What is Event Handling in React? Complete Beginner's Guide (2026)
What is Event Handling in React? Event Handling in React is the process of responding to user actions by executing JavaScript functions. Whenever a user interacts with a React application—such as clicking a button, typing in a text box, submitting a form, or moving the mouse—React detects that action and calls a function to perform the required task. Whenever a user clicks a button, types in an input box, submits a form, moves the mouse, or presses a keyboard key, React detects that action and executes a function. This process is called Event Handling. For example, when a user clicks a Login button, React can validate the entered username and password. When a user types in a search box, React can display matching search results immediately. Without event handling, these interactions would not be possible, and the application would remain static. Basic Syntax of Event Handling function App() { function showMessage() { alert("Welcome to React!"); ...
