Angular 2路由器事件监听器 [英] Angular 2 router event listener

问题描述

如何在Angular 2路由器中监听状态更改？

How to listen state change in Angular 2 router?

在Angular 1.x中我使用了此事件：

In Angular 1.x I used this event:

$rootScope.$on('$stateChangeStart',
    function(event,toState,toParams,fromState,fromParams, options){ ... })

所以，如果我在Angular 2中使用这个eventlistener：

So, if I use this eventlistener in Angular 2:

window.addEventListener("hashchange", () => {return console.log('ok')}, false);

它不会返回'ok'，然后从JS更改状态，只有浏览器history.back （）函数运行。

it isn't return 'ok', then change state from JS, only then browser history.back() function run.

使用router.subscribe（）函数作为服务：

Use router.subscribe() function as the service:

import {Injectable} from 'angular2/core';
import {Router} from 'angular2/router';

@Injectable()
export class SubscribeService {
    constructor (private _router: Router) {
        this._router.subscribe(val => {
            console.info(val, '<-- subscribe func');
        })
    }
}

在路由中初始化的组件中注入服务：

Inject service in component which init in routing:

import {Component} from 'angular2/core';
import {Router} from 'angular2/router';

@Component({
    selector: 'main',
    templateUrl: '../templates/main.html',
    providers: [SubscribeService]
})
export class MainComponent {
    constructor (private subscribeService: SubscribeService) {}
}

我将此服务注入其他组件，例如本例中。然后我改变状态，console.info（）服务不工作。

I inject this service in other components such as in this example. Then I change state, console.info() in service not working.

我做错了什么？

推荐答案

新路由器

constructor(router:Router) {
  router.events.subscribe(event:Event => {
    if(event instanceof NavigationStart) {
    }
    // NavigationEnd
    // NavigationCancel
    // NavigationError
    // RoutesRecognized
  });
}

旧

注入路由器并订阅路由更改事件

Inject the Router and subscribe to route change events

import {Router} from 'angular2/router';

class MyComponent {
  constructor(router:Router) {
    router.subscribe(...)
  }
}

注意

对于新路由器，不要忘记从路由器模块导入 NavigationStart

For the new router, don't forget to import NavigationStart from router module

import { Router, NavigationStart } from '@angular/router';

因为如果你不导入它 instanceof 将无效并且错误 NavigationStart未定义将上升。

because if you don't import it instanceof will not work and an error NavigationStart is not defined will rise.

参见

• https://angular.io/docs/ts/latest/api/router/index/Router-class.html


• 如何检测Angular 2中的路线变化？

• https://angular.io/docs/ts/latest/api/router/index/Router-class.html
• How to detect a route change in Angular 2?

这篇关于Angular 2路由器事件监听器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！