Event Handling Patterns

Let's explore common patterns for handling events effectively in React applications.

Preventing Default Behavior

Sometimes you need to prevent the browser's default action:

Event Delegation

Handle events on parent elements for better performance:

Debouncing Events

Limit how often a handler runs for frequent events:

Throttling Events

Limit handler execution to fixed intervals:

Controlled vs Uncontrolled Inputs

Two patterns for handling form inputs:

Exercise: Event Delegation

Exercise: Debounced Search

Exercise: Form Submission

Key Takeaways

1. preventDefault() - Stop default browser behavior for forms and links
2. Event delegation - One handler on parent using data attributes
3. Debouncing - Wait for pause in rapid events (typing)
4. Throttling - Limit execution rate for frequent events (scroll)
5. Validation - Check data before processing form submission