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 trialPatrick Vanegas
6,971 PointsWhy do we never pass an "event" to the function?
I am confused as to why this works even though Andrew never passed an "event" to the anonymous function.
1 Answer
Lars Reimann
11,816 Pointsthis
is always set regardless of whether we specify the event as a parameter. Behind the scenes jQuery is calling the handler as if it was a method of the element. You must not use arrow functions for this to work though:
$('#imageGallery a').click((event) => {
console.log($(this).attr('href'));
event.preventDefault();
});
This will just print undefined, because this
always points to the window object in this case and it does not have an href attribute. Note that I just pass in the event to prevent the default behavior of the browser, i. e. navigating to a new page.