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

Shifat Kabir
Shifat Kabir
5,443 Points
Posted by 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
231,248 Points
Steven Parker
Steven Parker
231,248 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.

Ned Marafawi
Ned Marafawi
7,995 Points

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
231,248 Points
Steven Parker
Steven Parker
231,248 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"),