There is an example for the Number-Field Component in Vaadin 14:
https://vaadin.com/components/vaadin-number-field/java-examples/number-field
If i open this page in Firefox, i can type alphanumeric values inside the year-field.
If i open his page with Opera or Chrome, i can only type numeric values into the field.
NumberField uses a <input type="number"> internally and that’s a limitation based on the behavior of the input on Firefox as you can check here (https://jsfiddle.net/mn5erzf8/). There’s an [issue filled for this behavior]
(https://bugzilla.mozilla.org/show_bug.cgi?id=1398528) at their bug tracker, but it’s 3 years old already.
I created [an issue to track this]
(https://github.com/vaadin/vaadin-text-field/issues/458), but I can’t give any estimate of when we will be able to work on it.