如何理解Angular中的路由
这篇文章将为大家详细讲解有关如何理解Angular中的路由,文章内容质量较高,因此小编分享给大家做个参考,希望大家阅读完这篇文章后对相关知识有一定的了解。
成都创新互联服务项目包括常熟网站建设、常熟网站制作、常熟网页制作以及常熟网络营销策划等。多年来,我们专注于互联网行业,利用自身积累的技术优势、行业经验、深度合作伙伴关系等,向广大中小型企业、政府机构等提供互联网行业的解决方案,常熟网站推广取得了明显的社会效益与经济效益。目前,我们服务的客户以成都为中心已经辐射到常熟省份的部分城市,未来相信会继续扩大服务区域并继续获得客户的支持与信任!
!在 Angular
中,路由是以模块为单位的,每个模块都可以有自己的路由。
快速上手
创建页面组件、Layout
组件以及 Navigation
组件,供路由使用
创建首页页面组件
ng g c pages/home
创建关于我们页面组件
ng g c pages/about
创建布局组件
ng g c pages/layout
创建导航组件
ng g c pages/navigation
创建路由规则
// app.module.ts import { Routes } from "@angular/router" const routes: Routes = [ { path: "home", component: HomeComponent }, { path: "about", component: AboutComponent } ]
引入路由模块并启动
// app.module.ts import { RouterModule, Routes } from "@angular/router" @NgModule({ imports: [RouterModule.forRoot(routes, { useHash: true })], }) export class AppModule {}
添加路由插座
在导航组件中定义链接
首页 关于我们
匹配规则
1、重定向
const routes: Routes = [ { path: "home", component: HomeComponent }, { path: "about", component: AboutComponent }, { path: "", // 重定向 redirectTo: "home", // 完全匹配 pathMatch: "full" } ]
2、404
页面
const routes: Routes = [ { path: "home", component: HomeComponent }, { path: "**", component: NotFoundComponent } ]
路由传参
1、查询参数
关于我们
import { ActivatedRoute } from "@angular/router" export class AboutComponent implements OnInit { constructor(private route: ActivatedRoute) {} ngOnInit(): void { this.route.queryParamMap.subscribe(query => { query.get("name") }) } }
2、动态参数
const routes: Routes = [ { path: "home", component: HomeComponent }, { path: "about/:name", component: AboutComponent } ]
关于我们
import { ActivatedRoute } from "@angular/router" export class AboutComponent implements OnInit { constructor(private route: ActivatedRoute) {} ngOnInit(): void { this.route.paramMap.subscribe(params => { params.get("name") }) } }
路由嵌套
路由嵌套指的是如何定义子级路由
const routes: Routes = [ { path: "about", component: AboutComponent, children: [ { path: "introduce", component: IntroduceComponent }, { path: "history", component: HistoryComponent } ] } ]
about works!
公司简介 发展历史
命名插座
将子级路由组件显示到不同的路由插座中
{ path: "about", component: AboutComponent, children: [ { path: "introduce", component: IntroduceComponent, outlet: "left" }, { path: "history", component: HistoryComponent, outlet: "right" } ] }
about works!
关于我们
导航路由
// app.component.ts import { Router } from "@angular/router" export class HomeComponent { constructor(private router: Router) {} jump() { this.router.navigate(["/about/history"], { queryParams: { name: "Kitty" } }) } }
路由模块
将根模块中的路由配置抽象成一个单独的路由模块,称之为根路由模块,然后在根模块中引入根路由模块
import { NgModule } from "@angular/core" import { HomeComponent } from "./pages/home/home.component" import { NotFoundComponent } from "./pages/not-found/not-found.component" const routes: Routes = [ { path: "", component: HomeComponent }, { path: "**", component: NotFoundComponent } ] @NgModule({ declarations: [], imports: [RouterModule.forRoot(routes, { useHash: true })], // 导出 Angular 路由功能模块,因为在根模块的根组件中使用了 RouterModule 模块中提供的路由插座组件 exports: [RouterModule] }) export class AppRoutingModule {}
import { BrowserModule } from "@angular/platform-browser" import { NgModule } from "@angular/core" import { AppComponent } from "./app.component" import { AppRoutingModule } from "./app-routing.module" @NgModule({ declarations: [AppComponent], imports: [BrowserModule, AppRoutingModule], providers: [], bootstrap: [AppComponent] }) export class AppModule {}
路由懒加载
路由懒加载是以模块为单位的。
创建用户模块
ng g m user --routing=true
并创建该模块的路由模块创建登录页面组件
ng g c user/pages/login
创建注册页面组件
ng g c user/pages/register
配置用户模块的路由规则
