Is there a way to detect the start of the subcription of a rxjs observable within the pipe?
I want to trigger a loading indicator when a http observable (destroyed when respone has been finalized) get subscribed.
Or do I have to create a wrapper observable for this action?
It depends on what RxJS version you're using. With RxJS < 7.3 you can use defer():
defer(() => {
loadingFlag = true;
return this.http.doyourrequest().pipe(
finalize(() => loadingFlag = false),
);
});
Since RxJS >= 7.3 you can use new event handlers for tap():
this.http.doyourrequest().pipe(
tap({
subscribe: () => loadingFlag = true,
finalize: () => loadingFlag = false,
}),
);
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