Question

我正在按照本文https://devblogs.microsoft.com/premier-developer/angular-how-to-editable-config-files/进行动态应用配置。浏览器返回json文件上找不到的404，尽管可以直接访问。

我将配置放在资产文件夹中：

src / assets / config / config.json

{
    "api": {
        "baseUrl": "http://xx.com"
    }
}

我有一个加载config.json的服务：

src / app / services / app.config.service.ts

import { Injectable } from '@angular/core'
import { HttpClient } from '@angular/common/http'
import { IAppConfig } from '../models/appConfig'
import { environment } from 'environments/environment'

@Injectable()
export class AppConfigService {
    static settings: IAppConfig = {} as IAppConfig

    constructor(private http: HttpClient) {}

    load() {
        const jsonFile = `assets/config/config.json`
        return new Promise<void>((resolve, reject) => { 
            this.http
                .get(jsonFile)
                .toPromise()
                .then((response: any) => {
                    console.log(response, response.json())
                    AppConfigService.settings = <IAppConfig>{
                        ...environment,
                        ...response,
                    }
                    resolve()
                })
                .catch((response: any) => {
                    console.log(response)
                    reject(
                        `Could not load app configuration file '${jsonFile}': ${JSON.stringify(
                            response
                        )}`
                    )
                })
        })
    }
}

该服务用于APP_INITIALIZER：

src / app / app.module.ts

import { AppConfigService } from './services/app.config.service'

...
providers: [
        { provide: LOCALE_ID, useValue: 'da' },
        AppConfigService,
        {
            provide: APP_INITIALIZER,
            useFactory: initializeApp,
            deps: [AppConfigService],
            multi: true,
        },
    ],

...

我通过ng serve服务该应用。我可以使用http://localhost:4200/assets/config/config.json直接访问它。但是浏览器控制台抱怨：

