Disable further input until all previous required fields are filled

1. How do you disable submit button until required fields are filled?
2. How to disable a button in html based on condition?

How do you disable submit button until required 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.

How to disable a button in html based on condition?

By default a button's state is enabled in HTML so by setting disabled = true, we have disabled the button for the user. 3. Then we add an event handler (addEventListener) to the input field with the event property change which monitors the interaction with elements.