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JavaScript Object-Oriented JavaScript (2015) Practice Project Quiz Prototype

Cannot set property 'innerHTML' of null

I keep getting this error message in Dev tools in Google Chrome: Uncaught TypeError: Cannot set property 'innerHTML' of null I've looked over my code and I can't find a problem!

Here's a snapshot of my code... https://w.trhou.se/4566eakx5x

1 Answer

Daniel Jenkins
Daniel Jenkins
17,714 Points

Hi David, it looks to me as though you have too many options for the question answers for your html. You define three options for each question but the html only defines two 'p' elements for your choices, so when your loop gets to 'choice2' it fails as there is no element with id 'choice2'. The getElementById call is returning 'null' because it can't find anything with the given id.

Hope that helps.