We have an Gravity Forms form with two 'Calculation' product fields.
Veld ID 27 - Product - Calculation
( {Je wilt::8} ) / 100 ) * 35
Veld ID 28 - Product - Calculation
{payment_amount} - {payment_amount}
This results however in an blank page, the form is hidden. We see the following error in Firebug:
TypeError: expr is undefined
/wp-content/plugins/gravityforms/js/gravityforms.js?ver=1.6.7
Line 847
Any idea how we can fix this?
Your calculation looks to be missing a "(" or you have an extra ")" in it.
Does the form show and work in the form builder preview window? Do you have a link to the live form?
We have a link to the live form with the Calculation forms: https://cdaformulieren.nl/cdja/congres/
Did you check your calculation for the proper syntax? From what you posted here you are missing a parenthesis in the calculation for field 27. Is that a paste error here or is your actual formula incorrect?
As Rob explained, you have an error in your formula. You have mismatched parentheses. I think you want to do something like this:
[php]
{Je wilt::8} * 0.35or
[php]
( {Je wilt::8} / 100 ) * 35I'm not certain what your calculation should be, so I am unsure of there the parentheses need to be. One of those two formulas should work for you.