Angular 7 : 注入的服务未定义

Question

我试图在 LoginService 中注入 AccountService 但它不会，accountService 未定义但另一方面 authServiceProvider 已定义。

相反，它完美地注入了 footerComponent。

那么为什么 AccountService 被完美地注入到 FooterComponent 中，却在 LoginService 中出现错误。

我不知道问题出在哪里。

import { Injectable } from '@angular/core';
import { AccountService } from 'app/core/auth/account.service';
import { AuthServerProvider } from 'app/core/auth/auth-jwt.service';
@Injectable({ providedIn: 'root' })
export class LoginService {
    constructor(public accountService: AccountService, private authServerProvider: AuthServerProvider) {
        console.log(this.accountService); //  is undefined 
        console.log(this.authServerProvider); // is defined
}

这是 AuthentificationService

@Injectable({ providedIn: 'root' })
export class AuthServerProvider {
    constructor(private http: HttpClient, private $localStorage: LocalStorageService, private $sessionStorage: SessionStorageService) {}

这是账户服务

@Injectable({ providedIn: 'root' })
export class AccountService {
    private userIdentity: any;
    private authenticated = false;
    private authenticationState = new Subject<any>();
    constructor(private languageService: JhiLanguageService, private sessionStorage: SessionStorageService, private http: HttpClient) {}

我尝试在其他组件中使用 AccountService，它完美地注入了

import { Component } from '@angular/core';
import { AccountService } from 'app/core';
@Component({
    selector: 'jhi-footer',
    templateUrl: './footer.component.html',
    styleUrls: ['./footer.component.scss']
})
export class FooterComponent {

    constructor( private accountService: AccountService) {
        console.log(this.accountService); // It is defined

    }
}

这是app.module.ts

import './vendor.ts';
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HTTP_INTERCEPTORS } from '@angular/common/http';
import { NgbDatepickerConfig } from '@ng-bootstrap/ng-bootstrap';
import { Ng2Webstorage } from 'ngx-webstorage';
import { NgJhipsterModule } from 'ng-jhipster';
import { AuthInterceptor } from './blocks/interceptor/auth.interceptor';
import { AuthExpiredInterceptor } from './blocks/interceptor/auth-expired.interceptor';
import { ErrorHandlerInterceptor } from './blocks/interceptor/errorhandler.interceptor';
import { NotificationInterceptor } from './blocks/interceptor/notification.interceptor';
import { SharedModule } from 'app/shared';
import { CoreModule } from 'app/core';
import { AppRoutingModule } from './app-routing.module';
import { HomeModule } from './home/home.module';
import { AccountModule } from './account/account.module';
import { EntityModule } from './entities/entity.module';
import * as moment from 'moment';
// jhipster-needle-angular-add-module-import JHipster will add new module here
import { JhiMainComponent, NavbarComponent, FooterComponent, PageRibbonComponent, ActiveMenuDirective, ErrorComponent } from './layouts';
@NgModule({
    imports: [
        BrowserModule,
        Ng2Webstorage.forRoot({ prefix: 'jhi', separator: '-' }),
        NgJhipsterModule.forRoot({
            // set below to true to make alerts look like toast
            alertAsToast: false,
            alertTimeout: 5000,
            i18nEnabled: true,
            defaultI18nLang: 'en'
        }),
        SharedModule.forRoot(),
        CoreModule,
        HomeModule,
        AccountModule,
        // jhipster-needle-angular-add-module JHipster will add new module here
        EntityModule,
        AppRoutingModule
    ],
    declarations: [JhiMainComponent, NavbarComponent, ErrorComponent, PageRibbonComponent, ActiveMenuDirective, FooterComponent],
    providers: [
        {
            provide: HTTP_INTERCEPTORS,
            useClass: AuthInterceptor,
            multi: true
        },
        {
            provide: HTTP_INTERCEPTORS,
            useClass: AuthExpiredInterceptor,
            multi: true
        },
        {
            provide: HTTP_INTERCEPTORS,
            useClass: ErrorHandlerInterceptor,
            multi: true
        },
        {
            provide: HTTP_INTERCEPTORS,
            useClass: NotificationInterceptor,
            multi: true
        }
    ],
    bootstrap: [JhiMainComponent]
})
export class AppModule {
    constructor(private dpConfig: NgbDatepickerConfig) {
        this.dpConfig.minDate = { year: moment().year() - 100, month: 1, day: 1 };
    }
}

这是 core.module .

import { NgModule, LOCALE_ID } from '@angular/core';
import { DatePipe, registerLocaleData } from '@angular/common';
import { HttpClientModule } from '@angular/common/http';
import { Title } from '@angular/platform-browser';
import locale from '@angular/common/locales/en';
@NgModule({
    imports: [HttpClientModule],
    exports: [],
    declarations: [],
    providers: [
        Title,
        {
            provide: LOCALE_ID,
            useValue: 'en'
        },
        DatePipe
    ]
})
export class CoreModule {
    constructor() {
        registerLocaleData(locale);
    }
}

在此先感谢您的帮助。

Answer 1

You should always provide your service in the root injector unless there is a case where you want the service to be available only if the consumer imports a particular @NgModule.

尝试在 core.module

中添加您要在 providers : [ ] 中注入的服务

import { NgModule, LOCALE_ID } from '@angular/core';
import { DatePipe, registerLocaleData } from '@angular/common';
import { HttpClientModule } from '@angular/common/http';
import { Title } from '@angular/platform-browser';
import locale from '@angular/common/locales/en';
@NgModule({
    imports: [HttpClientModule],
    exports: [],
    declarations: [],
    providers: [
        AccountService,
        Title,
        {
            provide: LOCALE_ID,
            useValue: 'en'
        },
        DatePipe
    ]
})
export class CoreModule {
    constructor() {
        registerLocaleData(locale);
    }
}

并在您的 AccountService 中将 @Injectable({ providedIn: 'root' }) 替换为 @Injectable()

@Injectable()
export class AccountService {
    private userIdentity: any;
    private authenticated = false;
    private authenticationState = new Subject<any>();
    constructor(private languageService: JhiLanguageService, private sessionStorage: SessionStorageService, private http: HttpClient) {}

Answer 2

同样的事情发生在我身上，解决方案就是

-> Passing arrow function instead of regular function in the callback. Arrow functions don't have its own this.

正则函数和箭头函数的区别here

Answer 3

HttpClient 需要 HttpClientModule。只需在 AppModule 中导入即可。

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';
import { CoreModule } from './core/core.module';
import { HttpClientModule } from '@angular/common/http';
import { MatTreeModule } from '@angular/material';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    AppRoutingModule,
    CoreModule,
    MatTreeModule,
    FormsModule,
    ReactiveFormsModule,
    HttpClientModule //add this as fix, simple
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

Answer 4

我在有问题的服务内部注入时错误地使用了接口而不是 class 实现时遇到了类似的问题。

Angular 7 : 注入的服务未定义

Angular 7 : Injected service is undefined

dependency-injection

typescript

ecmascript-6

jhipster

angular