ERROR Could not load app configuration file 'assets/config/config.json': {"body":{"error":"Collection 'config' not found"},"url":"assets/config/config.json","headers":{"normalizedNames":{},"lazyUpdate":null},"status":404,"statusText":"Not Found"}
defaultErrorLogger @ core.js:15724
setTimeout (async)
scheduleTask @ zone.js:2302
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:410
onScheduleTask @ zone.js:301
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:404
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:238
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMacroTask @ zone.js:261
scheduleMacroTaskWithCurrentZone @ zone.js:1245
(anonymous) @ zone.js:2317
proto.<computed> @ zone.js:1569
(anonymous) @ delay-response.js:16
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.__tryOrUnsub @ Subscriber.js:196
push../node_modules/rxjs/_esm5/internal/Subscriber.js.SafeSubscriber.error @ Subscriber.js:147
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber._error @ Subscriber.js:80
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.error @ Subscriber.js:60
(anonymous) @ backend.service.js:278
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable._trySubscribe @ Observable.js:43
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:29
push../node_modules/rxjs/_esm5/internal/operators/map.js.MapOperator.call @ map.js:18
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
(anonymous) @ delay-response.js:8
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable._trySubscribe @ Observable.js:43
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:29
(anonymous) @ subscribeTo.js:21
subscribeToResult @ subscribeToResult.js:11
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._innerSub @ mergeMap.js:74
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext @ mergeMap.js:68
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next @ mergeMap.js:51
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/operators/tap.js.TapSubscriber._next @ tap.js:51
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/operators/take.js.TakeSubscriber._next @ take.js:40
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/operators/filter.js.FilterSubscriber._next @ filter.js:38
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
push../node_modules/rxjs/_esm5/internal/BehaviorSubject.js.BehaviorSubject._subscribe @ BehaviorSubject.js:22
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable._trySubscribe @ Observable.js:43
push../node_modules/rxjs/_esm5/internal/Subject.js.Subject._trySubscribe @ Subject.js:89
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:29
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable._subscribe @ Observable.js:78
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:28
push../node_modules/rxjs/_esm5/internal/operators/filter.js.FilterOperator.call @ filter.js:15
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
push../node_modules/rxjs/_esm5/internal/operators/take.js.TakeOperator.call @ take.js:24
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
push../node_modules/rxjs/_esm5/internal/operators/tap.js.DoOperator.call @ tap.js:18
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapOperator.call @ mergeMap.js:29
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
(anonymous) @ subscribeTo.js:21
subscribeToResult @ subscribeToResult.js:11
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._innerSub @ mergeMap.js:74
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._tryNext @ mergeMap.js:68
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapSubscriber._next @ mergeMap.js:51
push../node_modules/rxjs/_esm5/internal/Subscriber.js.Subscriber.next @ Subscriber.js:54
(anonymous) @ scalar.js:5
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable._trySubscribe @ Observable.js:43
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:29
push../node_modules/rxjs/_esm5/internal/operators/mergeMap.js.MergeMapOperator.call @ mergeMap.js:29
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
push../node_modules/rxjs/_esm5/internal/operators/filter.js.FilterOperator.call @ filter.js:15
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
push../node_modules/rxjs/_esm5/internal/operators/map.js.MapOperator.call @ map.js:18
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.subscribe @ Observable.js:24
(anonymous) @ Observable.js:98
ZoneAwarePromise @ zone.js:910
push../node_modules/rxjs/_esm5/internal/Observable.js.Observable.toPromise @ Observable.js:96
(anonymous) @ app.config.service.ts:17
ZoneAwarePromise @ zone.js:910
push../src/app/services/app.config.service.ts.AppConfigService.load @ app.config.service.ts:14
(anonymous) @ app.module.ts:27
push../node_modules/@angular/core/fesm5/core.js.ApplicationInitStatus.runInitializers @ core.js:16739
(anonymous) @ core.js:17774
_callAndReportToErrorHandler @ core.js:17867
(anonymous) @ core.js:17772
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
onInvoke @ core.js:17299
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:390
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
push../node_modules/@angular/core/fesm5/core.js.NgZone.run @ core.js:17213
push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModuleFactory @ core.js:17763
(anonymous) @ core.js:17803
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invoke @ zone.js:391
push../node_modules/zone.js/dist/zone.js.Zone.run @ zone.js:150
(anonymous) @ zone.js:889
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.invokeTask @ zone.js:423
push../node_modules/zone.js/dist/zone.js.Zone.runTask @ zone.js:195
drainMicroTaskQueue @ zone.js:601
Promise.then (async)
scheduleMicroTask @ zone.js:584
push../node_modules/zone.js/dist/zone.js.ZoneDelegate.scheduleTask @ zone.js:413
push../node_modules/zone.js/dist/zone.js.Zone.scheduleTask @ zone.js:238
push../node_modules/zone.js/dist/zone.js.Zone.scheduleMicroTask @ zone.js:258
scheduleResolveOrReject @ zone.js:879
ZoneAwarePromise.then @ zone.js:1012
push../node_modules/@angular/core/fesm5/core.js.PlatformRef.bootstrapModule @ core.js:17803
./src/main.ts @ main.ts:12
__webpack_require__ @ bootstrap:83
0 @ main.ts:13
__webpack_require__ @ bootstrap:83
checkDeferredModules @ bootstrap:45
webpackJsonpCallback @ bootstrap:32
(anonymous) @ main.js:1
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-更新-

我找到了自己的解决方案，该问题在下面发布。

Answer 1

尝试

 load() {
        const jsonFile = `assets/config/config.json`
        return new Promise<void>((resolve, reject) => { 
            this.http
                .get(jsonFile)
                .toPromise()
                .then((response: any) => {
                   var responseData =  response.json() | response;
                    AppConfigService.settings = <IAppConfig> responseData;
                    resolve();
                })
                .catch((response: any) => {
                    console.log(response)
                    reject(
                        `Could not load app configuration file '${jsonFile}': ${JSON.stringify(
                            response
                        )}`
                    )
                })
        })
    }

Answer 2

我自己的解决方案：

问题相当简单。我正在使用angular In Memory API插件来模拟所有api请求，直到真正的API准备就绪为止。这意味着服务将捕获所有http请求，而不是返回我在本地定义的模拟数据。因此，错误消息Collection 'config' not found很有道理，因为我没有称为“ config”的模拟数据集合。

因此解决方案是对内存API使用设置passThruUnknownUrl：

src / app / app.module.ts

imports: [
    ...
    HttpClientInMemoryWebApiModule.forRoot(InMemoryDataService, {
            passThruUnknownUrl: true,
        }),
    ...

现在，未在本地定义的集合将通过外部传递。

找不到“ src / assets”文件夹中的JSON文件

2 个答案: