call keyup event with delay in angular
Welcome to the Observable's world. Just use Observable to get the desired result. Get the reference of your input in the component and use this code. debounceTime
will let the event to trigger at least after 1 second
from the previous trigger. It will let you not to fire on every keyup
when user types fast.
Observable.fromEvent(yourInput, 'keyup').debounceTime(1000).subscribe(value => /* */)
In the subscribe
method you can write your logic. The value
is the value of the input.
This solution works for me
View Template.html
<input type="text" placeholder="Filter..." class="form-control" [(ngModel)]="filter" (input)="searchChange($event.target.value, true)">
<button class="btn btn-primary" type="button" (click)="searchChange(filter, false)"><i class="fa fa-search"></i></button>
Comonent.ts
filter= '';
private timer: any;
searchChange(filter: string, to = false) {
filter = filter.toLowerCase();
if (to) {
clearTimeout(this.timer);
this.timer = setTimeout(() => {
this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
}, 400);
} else {
this.valuesFilter = this.allValues.filter(f => f.field.toLowerCase().includes(filter));
}
}
View template.html
<input type="text" [(ngModel)]="searchedKPI" (keyup)="searchConfigTree()" #something>
component.ts (do not forget implement the AfterViewInit)
source: any;
@ViewChild("something") something:ElementRef;
ngAfterViewInit(): void {
this.source = fromEvent(this.something.nativeElement, 'keyup');
this.source.pipe(debounceTime(1200)).subscribe(c =>
{
list = list.filter(item => item.label.toLocaleLowerCase().includes(this.searchedKPI.toLocaleLowerCase())).slice();
}
);
}