<apex:page lightningStylesheets="true" standardController="Acquisto__c" extensions="CassaInputFieldCnt" docType="html-5.0">
<script type="text/javascript" src="http://ajax.googaleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
function aggiornaQnt(val,id){
console.log(val);
console.log(id);
}
$("#qnt").bind('keyup mouseup', function () {
console.log("changed");
});
</script>
<apex:inputText html-min="1" html-type="number" value="{!qnt}" onclick="aggiornaQnt(this.value,'{!sa.id}');" style="width:80px!important;" />