Web Reference: The following snippet shows how a component can implement this interface to define an on-changes handler for an input property. While you should prefer computed and effect when working with signal-based inputs, the ngOnChanges method does include value changes for signal-based inputs. Are you curious about how ngOnChanges works and when to use it? Well, then you've come to the right place! In this comprehensive guide to Angular's ngOnChanges lifecycle hook, we'll explore how it works and why it's important, and I’ll explain how to use it effectively in your Angular applications. Jul 23, 2025 · In this article, we will see how to use OnChanges in Angular. The OnChanges lifecycle hook in Angular is triggered when the input properties of a component or directive change. It allows you to react to changes in the input values and perform necessary actions based on those changes.
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