Best way to have form submit disabled until file selected

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Apr 10, 2022, 6:10:27 PM4/10/22

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Hello i have a form with a file to upload.

What is the best web2py way to have the submit button disabled until the user selects a file to upload?

Regards

António

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Apr 11, 2022, 3:58:45 AM4/11/22

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I'd say javascript, since the "required" validator only works after the form is submitted.