Submit button permanently disabled or invisible?

1. Should I hide or disable button UX?
2. Should a disabled button be clickable?
3. How do I disable and enable submit button?
4. How do I disable the submit button until all fields are filled?

Should I hide or disable button UX?

If you hide the button the user may feel confused and lost but would remove unnecessary elements from the screen, if you disable the button the user is aware of possible actions and maintains control of the user. The best way to resolve this issue is to do a user test. There is another post about it here.

Should a disabled button be clickable?

A disabled button is unusable and un-clickable. The disabled attribute can be set to keep a user from clicking on the button until some other condition has been met (like selecting a checkbox, etc.).

How do I disable and enable submit button?

To disable a submit button, you just need to add a disabled attribute to the submit button. $("#btnSubmit"). attr("disabled", true); 1.2 To enable a disabled button, set the disabled attribute to false, or remove the disabled attribute.

How do I disable the submit button until all fields are filled?

Just click f12 in your browser, find the submit button in the html, and then remove the disabled ! It will submit the form even if the inputs are empty.