import { NgModule } from "@angular/core" import { Routes, RouterModule } from "@angular/router" import { LoginComponent } from "./pages/login/login.component" import { RegisterComponent } from "./pages/register/register.component" const routes: Routes = [ { path: "login", component: LoginComponent }, { path: "register", component: RegisterComponent } ] @NgModule({ imports: [RouterModule.forChild(routes)], exports: [RouterModule] }) export class UserRoutingModule {}
将用户路由模块关联到主路由模块
// app-routing.module.ts const routes: Routes = [ { path: "user", loadChildren: () => import("./user/user.module").then(m => m.UserModule) } ]
在导航组件中添加访问链接
登录 注册
路由守卫
路由守卫会告诉路由是否允许导航到请求的路由。
路由守方法可以返回 boolean
或 Observable \
或 Promise \
,它们在将来的某个时间点解析为布尔值
1、CanActivate
检查用户是否可以访问某一个路由。
CanActivate
为接口,路由守卫类要实现该接口,该接口规定类中需要有 canActivate
方法,方法决定是否允许访问目标路由。
路由可以应用多个守卫,所有守卫方法都允许,路由才被允许访问,有一个守卫方法不允许,则路由不允许被访问。
创建路由守卫:ng g guard guards/auth
import { Injectable } from "@angular/core" import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree, Router } from "@angular/router" import { Observable } from "rxjs" @Injectable({ providedIn: "root" }) export class AuthGuard implements CanActivate { constructor(private router: Router) {} canActivate(): boolean | UrlTree { // 用于实现跳转 return this.router.createUrlTree(["/user/login"]) // 禁止访问目标路由 return false // 允许访问目标路由 return true } }
{ path: "about", component: AboutComponent, canActivate: [AuthGuard] }
2、CanActivateChild
检查用户是否方可访问某个子路由。
创建路由守卫:ng g guard guards/admin
注意:选择
CanActivateChild
,需要将箭头移动到这个选项并且敲击空格确认选择
import { Injectable } from "@angular/core" import { CanActivateChild, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from "@angular/router" import { Observable } from "rxjs" @Injectable({ providedIn: "root" }) export class AdminGuard implements CanActivateChild { canActivateChild(): boolean | UrlTree { return true } }
{ path: "about", component: AboutComponent, canActivateChild: [AdminGuard], children: [ { path: "introduce", component: IntroduceComponent } ] }
3、CanDeactivate
检查用户是否可以退出路由。比如用户在表单中输入的内容没有保存,用户又要离开路由,此时可以调用该守卫提示用户
import { Injectable } from "@angular/core" import { CanDeactivate, ActivatedRouteSnapshot, RouterStateSnapshot, UrlTree } from "@angular/router" import { Observable } from "rxjs" export interface CanComponentLeave { canLeave: () => boolean } @Injectable({ providedIn: "root" }) export class UnsaveGuard implements CanDeactivate{ canDeactivate(component: CanComponentLeave): boolean { if (component.canLeave()) { return true } return false } }
{ path: "", component: HomeComponent, canDeactivate: [UnsaveGuard] }
import { CanComponentLeave } from "src/app/guards/unsave.guard" export class HomeComponent implements CanComponentLeave { myForm: FormGroup = new FormGroup({ username: new FormControl() }) canLeave(): boolean { if (this.myForm.dirty) { if (window.confirm("有数据未保存, 确定要离开吗")) { return true } else { return false } } return true }
4、Resolve
允许在进入路由之前先获取数据,待数据获取完成之后再进入路由
$ ng g resolver
import { Injectable } from "@angular/core" import { Resolve } from "@angular/router" type returnType = Promise<{ name: string }> @Injectable({ providedIn: "root" }) export class ResolveGuard implements Resolve{ resolve(): returnType { return new Promise(function (resolve) { setTimeout(() => { resolve({ name: "张三" }) }, 2000) }) } }
{ path: "", component: HomeComponent, resolve: { user: ResolveGuard } }
export class HomeComponent { constructor(private route: ActivatedRoute) {} ngOnInit(): void { console.log(this.route.snapshot.data.user) } }
关于如何理解Angular中的路由就分享到这里了,希望以上内容可以对大家有一定的帮助,可以学到更多知识。如果觉得文章不错,可以把它分享出去让更多的人看到。
网站标题:如何理解Angular中的路由
新闻来源:http://myzitong.com/article/igsidj.html