Angular 嵌套组件路由

Question

我有一个导航栏组件，它有一个 routerLink

 <p>
  <a routerLink="/user">User</a>
</p>

以及我正在向其传递值的 UserComponent 下的嵌套组件

@Component({
  selector: 'app-user',
  template: `
    <input #box (keyup.enter)="onEnter(box.value)">
    <div *ngIf="box.size > 0">
      <app-order [value]="value"></app-order>
    </div>`

})
export class UserComponent implements OnInit {

  value = '';

  onEnter(value: string) {
    this.value = value;
  }

  constructor() {
  }

  ngOnInit() {
  }

}

订单组件

@Component({
  selector: 'app-order',
  template:`{{id}}`
})
export class OrderComponent implements OnInit {

  @Input() id:String;

  constructor() { }

  ngOnInit() {
  }

}

现在，当我输入用户 link 时，我会看到 link 和传递的值。当我再次单击 link 时，我得到了具有相同值的页面。我怎样才能改变这种行为，以便当我再次点击路由按钮时，我得到没有传递值的输入？

Answer 1

我在点击导航栏上的相关按钮尝试刷新页面时遇到了同样的问题。

Angular 声明在同一个 URL 上的导航无效，因为应用程序的状态由其当前 URL.

表示

有一个解决方法：onSameUrlNavigation

不幸的是，这个选项只允许守卫和解析器在导航到同一个 URL 时再次运行，所以如果你激活它，你会注意到......什么都没有！

所以我用这个class创建了自己的解决方法：

/**
 * Abstract class that allows derived components to get refreshed automatically on route change.
 * The actual use case is : a page gets refreshed by navigating on the same URL and we want the rendered components to refresh
 */
export abstract class AutoRefreshingComponent implements OnInit, OnDestroy {
  public routerEventsSubscription: Subscription;
  protected router: Router;

  constructor() { 
    this.router = AppInjector.get(Router);
  }

  /**
   * Initialization behavior. Note that derived classes must not implement OnInit.
   * Use initialize() on derived classes instead.
   */
  ngOnInit() {
    this.initialize();
    this.routerEventsSubscription = this.router.events.filter(x => x instanceof NavigationEnd).subscribe(res => {
      this.initialize();
    });
  }

  /**
   * Destruction behavior. Note that derived classes must not implement OnDestroy.
   * Use destroy() on derived classes instead.
   */
  ngOnDestroy(): void {
    this.routerEventsSubscription.unsubscribe();
    this.destroy();
  }

  /**
   * Function that allows derived components to define an initialization behavior
   */
  abstract initialize(): void;

  /**
   * Function that allows derived components to define a destruction behavior
   */
  abstract destroy(): void;

}

AppInjector 指的是这个：

import {Injector} from '@angular/core';

/**
 * Allows for retrieving singletons using `AppInjector.get(MyService)` (whereas
 * `ReflectiveInjector.resolveAndCreate(MyService)` would create a new instance
 * of the service).
 */
export let AppInjector: Injector;

/**
 * Helper to access the exported {@link AppInjector}, needed as ES6 modules export
 * immutable bindings; see http://2ality.com/2015/07/es6-module-exports.html
 */
export function setAppInjector(injector: Injector) {
    if (AppInjector) {
        // Should not happen
        console.error('Programming error: AppInjector was already set');
    }
    else {
        AppInjector = injector;
    }
}

并且在您的 AppModule 中：

import { setAppInjector } from './app.injector';

// ...

export class AppModule {
  constructor(private injector: Injector) {
    setAppInjector(injector);
  }
}

然后使所有需要的组件扩展 AutoRefreshingComponent。

你的情况：

@Component({
  selector: 'app-user',
  template: `
    <input #box (keyup.enter)="onEnter(box.value)">
    <div *ngIf="box.size > 0">
      <app-order [value]="value"></app-order>
    </div>`

})
export class UserComponent extends AutoRefreshingComponent {

  value = '';

  onEnter(value: string) {
    this.value = value;
  }

  constructor() {
  }

  initialize() {
     // Reset your box value
  }

  destroy() {
  }

}

这对于您想要实现的目标来说可能有点矫枉过正，但是每次您想要在同一 URL 导航上刷新组件时它都会很有用。

如果有帮助请告诉我。

Angular 嵌套组件路由

Angular nested component routing

typescript

angular

angular-router