So, I've created a multipage form where:
I ask the user on page 1 to enter height, width.
I want to dynamically fill in a field on page 2 containing the area (ie height*width).
I've made my own wordpress add_shortcode function which returns using:
[=area height="variable1" width="variable2"]
which I want to use as a dynamic field on page 2
How can I fill in variable1 and variable2 coming from page1?
(set form to ajax)