在Angular2路线导航上显示加载微调器
我从@borislemke看到了()及其答案 实际上,在Angular2演示应用程序上进行了尝试,但在导航到另一条路线时,它并没有改变Loader Div的背景颜色 我的AppComponent如下所示在Angular2路线导航上显示加载微调器,angular,angular2-routing,Angular,Angular2 Routing,我从@borislemke看到了()及其答案 实际上,在Angular2演示应用程序上进行了尝试,但在导航到另一条路线时,它并没有改变Loader Div的背景颜色 我的AppComponent如下所示 import { Component, OnInit } from '@angular/core'; import { Router, ROUTER_DIRECTIVES, NavigationStart, NavigationEnd, NavigationError, Nav
import { Component, OnInit } from '@angular/core';
import { Router, ROUTER_DIRECTIVES, NavigationStart, NavigationEnd, NavigationError, NavigationCancel } from '@angular/router';
import {NgClass} from '@angular/common';
import { DialogService } from './dialog.service';
import { HeroService } from './heroes/hero.service';
@Component({
selector: 'my-app',
template: `
<h1 class="title">Component Router</h1>
<div>Is Navigating --> {{isLoading}}</div>
<div [ngClass]="{afterLoad: !isLoading, loading: isLoading }" > Loader Spinner Container </div>
<nav>
<a routerLink="/crisis-center" routerLinkActive="active"
routerLinkActiveOptions="{ exact: true }">Crisis Center</a>
<a routerLink="/heroes" routerLinkActive="active">Heroes</a>
<a routerLink="/crisis-center/admin" routerLinkActive="active">Crisis Admin</a>
<a routerLink="/login" routerLinkActive="active">Login</a>
</nav>
<router-outlet></router-outlet>
`,
styles:[`
.loading{
background-color:red
}
.afterLoad{
background-color:yellow
}
`],
providers: [
HeroService,
DialogService
],
directives: [ROUTER_DIRECTIVES, NgClass]
})
export class AppComponent implements OnInit {
isLoading: boolean = false;
constructor(private _router:Router) {}
ngOnInit() {
// TODO: assign proper type to event
this._router.events.subscribe((event: any): void => {
this.navigationInterceptor(event);
});
}
navigationInterceptor(event): void {
if (event instanceof NavigationStart) {
this.isLoading = true;
}
if (event instanceof NavigationEnd) {
this.isLoading = false;
}
if (event instanceof NavigationCancel) {
this.isLoading = false;
}
if (event instanceof NavigationError) {
this.isLoading = false;
}
}
}
从'@angular/core'导入{Component,OnInit};
从'@angular/Router'导入{Router,Router_指令,NavigationStart,NavigationEnd,NavigationError,NavigationCancel};
从'@angular/common'导入{NgClass};
从“./dialog.service”导入{DialogService};
从“./heros/hero.service”导入{HeroService};
@组成部分({
选择器:“我的应用程序”,
模板:`
组件路由器
正在导航-->{{isLoading}
装载机旋转容器
用于现场测试
有人能帮我找出失败的可能原因吗
谢谢。您的应用程序太快,无法获取导航更改:)
我添加了一个setTimeout来模拟慢速连接,如下所示:
if (event instanceof NavigationEnd) {
// this.isLoading = false;
setTimeout(() => this.isLoading = false, 1000);
}
尝试上述代码,您可以看到背景颜色的变化