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February 10, 2026
8 min read

Building Event-Driven Applications

Event-driven applications are at the heart of modern web development. They allow users to interact with data in real-time and create dynamic experiences.

SimpleCalendarJS provides a robust event system that makes it easy to build event-driven applications. You can listen to user interactions, respond to calendar changes, and trigger custom logic based on calendar events.

The library provides several callback functions that you can use to respond to user actions. For example, onEventClick is triggered when a user clicks on an event, onSlotClick is triggered when a user clicks on an empty time slot, and onViewChange is triggered when the calendar view changes.

By leveraging these callbacks, you can create powerful workflows. For instance, you could open a modal to display event details when a user clicks on an event, or show a form to create a new event when they click on an empty slot.

Events in SimpleCalendarJS are highly customizable. You can set custom colors, tooltips, descriptions, and even pass additional metadata that your application can use.

One powerful pattern is to use the calendar as a visual interface for managing your application data. Users can see their schedule at a glance, drag events to reschedule them, and quickly add new items.

Remember to always validate user input and handle errors gracefully. Event-driven applications should provide clear feedback to users and handle edge cases appropriately.