I tested Your solution but I’ve a onfocus trigger

<smart-numeric-text-box id=”e53796681″ input-format=”integer” class=”elemento_testo_valore” value=”0″ name=”e53796681″ required=”” onchange=”mostraAlertMsgOption(this)” onfocus=”on_focus(this)”>

and this seems to inhibit the solution You proposed.

How can I solve it ?

Tks