In the project I'm working on, there is a search button that triggers an API call when clicked. I want to ensure that if the button is clicked again while the previous API call is still in progress, the previous call will be cancelled and only the most recent API call will stay active. How can I achieve this functionality using TypeScript? Currently, I am attempting to use ngDestroy() when clicking the button, but it seems that this approach is not effective.
ngOnDestroy is a method triggered by Angular when a component is being destroyed (such as when the route changes or a ngIf condition is met). It is important to note that you should never manually call this method.
Instead of manually handling the cancellation of API calls, you can utilize the powerful switchMap operator provided by RxJS. This operator automatically cancels any previous observable when a new emission is received. In the context of triggering actions with a button click, you can set up a subject like so:
private submitSource: Subject<void> = new Subject();
public ngOnInit(): void {
this.submitSource.pipe(
switchMap(() => this.someService.someApiCall()
).subscribe(result => {
// Handle the result of the API call
});
}
public buttonClick(): void {
this.submitSource.next(null);
}
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