I recently finished upgrading a Django 1.9.6 project to 4.0.5. Everything is finally working well with one minor glitch. I have a function (JavaScript) that is called from within a form. The code uses an tag. I've used both href= and onclick=. Everything works when called from a desktop platform; Windows, Mack, or Linux. With a mobile platform like iOS or Android the link doesn't respond at all. Other controls on the page work fine. I compared the page with the original code and both versions are identical.

I am not the original author of the code. I have to assume that this did work at one point as the owner has pointed it out to me. I've never run across something like this before and I'm at a bit of a loss as to where to look. Any suggestions would be greatly appreciated. Thanks in advance!