Make Your Page Interactive
Learn how JavaScript listens for user actions and changes a page without reloading it.
1. Select an element
Use document.querySelector to get a button, input or other element.
2. Listen for events
Attach an event listener for actions such as click or input.
3. Change the interface
Update text, classes or attributes based on user input.
4. Validate input
Check user-provided values before processing them.
5. Keep code modular
Put reusable behavior in JavaScript files rather than large inline scripts.