angular 9 candeactivate 不工作虽然代码似乎没问题而且没有抛出任何错误

Question

大家好，我是 Angular 的新手，正在使用以下教程学习内容 link。由于某种原因， canDeactivate 路由守卫似乎不起作用。任何帮助将不胜感激，因为我尝试检查很多东西但 none 有效。我有最新的 angular CLI，我的代码中没有错误，并且出于某种原因，在路由更改期间根本没有调用 canDeactivate 函数。

我正在 CreateEmployee 路线上应用该功能，因此当我填写 createEmployee 的表格并尝试导航到不同的路线时，它应该会启动。

create-employee-component.html: 在这里，我有几个表单元素

<form #employeeForm = "ngForm" (ngSubmit)="saveEmployee()" [ngClass]="{'was-validated': employeeForm.submitted}" novalidate>

创建员工-component.ts

import { Component, OnInit, ViewChild } from '@angular/core';
import { NgForm } from '@angular/forms';
import { Department } from '../models/department.model';
import { BsDatepickerConfig } from 'ngx-bootstrap/datepicker';
import { Employee } from '../models/employee.model';
import { EmployeeService } from './employee.service';
import { Router } from '@angular/router';

@Component({
  selector: 'app-create-employee',
  templateUrl: './create-employee.component.html',
  styleUrls: ['./create-employee.component.css']
})
export class CreateEmployeeComponent implements OnInit {
    @ViewChild('employeeForm') public createEmployeeForm: NgForm;
    datePickerConfig: Partial<BsDatepickerConfig>;
    previewPhoto = false;

创建员工可以停用-guard.service.ts

import { Injectable } from '@angular/core';
import { CanDeactivate } from '@angular/router';
import { CreateEmployeeComponent  } from './create-employee.component';

@Injectable()
export class CreateEmployeeCanDeactivateGuardService implements CanDeactivate<CreateEmployeeComponent>{
    canDeactivate(component: CreateEmployeeComponent): boolean{
        alert("HJEJJEJEJ");
        if(component.createEmployeeForm.dirty)
        {
            return confirm('Are you sure you want to discard your changes?');
        }
        return true;
    }
}

app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { ListEmployeesComponent } from './employees/list-employees.component';
import { CreateEmployeeComponent } from './employees/create-employee.component';
import { CreateEmployeeCanDeactivateGuardService } from './employees/create-employee-can-deactivate-guard.service';


const routes: Routes = [
    {path: 'list', component: ListEmployeesComponent},
    {
        path:'create', 
        component: CreateEmployeeComponent,
        canDeactivate: [CreateEmployeeCanDeactivateGuardService]
    },
    {path: '', redirectTo:'/list', pathMatch:'full'}
];

@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule],
  providers: [CreateEmployeeCanDeactivateGuardService]
})
export class AppRoutingModule { }

根据我在 Whosebug 上找到的其他一些答案，我觉得一切都是正确的。请让我知道我在这里做错了什么。我也发布了我的代码 here.

Answer 1

我终于找到问题所在了。经过一段时间的研究后，我发现之前在导航栏中我使用的是带有锚标记的 href 元素，因此 canDeactivate 守卫没有启动。现在我将其更改为 [routerLink]="['/list']" 并且canDeactivate 开始正常工作。

发布答案，因为它可能对正在寻找解决方案的人有用：

带有锚标记和 href 元素的上一个导航栏：

<a class="nav-link" href="list">List <span class="sr-only">(current)</span></a>

使用锚标记和 routerLink 更改了导航栏，它与 canDeactivate:

一起工作正常

<a class="nav-link" [routerLink]="['/list']">List <span class="sr-only">(current)</span></a>

如果您正在寻找整个代码，请查看我提到的与 canDeactivate 守卫相关的所有代码块的问题。

angular 9 candeactivate 不工作虽然代码似乎没问题而且没有抛出任何错误

angular 9 candeactivate not working although code seems to be fine and not throwing any error

angular-ui-router

angular-cli

angular-router-guards

candeactivate