Currently, I am utilizing the mouseenter and mouseleave events to control the opening and closing of my sidenav within the app. However, I have encountered issues because when hovering over the container quickly, these events are triggered multiple times, resulting in unexpected behavior with the sidenav. Is it possible to incorporate debounce into these events? If so, how can this be achieved?
To enhance your button, create a reference variable like this:
<button #btn>Click me</button>
Access the button in your component using @ViewChild:
@ViewChild('btn') btn: ElementRef;
Utilize fromEvent from rxjs to monitor the click action and apply the debounceTime operator:
ngAfterViewInit() {
fromEvent(this.btn.nativeElement, 'click').pipe(
debounceTime(2000) // 2 seconds
).subscribe(() => {
// do whatever you need
});
}
RXJS offers a handy function called FromEvent to convert events into streams. You need to create two streams, one for when the mouse enters and another for when it leaves.
To ensure the correct sequence of true false or false true is emitted, consider using both debounceTime and distinctUntilChanged.
@ViewChild('sizeMenu')
setSizeMenu(sizeMenu: ElementRef) {
let mouseEnter$ = fromEvent(sizeMenu.nativeElement, 'mouseenter').pipe(
mapTo(true));
let mouseLeave$ = fromEvent(sizeMenu.nativeElement, 'mouseleave').pipe(
mapTo(false));
this.mouseEvents$ = mouseLeave$.pipe(merge(mouseEnter$), debounceTime(this.DebounceTime), distinctUntilChanged());
};
Check out this example on stackblitz for reference.
If you want to implement a directive for debouncing events in Angular, you can create a custom directive like the one below. This example demonstrates how to debounce click events, but you can adapt it for any other type of event.
import { Directive, EventEmitter, HostListener, Input, OnDestroy, OnInit, Output } from '@angular/core';
import { Subject, Subscription } from 'rxjs';
import { debounceTime } from 'rxjs/operators';
@Directive({
selector: '[debounceClick]'
})
export class DebounceClickDirective implements OnInit, OnDestroy {
@Input()
public debounceClickTime = 500;
@Output()
public debounceClick = new EventEmitter();
private clicks = new Subject();
private subscription: Subscription;
constructor() { }
public ngOnInit() {
this.subscription = this.clicks.pipe(debounceTime(this.debounceClickTime)).subscribe((e: Event) =>
this.debounceClick.emit(e));
}
public ngOnDestroy() {
this.subscription.unsubscribe();
}
@HostListener('click', ['$event'])
public clickEvent(event: Event) {
event.preventDefault();
event.stopPropagation();
this.clicks.next(event);
}
}
To use this directive in your HTML template, follow the example below:
<input type="text" (debounceClick)="yourMethod()" debounceClickTime="1000" />
The debounceClickTime attribute is optional. If not specified, the default debounce time is set to 500ms.
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