Currently, I am working with a text box that triggers an HTTP call for each input character. However, my challenge lies in the fact that I need to be able to cancel the previous request if the user enters the next character before receiving a response.
If you want to achieve this, consider using the rxjs switchMap operator.
With switchMap, on each emission, the previous inner observable is canceled in favor of subscribing to a new one. This can be likened to switching to a new observable. It's especially useful for scenarios like typeaheads where the response of the previous request becomes irrelevant once a new input is received.
Here's an example:
// Implementing with RxJS v6+
import { interval, fromEvent } from 'rxjs';
import { switchMap } from 'rxjs/operators';
fromEvent(document, 'click')
.pipe(
// Restart counter on every click
switchMap(() => interval(1000))
)
.subscribe(console.log);
This demonstration is featured on the Angular University blog, showcasing how a new request supersedes and cancels out the previous one.
Once an HTTP request is sent to the server, it cannot be canceled as expected. The server will still attempt to fulfill the request even if you disregard the response.
However, there are scenarios where a streaming HTTP request can be terminated or when using two separate HTTP requests to start and cancel a job on the server can emulate cancellation (although this involves successful completion of both requests).
If looking for alternatives, consider exploring throttling or debouncing in JavaScript. These techniques ensure that a function is only called once per keypress, based on certain conditions like not being called within a specific time frame.
[UPDATE] While some tools allow for the "cancellation" of in-flight HTTP requests (like rxjs), keep in mind that this may not prevent the server from processing the call if it has already been received. Additionally, the ability to cancel requests depends on your specific HTTP implementation. More information can be found here.
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