In my Angular setup, there is a component that tracks changes in its route parameters. Whenever the params change, it extracts the ID and triggers a function to fetch the corresponding record using a promise. Once the promise resolves, the component updates a property for data binding purposes.
However, I have noticed instances where responses arrive out of order, causing confusion. Here's a snippet of the code:
ngOnInit() {
this.route.params.subscribe((params) => {
const id = params['id'];
console.log('processing', id);
this.service.getPerson(id).then((person) => {
console.log('processed id', id);
this.person = person; // issues with order here
}
});
}
For example, imagine I am filtering results by name in a textbox while the app navigates, fetching IDs associated with names. Sometimes, the sequence looks like this:
processing 1
processing 2
processed 2
processed 1 <---- ISSUE
How can I elegantly tackle this problem? One solution could involve transforming promises into observables and attempting cancellation, but that might be cumbersome. I'm exploring options for serializing subscriptions to prevent overlapping 'processing' operations as one completes before the next starts.