Angular刷新当前页面的几种方法 |
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默认,当收到导航到当前URL的请求,Angular路由器会忽略。 Heroes重复点击同一链接页面不会刷新。 从Angular 5.1起提供onSameUrlNavigation属性,支持重新加载路由。 @NgModule({ imports: [RouterModule.forRoot(routes, {onSameUrlNavigation: 'reload'})], exports: [RouterModule] })onSameUrlNavigation有两个可选值:'reload'和'ignore',默认为'ignore'。但仅将onSameUrlNavigation改为'reload',只会触发RouterEvent事件,页面是不会重新加载的,还需配合其它方法。在继续之前,我们启用Router Trace,从浏览器控制台查看一下路由事件日志: @NgModule({ imports: [RouterModule.forRoot(routes, {onSameUrlNavigation: 'reload', enableTracing: true})], exports: [RouterModule] })可以看到,未配置onSameUrlNavigation时,再次点击同一链接不会输出日志,配置onSameUrlNavigation为'reload'后,会输出日志,其中包含的事件有:NavigationStart、RoutesRecognized、GuardsCheckStart、GuardsCheckEnd、ActivationEnd、NavigationEnd等。 下面介绍刷新当前页面的几种方法: NavigationEnd 配置onSameUrlNavigation为'reload'监听NavigationEnd事件订阅Router Event,在NavigationEnd中重新加载数据,销毁组件时取消订阅: export class HeroesComponent implements OnDestroy { heroes: Hero[]; navigationSubscription; constructor(private heroService: HeroService, private router: Router) { this.navigationSubscription = this.router.events.subscribe((event: any) => { if (event instanceof NavigationEnd) { this.init(); } }); } init() { this.getHeroes(); } ngOnDestroy() { if (this.navigationSubscription) { this.navigationSubscription.unsubscribe(); } } ... }这种方式可按需配置要刷新的页面,但代码烦琐。 RouteReuseStrategy 配置onSameUrlNavigation为'reload'自定义RouteReuseStrategy,不重用Route有两种实现方式:在代码中更改策略: constructor(private heroService: HeroService, private router: Router) { this.router.routeReuseStrategy.shouldReuseRoute = function () { return false; }; }Angular应用Router为单例对象,因此使用这种方式,在一个组件中更改策略后会影响其他组件,但从浏览器刷新页面后Router会重新初始化,容易造成混乱,不推荐使用。 自定义RouteReuseStrategy: import {ActivatedRouteSnapshot, DetachedRouteHandle, RouteReuseStrategy} from '@angular/router'; export class CustomReuseStrategy implements RouteReuseStrategy { shouldDetach(route: ActivatedRouteSnapshot): boolean { return false; } store(route: ActivatedRouteSnapshot, handle: DetachedRouteHandle | null): void { } shouldAttach(route: ActivatedRouteSnapshot): boolean { return false; } retrieve(route: ActivatedRouteSnapshot): DetachedRouteHandle | null { return null; } shouldReuseRoute(future: ActivatedRouteSnapshot, curr: ActivatedRouteSnapshot): boolean { return false; } }使用自定义RouteReuseStrategy: @NgModule({ imports: [RouterModule.forRoot(routes, {onSameUrlNavigation: 'reload'})], exports: [RouterModule], providers: [ {provide: RouteReuseStrategy, useClass: CustomReuseStrategy} ] })这种方式可以实现较为复杂的Route重用策略。 Resolve使用Resolve可以预先从服务器上获取数据,这样在路由激活前数据已准备好。 实现ResolverService将组件中的初始化代码转移到Resolve中: import {Injectable} from '@angular/core'; import {ActivatedRouteSnapshot, Resolve, RouterStateSnapshot} from '@angular/router'; import {Observable} from 'rxjs'; import {HeroService} from '../hero.service'; import {Hero} from '../hero'; @Injectable({ providedIn: 'root', }) export class HeroesResolverService implements Resolve { constructor(private heroService: HeroService) { } resolve(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable | Observable { return this.heroService.getHeroes(); } }为路由配置resolve: path: 'heroes', component: HeroesComponent, canActivate: [CanActivateAuthGuard], resolve: {heroes: HeroesResolverService} 修改组件代码,改为从resolve中获取数据 constructor(private heroService: HeroService, private route: ActivatedRoute) { } ngOnInit() { this.route.data.subscribe((data: { heroes: Hero[] }) => { this.heroes = data.heroes; }); } 配置onSameUrlNavigation为'reload'配置runGuardsAndResolvers为‘always’runGuardsAndResolvers可选值:'paramsChange' 、'paramsOrQueryParamsChange'、'always' {path: 'heroes', component: HeroesComponent, canActivate: [CanActivateAuthGuard], resolve: {heroes: HeroesResolverService}, runGuardsAndResolvers: 'always'} 时间戳给Router增加时间参数: Heroes constructor(private router: Router) { } gotoHeroes() { this.router.navigate(['/heroes'], { queryParams: {refresh: new Date().getTime()} }); }然后在组件中订阅queryParamMap: constructor(private heroService: HeroService, private route: ActivatedRoute) { this.route.queryParamMap.subscribe(params => { if (params.get('refresh')) { this.init(); } }); }2018广州马拉松 |
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