如何告诉 RxJS Observable 计时器立即按顺序发出下一个

Question

I have tried very hard to tell a RxJS timer to move onto the next sequence to no avail. Could someone please help me out with this one. I have busted my wits on how to do this. But have not managed it. Here is a sample of code explaining what I am trying to do. I have tried Subjects. I have No matter what I try it seems that you have to somehow throw the subscription away and restart, Even then how?? My comments in the code below should explain what I wish to achieve.

import { Component, OnInit } from '@angular/core';
import { timer } from 'rxjs';
import { takeWhile } from 'rxjs/operators';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})
export class AppComponent implements OnInit {
    title = 'testAngular4';
    private condition = false;

  ngOnInit(): void {
    timer(0, 15000).pipe(
      takeWhile((val) => {
      console.log('inside takeWhile', ' val is ', val);
      return val < 30000;
    })).subscribe(value1 => {
      console.log(' subject subscription value is ', value1);
      timer(300, 3000).subscribe((value2) => {
        // Do something here
        console.log(' inside inner timmer subscribe and value is ', value2);
        // How to tell the above timer to emit next value before the 3 seconds
        // have elapsed. This would obviously be based on some condition
        if (this.condition) {
          // Emit the next value in the inner timer sequence above.
          // I mean don't wait any longer - move on. Emit
        }
      });

      // How to tell the above timer to emit next value before the 3 seconds
      // have elapsed. This would obviously be based on some condition
      if (this.condition) {
        // Emit the next value in the outer timer sequence above
        // I mean don't wait any longer - move on. Emit
      }
    });
}

}

Answer 1

If I understood your problem correctly, you want to emit an event after certain time interval in RxJS, you can evaluate throttleTime.

You can find a similar example in their documentation: https://rxjs-dev.firebaseapp.com/guide/overview