Real-time field calculation

[sumservis]

Hi, I would like the result of several possible fields with TAX. Only one field will be filled in at a time ... So it will be the result based ... Example: skutenPjem * 1.21 or skutenNklady * 1.21 I always have to reckon with the fact that the user selects a field, and I will have to add 21% to it thank you for your help

My code:

 "vypocitejdph": {
"type": "currency",
"notStorable": true,
"readOnly": true,
"select": {
"select": "MUL:((plnovanPjem,skutenPjem,skutenNklady,plnovanNklady), (dPH/100))"
}
}, 

[esforim]

I'm guessing you want it to Calculate before you press "Update/Save"? I think only the Invoice/Quote system can do 'live' calculation. You can have a look at that to see how they did it. Unfortunately it is a paid extensions.