Javascript actions on form fields

[BalooRM]

Similar to Discussion #2157 (is there any way to add Document level Javascript?), I have created a form that contains text fields with some fields that need to be verified at entry as numbers. In Adobe Acrobat Pro, I can edit the properties of the numeric form field to specify decimal places, percentage, and currency formats. In practice, the Acrobat-modified PDF prevents typing of alphabetic characters in these numeric fields. Is there a similar capability using PyMuPDF low-level interface calls?

What is the alternative to the OpenAction key that is needed here when creating the JS reference and adding it to the catalog?

UPDATE: Further investigation has determined that the AFNumber_Format() and AFNumber_Keystroke() functions (below) are unique to the Acrobat API. I will be investigating use of equivalent/similar functions.

Are xref objects, such as the following supported?

<</JS(AFNumber_Format\(0, 0, 0, 0, "", true\);)/S/JavaScript>>

<</JS(AFNumber_Keystroke\(0, 0, 0, 0, "", true\);)/S/JavaScript>>

<</AA<</F 7 0 R/K 8 0 R>>/FT/Tx/Kids[26 0 R]/T(Numeric.field1)>>