Question

您好，我是Angular的新手，可以使用以下教程link学习这些内容。由于某种原因，canDeactivate路由防护似乎无法正常工作。当我尝试检查很多东西但没有任何效果时，任何帮助将不胜感激。我拥有最新的角度CLI，我的代码中没有错误，由于某种原因，在更改路线时根本不会调用canDeactivate函数。

我在CreateEmployee路由上应用了该函数，因此当我填写createEmployee表单并尝试导航到其他路由时，它将启动。

create-employee-component.html ：在此，我的表单元素很少

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

create-employee-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;

create-employee-can-deactivate-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StackOverflow上找到的其他一些答案，我认为一切正确。请让我知道我在做什么错。我还发布了我的代码here。

Answer 1

我终于发现了问题所在。经过一段时间的研究，我发现之前在导航栏中我使用的是带有定位标记的href元素，因此canDeactivate卫队没有加入。现在我将其更改为[routerLink]="['/list']"， canDeactivate开始正常工作。

发布答案，因为它可能对寻求解决方案的人有用：

上一个带有锚标签和href元素的导航栏：

<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，该导航栏与canDeactivate一起正常工作：

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

如果您要查找整个代码，请检查我提到与canDeactivate保护有关的所有代码块的问题。

angular 9 candeactivate无法正常工作，尽管代码似乎还不错并且没有引发任何错误

1 个答案: