What is the best way to update a component in real time from another component?

Hello, I have two components named A and B. Component A has a dropdown menu with car models, while Component B has another dropdown menu with model years. When I select a car from the dropdown in Component A, the available years associated with that car should display. Everything is functioning correctly, but I am encountering an issue where if I change the year in Component B, Component A does not refresh immediately. The new values only appear after the page is reloaded. I have tried using ngonint() but it is not ideal due to the amount of methods inside. Can someone please suggest a solution? Thank you.

angulartypescript

Answer №1

Utilizing a service can assist with this issue.

Referencing the angular official documentation on Component Interaction, you can establish communication between components using a service.

I hope this information proves beneficial.

Answer №2

Utilize Subjects to achieve this.

Let's assume we have an Interface called dateRange

IDateRange {
   availableYear: string
}

Begin by creating a subject in commonService.ts as shown below

private updateLists = new Subject<IDateRange>();
updateListsObs = <Observable<IDateRange>>this.updateLists;

updateListFn(_dateRange : IDateRange ) {
 this.updateLists.next(_dateRange);
}

In Component A, inject CommonService and subscribe to the observable updateListsObs like so

this.CommonService.updateListsObs
.subscribe(
(response) => {console.log("You will receive the date range in response which can be used to filter the Car list in Component A")}
)

Then in Component B, inject CommonService and call UpdateListFn

let dateRange: IDateRange = {
 availableYear: "2018"
}
this.CommonService.updateListFn(dateRange);

For a more detailed explanation, you can check out this link

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