After upgrading to Angular 6, I attempted to implement ForkJoin in my project. In my service file, I included the following code:
import { forkJoin } from 'rxjs/observable/forkJoin';
However, it seems to be unable to recognize it and I encountered this error message:
...ForkJoin has no exported member
Is there a way to resolve this issue?
Make a simple adjustment to your import statement -
import {forkJoin} from 'rxjs';
Rxjs 6 has introduced easier import paths and more user-friendly operator methods, eliminating the need for using the Observable patch.
Instead of using:
return Observable.forkJoin( this.http.get('jsonplaceholder.typicode.com/posts'), this.http.get('jsonplaceholder.typicode.com/users') );
You can now simply write:
return forkJoin(this.http.get('jsonplaceholder.typicode.com/posts'), this.http.get('jsonplaceholder.typicode.com/users'));
I hope you find this information helpful!
RxJS 6 introduces new and simplified import paths, eliminating chainable operators in favor of pipeable operators. This structural change enhances the library's overall tree-shakability, resulting in smaller bundle sizes.
To ensure compatibility, update your imports as shown below:
import { forkJoin } from 'rxjs';
Here are a few more examples of using RxJS when upgrading to Angular:
// Creation and utility methods
import { Observable, Subject, pipe } from 'rxjs';
// Operators now sourced from `rxjs/operators`
import { map, takeUntil, tap } from 'rxjs/operators';
service.ts:
import { HttpClient } from '@angular/common/http';
import {forkJoin} from 'rxjs';
constructor(private http: HttpClient) { }
fetchDetails(){
let url1 ="../assets/sample.json";
let url2 ="../assets/sampledata.json";
//return this.http.get(url);
return forkJoin(this.http.get(url1),
this.http.get(url2));
}
component.ts:
import { Component,OnInit } from '@angular/core';
import { CommonServiceService } from './common-service.service';
@Component({
selector: 'app-root',
templateUrl: './app.component.html',
styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
secondData: any;
title = 'app';
myData:any;
constructor(private service: CommonServiceService) {}
ngOnInit(){
this.service.fetchDetails().subscribe(response=>{
this.myData= response[0];
console.log(this.myData);
this.secondData = response[1];
console.log(this.secondData);
})
}
}
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