Queue events to fire every 350ms with RxJS
I have a keyboard event that causes an animation to play. It's possible for the user to produce more events than the rate that the animation plays so I want to create a queue that will eventually empty firing one by one after a certain amount of delay.
Desired marble diagram:
=================================================
user: START|a-b-c-----------------------------
result: START|-350ms--a--350ms--b--350ms--c-----
=================================================
The user fires 3 events rapidly (a b c). After event a fires, 350ms timer starts. After that timer is finishes, the result fires a and starts another 350ms timer. After that timer is done it fires b. Basically, if a timer is in progress, I want to add it to the queue and emit it later. The rate cannot exceed 350ms and I want every event.
I want to throttle the output of the events to 350ms but I don't want to use the throttle operator because I don't want to loose any events (I want a, b, and c to fire).
A Javascript RxJS solution is preferred but I'll accept any answer with Rx operators in any language.
javascript rxjs reactivex
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
add a comment |
I have a keyboard event that causes an animation to play. It's possible for the user to produce more events than the rate that the animation plays so I want to create a queue that will eventually empty firing one by one after a certain amount of delay.
Desired marble diagram:
=================================================
user: START|a-b-c-----------------------------
result: START|-350ms--a--350ms--b--350ms--c-----
=================================================
The user fires 3 events rapidly (a b c). After event a fires, 350ms timer starts. After that timer is finishes, the result fires a and starts another 350ms timer. After that timer is done it fires b. Basically, if a timer is in progress, I want to add it to the queue and emit it later. The rate cannot exceed 350ms and I want every event.
I want to throttle the output of the events to 350ms but I don't want to use the throttle operator because I don't want to loose any events (I want a, b, and c to fire).
A Javascript RxJS solution is preferred but I'll accept any answer with Rx operators in any language.
javascript rxjs reactivex
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
add a comment |
I have a keyboard event that causes an animation to play. It's possible for the user to produce more events than the rate that the animation plays so I want to create a queue that will eventually empty firing one by one after a certain amount of delay.
Desired marble diagram:
=================================================
user: START|a-b-c-----------------------------
result: START|-350ms--a--350ms--b--350ms--c-----
=================================================
The user fires 3 events rapidly (a b c). After event a fires, 350ms timer starts. After that timer is finishes, the result fires a and starts another 350ms timer. After that timer is done it fires b. Basically, if a timer is in progress, I want to add it to the queue and emit it later. The rate cannot exceed 350ms and I want every event.
I want to throttle the output of the events to 350ms but I don't want to use the throttle operator because I don't want to loose any events (I want a, b, and c to fire).
A Javascript RxJS solution is preferred but I'll accept any answer with Rx operators in any language.
javascript rxjs reactivex
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
I have a keyboard event that causes an animation to play. It's possible for the user to produce more events than the rate that the animation plays so I want to create a queue that will eventually empty firing one by one after a certain amount of delay.
Desired marble diagram:
=================================================
user: START|a-b-c-----------------------------
result: START|-350ms--a--350ms--b--350ms--c-----
=================================================
The user fires 3 events rapidly (a b c). After event a fires, 350ms timer starts. After that timer is finishes, the result fires a and starts another 350ms timer. After that timer is done it fires b. Basically, if a timer is in progress, I want to add it to the queue and emit it later. The rate cannot exceed 350ms and I want every event.
I want to throttle the output of the events to 350ms but I don't want to use the throttle operator because I don't want to loose any events (I want a, b, and c to fire).
A Javascript RxJS solution is preferred but I'll accept any answer with Rx operators in any language.
javascript rxjs reactivex
javascript rxjs reactivex
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
asked Nov 20 '18 at 19:23
Rico KahlerRico Kahler
4,51632033
4,51632033
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
This seems to do the trick:
import { fromEvent, concat, timer } from 'rxjs';
import { tap, concatMap, filter } from 'rxjs/operators';
fromEvent(document, 'keypress')
.pipe(
filter((e: KeyboardEvent) => e.code === 'Space'),
concatMap(() => timer(350))
).subscribe(console.log)
Blitz
Edit: The concat() operator is redundant. Removed.
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
This seems to do the trick:
import { fromEvent, concat, timer } from 'rxjs';
import { tap, concatMap, filter } from 'rxjs/operators';
fromEvent(document, 'keypress')
.pipe(
filter((e: KeyboardEvent) => e.code === 'Space'),
concatMap(() => timer(350))
).subscribe(console.log)
Blitz
Edit: The concat() operator is redundant. Removed.
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
add a comment |
This seems to do the trick:
import { fromEvent, concat, timer } from 'rxjs';
import { tap, concatMap, filter } from 'rxjs/operators';
fromEvent(document, 'keypress')
.pipe(
filter((e: KeyboardEvent) => e.code === 'Space'),
concatMap(() => timer(350))
).subscribe(console.log)
Blitz
Edit: The concat() operator is redundant. Removed.
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
add a comment |
This seems to do the trick:
import { fromEvent, concat, timer } from 'rxjs';
import { tap, concatMap, filter } from 'rxjs/operators';
fromEvent(document, 'keypress')
.pipe(
filter((e: KeyboardEvent) => e.code === 'Space'),
concatMap(() => timer(350))
).subscribe(console.log)
Blitz
Edit: The concat() operator is redundant. Removed.
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
This seems to do the trick:
import { fromEvent, concat, timer } from 'rxjs';
import { tap, concatMap, filter } from 'rxjs/operators';
fromEvent(document, 'keypress')
.pipe(
filter((e: KeyboardEvent) => e.code === 'Space'),
concatMap(() => timer(350))
).subscribe(console.log)
Blitz
Edit: The concat() operator is redundant. Removed.
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
edited Nov 20 '18 at 20:32
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
answered Nov 20 '18 at 19:31
PhixPhix
4,46121845
4,46121845
add a comment |
add a comment |
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