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[英]RxJS - Tell observable to wait for other observable to emit non null value
[英]How to tell an RxJS Observable timer to emit the next in sequence immediately
我非常努力地告訴 RxJS 計時器移動到下一個序列,但無濟於事。 有人可以幫我解決這個問題。 我已經在如何做到這一點上發揮了我的智慧。 但沒有管理它。 這是一個代碼示例,解釋了我正在嘗試做什么。 我試過科目。 我有無論我嘗試什么,似乎您都必須以某種方式丟棄訂閱並重新啟動,即使如此? 我在下面代碼中的評論應該解釋我希望實現的目標。
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
}
});
}
}
如果我正確理解您的問題,您想在 RxJS 中的特定時間間隔后發出一個事件,您可以評估throttleTime。
您可以在他們的文檔中找到類似的示例: https : //rxjs-dev.firebaseapp.com/guide/overview
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