How to implement a debounce time in keyup event in Angular 6

Question

How to implement a debounce time in keyup event in Angular?

How can I implement a debounce time for a keyup event in my Angular 6 application? I'm looking to reduce the number of times a function is called while the user is typing in an input field. What is the best way to achieve this, and are there specific libraries or techniques I should consider using?

Answer 1

To implement a debounce time in keyup events we can firstly create a Debounce Service then inject the debounce service into our component after this we will implement debounce logic in our keyup event handler.

Let’s see how we can implement this :

1. Create a Debounce Service : Create a new service file named debounce.service.ts in our Angular project . Import the Observable and Subject from rxjs. Define a debounceTime method that takes a delay parameter and returns an observable. Inside the debounceTime method , create a new Subject and use the debounceTime operator to emit values only after the specified delay had passed.

2. Inject the Debounce Service into our component : Import the DebounceService into our component where we want to implement the debounce functionality. Inject the DebounceService into the component’s constructor.

3. Implement Debounce Logic in Our keyup event handler : In our component’s template , bind the keyup event to a method in our component. In the method, use the debounceTime method from the service to delay the execution of our code until the user has stopped typing for the specified duration.