mechanism of required column of PDF

May the Portuguese and Spaniards forgive me, I forgot about the unexpected total power outage.
But in that case, only battery-powered computers leave enough time to save.

😉

"users can still click "save" without filling in these required fields"

Fortunately, because a user may have many good reasons for wanting to save a form before completing it in full:
- go to lunch
- go to a meeting
- finish the next day
- respond to an urgent request
- fire alarm
- network or power cut alert
Etc.

If you want to validate the required fields before saving (or printing), you can use this (paid-for) tool I've developed:

https://www.try67.com/tool/acrobat-validate-required-fields-before-printing-or-saving

It won't prevent the file from being printed, but will force the fields in the printed (or saved) copy to be blank.

Hi @MediaTek Inc.22143206voz7,

Thank you for your question, and I appreciate the clarity in your explanation.

You’re correct — marking form fields as “Required” in Acrobat ensures validation only when the form is submitted using a button that triggers a submit action (like SubmitForm() or a custom JavaScript check). Unfortunately, simply clicking “Save” or closing the file won’t trigger a warning, even if required fields are empty. This behavior is expected and consistent with Acrobat’s current design.

Additionally, third-party PDF viewers or browsers may not fully support these form behaviors, especially custom JavaScript or validation logic. For the most consistent experience, we recommend instructing users to open the form using Adobe Acrobat or Adobe Reader.

To actively notify users if they skip required fields, you can:

1. Add a custom Submit button to your form.

2. Attach a JavaScript validation script that checks required fields before allowing submission.

Here’s a simple example you can adapt: