在Angular中,如何在生产环境中创建可配置属性文件以读取属性? [英] In Angular how to Create a Configurable Property file to read a property, in production environment?
问题描述
在我的应用程序中,我创建了appMessages.ts,其中包含一个变量,如:
In my application, I have created appMessages.ts, which holds a variable like:
export const appMessages = {
my_url: 'http://localhost:8080/myApp',
}
我基本上是用它来进行REST调用的.在实际生产环境中,变量值会不断变化,并且需要可配置.如果我使用appMessages.ts,并使用
I`m basically using this to make REST calls. In real production environment, The variable value keeps changing, and needs to be configurable. If I use appMessages.ts, and create a production bundle, using
ng build --prod
问题是,appMessages.ts不再可配置.有没有一种Angular方式来创建可配置的属性文件,可以根据当前的开发环境使用"my_url"对其进行动态配置?
Problem is, appMessages.ts is not configurable anymore. Is there an Angular way to create a configurable property file, which can be configured dynamically with 'my_url' depending on the current development environment?
能否在部署产品后读取某种属性文件?
Can some kind of property file, which can be read after the product has been deployed?
推荐答案
您可以在src目录中创建以下config.json,然后使用APP_INITIALIZER提供程序.
You can create the following config.json in the src directory and then use the APP_INITIALIZER provider.
{
"myUrl": "http://172.22.251.207:20235"
}
app.module.ts
app.module.ts
...
export function initConfig(config: AppConfigService) {
return () => config.load();
}
...
providers: [
{
provide: APP_INITIALIZER,
useFactory: initConfig,
deps: [AppConfigService],
multi: true
}]
...
app-config.service.ts
app-config.service.ts
@Injectable({
providedIn: 'root'
})
export class AppConfigService {
private config: Config = null;
public configSubject: Subject<any> = new Subject<any>();
constructor(private http: HttpClient) { }
public load() {
return this.http.get(environment.deployUrl + 'config.json')
.toPromise()
.then((config: any) => {
this.config = config;
this.configSubject.next(this.config);
})
.catch((err: any) => {
console.error('ERROR: ' + err);
})
}
getMyUrl() {
return this.config.myUrl;
}
}
export class Config {
myUrl: string;
}
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