How to call a http service after every 3 seconds in angular 12?-CodePudding

I want to get live data from a database onto a mat grid . I want to refresh the grid with live data every 3 seconds without manually refreshing the page .

I am trying to use subscriptions but it is giving me errors saying no initialization provided .

My TS -

  getDataForClients(name:string){
    this.dashboardService.getClientsData(name).subscribe(res=>{
      this.dataSource = new MatTableDataSource(res);
  })

setInterval and timer also giving error outputs .

I have used this is my service -

    public getClientsData(name:string){
  return timer(0, 5000)
  .pipe(
     switchMap(_ => this.http.get<any[]>('https://localhost:44395/api/StocksOrders/'   name)),
     catchError(error => of(`Bad request: ${error}`))
  );
}

But the output instead of for that passed variable it is giving for all the variables passed till now . It should only return array with 8 values , but it is returning other arrays as well .

}

How can i call this method every 3 seconds ?

CodePudding user response：

istead of setInterval you should use interval from RxJS

import { interval } from 'rxjs';

mySub: Subscription = null;
initializeIntervalDataForClients(name:string){
  if(this.mySub !== null){
    this.mySub.unsubscribe();
  }

  this.mySub = interval(3000).pipe(
    switchMap(i => this.dashboardService.getClientsData(name))
  ).subscribe(
    res => { 
      // do your stuff here 
    }
  );
}

CodePudding user response：

Try this, Its works for me

  ngAfterViewInit() {
    setInterval(() => {
      this.getDataForClients("simpleName");
    }, 3000);
  }