When are you getting the context to act upon the form? I would check out the post Using JSOM in Nintex Forms for O365​ as a start to get things connected. Let us know if this helps.

I'm waiting till page has fully loaded and running code with developer tools. I had a look at the post you linked, I can't even see NWF object. I've logged a support call, hopefully it's just something silly I'm doing and not a corrupt environment or something will post what comes back from support.

Thanks everyone for responses.

I made sure I was selecting objects inside the iframe with the dom selector before running code in the console, still no luck .

Hey everyone,

So after some more investigation, I have tested that the code is fine when you insert it into the form and run the form. It just doesn't work with developer tools. There may be a way to still debug it, but selecting the iframe and running the code doesn't work.

I'll post again when I find out more information. For now the workaround will be to develop and debug through Nintex, which is a pain having to publish each time and debug through alerts and logs haha. Other options is to save the file in SharePoint (permissions allowing) or to a CDN.

Hey everyone,

So I finally figured out that if you set a breakpoint in your code, you can run commands against the console. Usually when I'm just writing some quick JQuery and checking whether my selections are correct e.g. NWF$('.jsLeaveDuration').find('label').html(); I will write it into the console once the page has loaded, without debugging.

Must be because it's in an iFrame and without setting a breakpoint, the console window doesn't run against what is in the iFrame because it's not inside that scope?

Interesting...

The original question wasn't really answered, but I have marked my workaround as the response to help with people finding answers for the same issue