot read property 'isRouteActive' of undefined in

问题描述

我想使用 isRouteActive 功能切换有效类的<​​code>李在单击其中包含的链接元素，但它一直给我像错误类型错误：在[isRouteActive（[无法读取的未定义的属性'isRouteActive'./家 ]）在AppComponent @ 6：16] 。该文件看起来像下面这样：

I am trying to use isRouteActive function to switch the active class of the li elements upon clicking the links contained within them, but it keeps giving me the errors like TypeError: Cannot read property 'isRouteActive' of undefined in [isRouteActive(['./Home']) in AppComponent@6:16]. The file looks like the following:

import {Component} from 'angular2/core';
import {ROUTER_DIRECTIVES, RouteConfig, Router } from 'angular2/router';
import {FORM_PROVIDERS, FORM_DIRECTIVES, Control} from 'angular2/common';
import {LoginComponent} from './login.component.js';
import {HomeComponent} from './home.component.js';

@Component({
selector: 'front-page-app',
providers: [ FORM_PROVIDERS ],
directives: [ ROUTER_DIRECTIVES, FORM_DIRECTIVES ],
template: `
<div class="container">
  <div class="header clearfix">
    <nav>
      <ul class="nav nav-pills pull-right">
        <li #homeLink role="presentation" 
            [class.active]="isRouteActive(['./Home'])">
        <a [routerLink]="['./Home']">Home</a>
        </li>
        <li #loginLink role="presentation" 
            [class.active]="isRouteActive(['./Login'])">
        <a [routerLink]="['./Login']">Login</a>
        </li>
      </ul>
    </nav>
    <h3 class="text-muted">Fomoapp</h3>
  </div>
</div> <!-- /container -->
<router-outlet></router-outlet>
`
})

@RouteConfig([
{ path: '/login', component: LoginComponent, name: 'Login' },
{ path: '/home', component: HomeComponent, name: 'Home' },
{ path: '/', redirectTo: ['Home'] }
])
export class AppComponent { 
public isRouteActive(route) {
    return this.router.isRouteActive(this.router.generate(route))
}
}

我尝试了各种路径，如/家'，'＃/家'，'/家庭'，'./Home'，'家'，但他们没有工作。什么错误可能与？而如何真正调试这种情况？

I tried a variety of paths, like '/home', '#/home', '/Home', './Home', 'Home' but none of them work. What the error could be related to? And how to actually debug such situations?

推荐答案

刚刚发布的问题，终于找到了答案：忘了构造和供应路由器在里面。因此，工作版本修改出口类Appcomponent 部分，看起来下列方式：

Just posted the question and finally found the answer: forgot to put constructor and supply Router in it. So, working version changes export class Appcomponent part and looks the following way:

export class AppComponent { 
constructor(private router: Router){
}
public isRouteActive(route) {
    return this.router.isRouteActive(this.router.generate(route))
}
}

另见链接：<一个href=\"http://ux.$c$cover.org/questions/34925782/angular2-routing-persisting-route-tabs-and-child-routes\" rel=\"nofollow\">http://ux.$c$cover.org/questions/34925782/angular2-routing-persisting-route-tabs-and-child-routes

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