Hey there Webflowers,
I would like to build a dynamic form with conditional questions (pop up of questions depends on the answers to earlyer questions).
3rd party providers (Jotform, etc.) have nice solutions to this challange, but there i have a problem with tracking (connection of 3rd party “thank you site” with Analytics is not possible…)
Or is custom code the only solution? If yes, do you maybe have a good source for a “javascript analphabet” like me? 
BR: Balazs
Hello @Balazs ,
Welcome to the Forum! Glad you could join us. 
I have some client sites that needed this functionality with conversion tracking. I turned to a product called Machform. It is a self hosted or cloud hosted form engine with lots of features. It does require PHP and MySql to work. You can embed tracking codes on a form by form basis.
Hi Jeff… I noticed that you have used Machform in your webflow sites. Does self hosted through Machform work well with Webflow hosing plans?
@HazeDesign - Machform works just fine using the Javascript embed option. I use it on lots of sites and choose to use SES for mail delivery since it handles PPC forms and such. A simple VPS with 1GB at Vultur or Digital Ocean should do the trick unless you have really busy form submissions. I opt for 2GB instances and have no problem. One install can handle lots of sites and you can provide access to a single form per user as needed.
Happy 2023! I’m way late to this thread, but figured an updated answer could help future readers.
I I’m waaaaaaay too late to help you Fiona, but figured I’d post for future readers.
You can use Webflow interactions to show/hide inputs in your form, and then use the javascript from the article below to change wether they are required or not. If the inputs stay hidden, then they are not required. It’s really handy to be able to control which sections are visible just using Webflow interactions 