Angular4.x detailed explanation of route redirection steps through route guard

This time I will bring you a detailed explanation of the steps for route redirection through route guards in Angular4.x. What are the precautions for route redirection through route guards in Angular4.x? The following is a practical case. Get up and take a look.

Requirements: I am currently working on an online mall project, and the technology used is Angular4.x. There is a very common requirement: the user reads the

cookie

when clicking the "My" button. If there is data, jump to the personal information page, otherwise jump to registration. Or login page

SolutionThis function is implemented here through Angular's routing guard.

1. Configure routing information

const routes = [
 { path: 'home', component: HomeComponent },
 { path: 'product', component: ProductComponent },
 { path: 'register', component: RegisterComponent },
 { path: 'my', component: MyComponent },
 { path: 'login', component: LoginComponent, canActivate: [RouteguardService] },//canActivate就是路由守卫
 { path: '', redirectTo: '/home', pathMatch: 'full' }
]

2. Route guard conditions (RouteguardService.ts)

import { Injectable, Inject } from "@angular/core";
import { DOCUMENT } from "@angular/common";
import { CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot, Router, NavigationStart } from "@angular/router";
import userModel from "./user.model";
@Injectable()
export class RouteguardService implements CanActivate {
  constructor(private router: Router, @Inject(DOCUMENT) private document: any) {
  }
  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    // this.setCookie("userId", "18734132326", 10);
    //读取cookie
    var cookies = this.document.cookie.split(";");
    var userInfo = { userId: "", pw: "" };
    if (cookies.length > 0) {
      for (var cookie of cookies) {
        if (cookie.indexOf("userId=") > -1) {
          userModel.accout = cookie.split("=")[0];
          userModel.password = cookie.split("=")[1];
          userModel.isLogin = false;
        }
      }
    }
    //获取当前路由配置信息
    var path = route.routeConfig.path;
    if (path == "login") {
      if (!userModel.isLogin) {
        //读取cookie如果没有用户信息，则跳转到当前登录页
        return true;
      } else {
        //如果已经登录了则跳转到个人信息页面，下面语句是通过ts进行路由导航的
        this.router.navigate(['product'])
      }
    }
  }
  setCookie(cname, cvalue, exdays) {
    var d = new Date();
    d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
    var expires = "expires=" + d.toUTCString();
    document.cookie = cname + "=" + cvalue + "; " + expires;
  }
}

I believe I have read it You have mastered the method in the case of this article. For more exciting information, please pay attention to other related articles on the php Chinese website!

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