I've combed a ton of the pages on here, and still am incapable to get my explicit validator to work.
Basically, when the submit button is clicked, I want the script to verify a radio is checked, if one is checked to do nothing.
You won't be able to do this because you aren't ever actually getting your checked value with this line.
On a side note, I'll disagree with the blanket statement that you should check a radio button by default.
For example in a survey, you want the user to explicitly choose an answer. @Jon P - Radio button group represents a 1 of many selection like a single-select list or dropdown.
Its best to always have exactly one radio button selected.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).
A friend recently asked for a code sample showing Java Script being used to client-side validate the radio inputs of an HTML form.
However, should you need to check for null or undefined, you should use typeof and strict comparison with === After reading your comment - I noticed one other thing.