Replace "#form1"
and "form_field_be63"
with your actual values. This code should immediately replace any commas entered with dots… probably.
$w.onReady(function () {
$w("#form1").onFieldValueChange(() => {
const fieldValues = $w("#form1").getFieldValues();
fieldValues["form_field_be63"] = fieldValues["form_field_be63"].replace(/,/g, ".");
$w("#form1").setFieldValues(fieldValues);
});
})