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!

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) Making Changes to the DOM DOM Manipulation

Julien Arseneau
seal-mask
.a{fill-rule:evenodd;}techdegree
Julien Arseneau
Full Stack JavaScript Techdegree Student 5,200 Points

What is wrong with the code?

It says: ''There was an error with your code: TypeError: 'null' is not an object (evaluating 'document.getElementById(newParagraph).className = 'panel'')''.

3 Answers

Antonio De Rose
Antonio De Rose
20,884 Points

number one, please try to use the markdown sheets, when you paste / write code, that way, it makes the readability higher to all.

Am hoping the issue, that you have is with the task 2.

the below is your code, is what I assume (evaluating 'document.getElementById(newParagraph).className = 'panel'')''.

now the question Set the class of panel to the newParagraph.

now that the question asks to set the panel, on the newParagraph, I'd forget about the document.getElementById part, and will try to work on the newParagraph, it already have got a reference to a 'P', which was set in the task 1

newParagraph.xxxxxxxxx = "panel";

//xxxxxxxxx = is for you to figure out.

So basically what you're doing is setting the attribute of the newParagraph. If you remember from prior videos to set the class name to a new name you use this code -->

newParagraph.className = 'panel';