angular-services

来源： https://stackoverflow.com/questions/64274610/angular-use-multiple-instances-of-service-in-parent-to-child-components

来源： https://stackoverflow.com/questions/63819086/how-can-i-put-data-into-nested-json-in-angular

来源： https://stackoverflow.com/questions/60139086/send-data-from-service-to-observable-get-request

来源： https://stackoverflow.com/questions/60139086/send-data-from-service-to-observable-get-request

问题 I need to call 4 different API's on a single function which is need to execute one after another as my previous API result will use the next Call as a param. For example: I have a call API for geo Ip, then I need to call an another API which I need to pass lat and long which I have got from first API call. How can I achieve this task on angular 4? I heard about some methods like flatmap and forkjoin. Is this method can use? (I didn't have any code as I am little bit confused). 回答1: You can do

问题 I need to call 4 different API's on a single function which is need to execute one after another as my previous API result will use the next Call as a param. For example: I have a call API for geo Ip, then I need to call an another API which I need to pass lat and long which I have got from first API call. How can I achieve this task on angular 4? I heard about some methods like flatmap and forkjoin. Is this method can use? (I didn't have any code as I am little bit confused). 回答1: You can do

问题 I have a service to pass data between components and when called it works but when i reload the service data gets reset.So when i searched on reload the memory is reset so is there a way to persist data even after reload without using any client side storage ? One thing i am curious is that can i achieve this using rxjs but i am not sure how this would help ?I fear to use localstorage because the data will be mostly objects or array and not user id or session id.Any inputs on this would be

问题 I have a service to pass data between components and when called it works but when i reload the service data gets reset.So when i searched on reload the memory is reset so is there a way to persist data even after reload without using any client side storage ? One thing i am curious is that can i achieve this using rxjs but i am not sure how this would help ?I fear to use localstorage because the data will be mostly objects or array and not user id or session id.Any inputs on this would be

问题 It works fine in injecting into components. problem occurs in service injection. I am using runtime configuration for end points.it works in components.i can able to change in runtime but throws an error when injecting in other services global export class AppConfigService { static settings: IAppConfig; constructor(private http: HttpClient) {} load() { const jsonFile = `../assets/config/config.json`; return new Promise<void>((resolve, reject) => { this.http.get(jsonFile).toPromise().then(

问题 I'm expecting Angular to wait until my loadConfig() function resolves before constructing other services, but it is not. app.module.ts export function initializeConfig(config: AppConfig){ return () => config.loadConfig(); } @NgModule({ declarations: [...] providers: [ AppConfig, { provide: APP_INITIALIZER, useFactory: initializeConfig, deps: [AppConfig], multi: true } ] }) export class AppModule { } app.config.ts @Injectable() export class AppConfig { config: any; constructor( private