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 Making Changes to the DOM Set Inline Styles with the style Property

Posted by ilia kolbas
ilia kolbas
824 Points

why .document.getElementsByClassName(' ') instead of document.querySelector('. ') doesnt work? console shows a mistake

why .document.getElementsByClassName(' ') instead of document.querySelector('. ') doesnt work? console shows a mistake addEventListener is not a function, but when I CHANGE it to queryselector everything works as it should?

1 Answer

Steven Parker
Steven Parker
231,198 Points
Steven Parker
Steven Parker
231,198 Points

One major difference between these functions is that querySelector returns a reference to a single element, but getElementsByClassName returns an element collection (which is like an array).