Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript JavaScript and the DOM The Browser Environment Introduction to Browser Events

Gurveer Singh
Gurveer Singh
11,369 Points
Posted by Gurveer Singh
Gurveer Singh
11,369 Points

In this video ‘ introduction to browser event’

In this video listentoevevent was called with two argument. In the second argument function was declared but never called. How function worked without call

1 Answer

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

The 2nd argument to addEventListener is generally a callback, which is a reference to a function. The function isn't called immediately, but it will be when the event occurs. Defining a function with a function expression is a common way to provide the callback.

For more details, see the MDN page on addEventListener.