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    angular学习之路由模块浅析

    青灯夜游青灯夜游2022-05-23 11:07:10转载112
    本篇文章带大家了解一下angular中的路由模块，介绍一下匹配规则、路由传参、路由嵌套、命名插座、导航路由、路由懒加载等相关知识，希望对大家有所帮助！

    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。【相关教程推荐：《angular教程》】

    快速上手

    1、创建页面组件、Layout 组件以及 Navigation 组件，供路由使用

    2、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
  }
]

    3、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 {}

    4、添加路由插座

    <!-- 路由插座即占位组件 匹配到的路由组件将会显示在这个地方 -->
<router-outlet></router-outlet>

    5、在导航组件中定义链接

    <a routerLink="/home">首页</a>
<a routerLink="/about">关于我们</a>

    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: "about",
    component: AboutComponent
  },
  {
    path: "**",
    component: NotFoundComponent
  }
]

    路由传参

    1、查询参数

    <a routerLink="/about" [queryParams]="{ name: 'kitty' }">关于我们</a>
    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
  }
]
    <a [routerLink]="['/about', 'zhangsan']">关于我们</a>
    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.component.html -->
<app-layout>
  <p>about works!</p>
  <a routerLink="/about/introduce">公司简介</a>
  <a routerLink="/about/history">发展历史</a>
  <div>
    <router-outlet></router-outlet>
  </div>
</app-layout>

    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.component.html -->
<app-layout>
  <p>about works!</p>
  <router-outlet name="left"></router-outlet>
  <router-outlet name="right"></router-outlet>
</app-layout>
    <a
    [routerLink]="[
      '/about',
      {
        outlets: {
          left: ['introduce'],
          right: ['history']
        }
      }
    ]"
    >关于我们
</a>

    导航路由

    <!-- app.component.html -->
 <button (click)="jump()">跳转到发展历史</button>
    // 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"
import { HomeComponent } from "./pages/home/home.component"
import { NotFoundComponent } from "./pages/not-found/not-found.component"

@NgModule({
  declarations: [AppComponent，HomeComponent, NotFoundComponent],
  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。

    1、创建用户模块 ng g m user --routing=true 一并创建该模块的路由模块

    2、创建登录页面组件 ng g c user/pages/login

    3、创建注册页面组件 ng g c user/pages/register

    4、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 {}

    5、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)
  }
]

    6、在导航组件中添加访问链接

    <a routerLink="/user/login">登录</a>
<a routerLink="/user/register">注册</a>

    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 <boolean> 或 Promise <boolean>，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<CanComponentLeave> {
  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 <name>

    import { Injectable } from "@angular/core"
import { Resolve } from "@angular/router"

type returnType = Promise<{ name: string }>

@Injectable({
  providedIn: "root"
})
export class ResolveGuard implements Resolve<returnType> {
  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)
  }
}

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