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 (Retiring) Traversing the DOM Getting All Children of a Node with children

Shifat Kabir
Shifat Kabir
5,443 Points

Problem about children property

When I use that: const lis = listUl.children; Console give me that: Uncaught ReferenceError: listUl is not defined at app.js:9 But if I use that: const lis = document.getElementsByTagName('li'); Its work perfectly.

1 Answer

Steven Parker
Steven Parker
229,787 Points

You must define "listUl" first, before you can use it to reference the "children" attribute.

But your second solution saves a step and is more concise anyway.

Hi Steven,

How is the second solution of Shifat Kabir saves a step and is more concise? If you can elaborate, please so I can have an idea. Thanks!

Steven Parker
Steven Parker
229,787 Points

The single-line solution works because it gets a reference to the child elements directly (the "li" elements) and skips the need for a reference to the parent (the "listUl"),