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Webform hook field text element

I Use Drupal 8.8 with Webform 8.x, in a simple webform with a select list element and a text field element, I need to update a text field element with values resulting from database queries when the user chooses an option from the listbox.

I would like to accomplish this with a PHP code in a custom mymodule. How can I intercept the user’s action when selecting a value from the select list?

Besides intercepting the event I also need to know the content of the choice that the user has made on the select list.

How can it be done? Can anyone give me an example?

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Webform hook field text element

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