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 trialKade Rathbun
6,586 PointsDisplay an error message when there are no more list elements to remove?
I was wondering a basic way to display an error message once all task items are removed from the list? I see the console throws an error once all items are removed, so how could display an alert for example? Thanks :)
1 Answer
Steven Parker
231,198 PointsWhen there are no more items, the querySelector returns null, and attempting to perform the remove on that causes the error. You can easily test the value from querySelector and either remove it or issue a message:
const lastItem = document.querySelector("li:last-child");
if (lastItem)
lastItem.remove(); // it's not null, so remove it
else
alert("No more items!"); // otherwise alert