Implementing a debounce time for a service request

Question

Implementing a debounce time for a service request

I'm having an issue with the debounceTime method while trying to prevent multiple requests being sent to the server. The service is currently being called instantly without debouncing.

During a drag and drop event, I need to store positions using the saveWidgetsPosition function.

  drop(event: CdkDragDrop<string[]>) {
    if (event.previousContainer !== event.container) {
      transferArrayItem(event.previousContainer.data, event.container.data, event.previousIndex, event.currentIndex);
    } else {
      moveItemInArray(event.container.data, event.previousIndex, event.currentIndex);
    }

    this.saveWidgetsPosition(this.columns);
  }

This is the function used to save positions:

saveWidgetsPosition(columns: any[]) {
    const columnsLabels = columns.map(x => x.map(y => y.label));

    this.userService.saveWidgetsPosition({ user: this.user, columns: columnsLabels})
        .pipe(debounceTime(5000))
        .subscribe(res => console.log(res));
}

typescript rxjs

Answer 1

Answer №1

Your current approach needs to be adjusted. To optimize the execution of

this.userService.saveWidgetsPosition()

, consider debouncing it instead of handling the results after debouncing.

One possible solution is:

widgetPositions = new Subject<any>();
widgetPositions.pipe(
    debounceTime(5000),
    exhaustMap((data) => this.userService.saveWidgetPositions(data))
).subscribe(result => {
    console.log(result);
});

saveWidgetsPosition(columns: any[]) {
    const columnsLabels = columns.map(x => x.map(y => y.label));

    widgetPositions.next({ user: this.user, columns: columnsLabels });
}

Answer 2

Your current approach needs to be adjusted. To optimize the execution of

this.userService.saveWidgetsPosition()

, consider debouncing it instead of handling the results after debouncing.

One possible solution is:

widgetPositions = new Subject<any>();
widgetPositions.pipe(
    debounceTime(5000),
    exhaustMap((data) => this.userService.saveWidgetPositions(data))
).subscribe(result => {
    console.log(result);
});

saveWidgetsPosition(columns: any[]) {
    const columnsLabels = columns.map(x => x.map(y => y.label));

    widgetPositions.next({ user: this.user, columns: columnsLabels });
}

Answer 3

Answer №2

debounceTime is not designed to perform that function. It would be more appropriate to utilize delay instead.

debounceTime: Omit emitted values that occur within a specified time frame between outputs

The correct approach is to employ

<a href="https://www.learnrxjs.io/operators/utility/delay.html" rel="nofollow noreferrer">delay</a>

.
Your revised code snippet should look like this:

this.userService.saveWidgetsPosition({ user: this.user, columns: columnsLabels})
      .pipe(delay(5000))
      .subscribe(res => console.log(res));

Answer 4

debounceTime is not designed to perform that function. It would be more appropriate to utilize delay instead.

debounceTime: Omit emitted values that occur within a specified time frame between outputs

The correct approach is to employ

<a href="https://www.learnrxjs.io/operators/utility/delay.html" rel="nofollow noreferrer">delay</a>

.
Your revised code snippet should look like this:

this.userService.saveWidgetsPosition({ user: this.user, columns: columnsLabels})
      .pipe(delay(5000))
      .subscribe(res => console.log(res));

Implementing a debounce time for a service request

Answer №1

Answer №2

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