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Hi, I've just changed from C6 to C7 and I'm rebuilding my forms. But I'm having trouble finding a functionality I used in C6.

I have several form variables of type array that I need to validate at submission. I need to check if each array contains a specific number of elements. These variables are defined in custom HTML form elements.

in C6, there was a "Validate Data" item that could be placed in the "Submit" action. In the "Fields setup" field of that item I could specify each array, a pre-defined validation rule, plus the error message in a format like:

ARRAYNAME/RULENAME:MESSAGE

Like this example:

CategoryArray/array_contains_three_elements:You must select a total of THREE projects for this category. Please review your selections.

In C7, the Action Editor no longer includes a "Validate data" item. The "Submit" element in the View Editor also doesn't include this. I did find a "Validate Fields" option under form Settings > Behaviors > Data, but it is not configurable. I assume this only toggles validation on/off for validation definitions available in specific field types under "Behaviors", but the HTML element doesn't include a "Validation" option.

So, how in C7 can I validate the size of a form variable array at form submission?

Update: I just found this in the C6 documentation. Field validation with custom defined rules is EXACTLY what I can't figure out how to do in C7

https://www.chronoengine.com/faqs/chronoforms/chronoforms6/validating-fields

you may try to use the "Custom function" validation and provide either a javascript or php function

OK, so where exactly do I find this "Custom function" validation? The variables I need to validate are defined in a custom HTML element, and that element has no Behaviors->Validation tab? And there is no Submit action where I can attach a custom function?