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Field type 'Calculation' - TypeError: expr is undefined

  1. 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?

    Posted 7 years ago on Friday September 28, 2012 | Permalink
  2. 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?

    Posted 7 years ago on Friday September 28, 2012 | Permalink
  3. We have a link to the live form with the Calculation forms: https://cdaformulieren.nl/cdja/congres/

    Posted 7 years ago on Monday October 1, 2012 | Permalink
  4. 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?

    Posted 7 years ago on Tuesday October 2, 2012 | Permalink
  5. This is not a paste error. It is the code we use in the form.

    Posted 7 years ago on Wednesday October 3, 2012 | Permalink
  6. 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} * 0.35

    or

    [php]
    ( {Je wilt::8} / 100 ) * 35

    I'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.

    Posted 7 years ago on Wednesday October 3, 2012 | Permalink