Sending Data from Outside Form

[R51]

I have a form that I have put together for a client. It's a bit strange, insomuch as it's populated by a drag and drop mechanism written in Javascript. The items put into the form populate a textarea that can then be passed through a form action just like any other form.

 

However, I am not aware of a way that this form can work within the cart, so my plan was to create a product within the cart that has a text attribute, and then to have the contents of my text area passed to the cart and be stored in the cart using this attribute. Does that make sense?

 

Really, I just need to know how to set up my form to get it to pass to the cart properly (at least that's all I need for now :) )

 

Thanks for helping a newbie.