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titaniche
Asked:2020-09-14 20:35:37 +0000 UTC2020-09-14 20:35:37 +0000 UTC

角 CLI。自定义配置服务

  • 772

再会。

请帮我解决以下问题： 我有一个应用程序配置文件 - app.config.json 它包含一些有用的信息。还有一个尊重此文件结构的界面。此外，还有一项服务可以将文件中的数据加载到静态接口对象中。但是，当应用程序启动时，似乎没有发生下载。

app.config.json

{
  "appUrl": "http://localhost:8080/asterisk-prime",
  "routes": {
    "device": "device",
    "extension": "extension",
    "queue": "queue",
    "queueMember": "queueMember"
  },
  "apiEndpoints": {
    "device": "/api/device",
    "extension": "/api/extension",
    "queue": "/api/queue",
    "queueMember": "/api/queueMember"
  },
  "stompEndpoint": "/socket"
}

iapp.config.ts

export interface IAppConfig {
  appUrl: string;
  routes: {
    device: string,
    extension: string,
    queue: string,
    queueMember: string
  };
  apiEndpoints: {
    device: string,
    extension: string,
    queue: string,
    queueMember: string
  };
  stompEndpoint: string;
}

app.config.service.ts

@Injectable({
  providedIn: 'root'
})
export class AppConfigService {
  static settings: IAppConfig;

  constructor(private httpClient: HttpClient) {
  }

  loadConfig() {
    const configFile = 'src/assets/config/app.config.json';
    return new Promise<void>((resolve, reject) => {
      this.httpClient.get<IAppConfig>(configFile)
        .toPromise()
        .then(response => {
          AppConfigService.settings = response;
          LoggerService.log('Config was loaded');
          resolve();
        })
        .catch(err => {
          LoggerService.error('Error while loading config.', err);
          reject(`Could not load file '${configFile}': ${JSON.stringify(err)}`);
        });
    });
  }
}

app.module.ts

...
export function loadConfig(appConfigService: AppConfigService) {
  return () => appConfigService.loadConfig();
}
...
providers: [
    AppConfigService,
    {
      provide: APP_INITIALIZER,
      useFactory: loadConfig,
      deps: [AppConfigService],
      multi: true
    }
  ],
...

实际上，错误发生在路由初始化期间的路由模块中。

应用程序路由.module.ts

const routes: Routes = [
  {path: '', redirectTo: '/', pathMatch: 'full'},
  {path: '', component: HomePageComponent},
  {path: 'about', component: AboutPageComponent},
  {path: AppConfigService.settings.routes.device, loadChildren: './path/to/children.module#ChildrenModule'},
  {path: AppConfigService.settings.routes.extension, loadChildren: './path/to/children.module#ChildrenModule'},
  {path: AppConfigService.settings.routes.queue, loadChildren: './path/to/children.module#ChildrenModule'},
  {path: AppConfigService.settings.routes.queueMember, loadChildren: './path/to/children.module#ChildrenModule'}

浏览器错误：Cannot read property 'routes' of undefined。

angular

1 个回答

  1. Best Answer

    目前，我决定将除路由之外的所有内容移至单独的配置文件。留在应用程序内的路由。我使用声明的令牌通过路由实现配置。

    iapp.config.routes.ts

    export interface IAppConfigRoutes {
  routes: any;
}

    app.config.routes.ts

    export let APP_CONFIG_ROUTES = new InjectionToken('app.config.routes');

export const AppConfigRoutes: IAppConfigRoutes = {
  routes: {
    device: 'device',
    extension: 'extension',
    queue: 'queue',
    queueMember: 'queueMember'
  }
};

    app.module.ts

    export function loadConfig(appConfigService: AppConfigService) {
  return () => appConfigService.loadConfig();
}
...
providers: [
    AppConfigService,
    {
      provide: APP_INITIALIZER,
      useFactory: loadConfig,
      deps: [AppConfigService],
      multi: true
    },
    {
      provide: APP_CONFIG_ROUTES,
      useValue: AppConfigRoutes
    }
  ],
...

    在组件中使用 AppConfigRoutes（示例）：

    header.component.ts

    export class HeaderComponent implements OnInit {
  private readonly appConfig: any;
  readonly angularLogo = require('../../../../assets/images/angular-white-transparent.svg');
  menuItems: any[];

  constructor(@Inject(APP_CONFIG_ROUTES) appConfig: IAppConfigRoutes) {
    this.appConfig = appConfig;
  }

  ngOnInit() {
    this.loadMenus();
  }

  private loadMenus(): void {
    this.menuItems = [
      {name: 'Device', link: '/' + this.appConfig.routes.device},
      {name: 'Extension', link: '/' + this.appConfig.routes.extension},
      {name: 'Queue', link: '/' + this.appConfig.routes.queue},
      {name: 'Queue member', link: '/' + this.appConfig.routes.queueMember}
    ];
  }
}

    用法app-routing.module.ts基本上保持不变，只有对象发生了变化。

    ...
{path: AppConfigRoutes.routes.device, loadChildren: './path/to/children.module#ChildrenModule'},
...
    • -1

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