This PRO option is available since version 1.9.15

If you add the disable_on_hide attribute to a group, all the fields within that group will be disabled when the group is hidden.

As per the HTML specs, a disabled field will never be submitted.

When should I use disable_on_hide?

By default, it is a very bad idea to submit a form with multiple fields that share the same name. As a work-around, you can design your form so that fields with the same name will never be visible at the same time.

With CF Free or pre-1.9.15 versions of CF Pro, all fields will be submitted. If, however, you have a good reason to exclude certain fields from being submitted when they are not visible, you can put them inside a group with the disable_on_hide attribute.


In the example below we have 2 fields named state. But, by using disable_on_hide and by making sure that both fields will never appear at the same time, there is no need to make the field names unique.


    Form Code

    [radio country use_label_element "US" "Canada"]
    [group state-us disable_on_hide]
      [select state "Alaska" "Oklahoma"]
    [group state-canada disable_on_hide]
      [select state "Alberta" "BC"]

    Conditional Fields (Text)

    show [state-us] if [country] equals "US"
    show [state-canada] if [country] equals "Canada"

    Edit this form in the form tester