I have build a simple calculator which calculates some plastic specifications called MFI (each has got min and max, compare the screenshot). There are 3 different types of MFI (Melt flow index) MFI 2, MFI 5 and MFI 21 / HLMI. I have got all the functions to calculate each of these types, if you have got one of them given.

The aim: If you type in a  value in one of the fields, all the other fields should be calculated automatically. So far so good.

The problem: If you change one of the values, the system do not recalculate the other values. I just build a "reset" button to solve the problem. Does anybody has a nicer approach? 

All the calculation are in the specific on user input area of each field. I.E.: MFI 2 min:

2. if (input.calc  =  "Berechnen")
3. {
4.     if (input.MFI_5_min  =  null) // this prevent the infinite loop
5.     {
6.         input.MFI_5_min = (input.MFI_min  *  4.5);
7.     }
8.     if (input.HLMI_bis  =  null)
9.     {
10.         input.HLMI_bis = (input.MFI_min  *  100);
11.     }
12. }

The calc field with " berechnen " is for the reset button:

2. if (input.Reset1  =  "Reset")
3. {
4.     calc.deselect("Berechnen");
5.     input.MFI_min = null;
6.     input.MFI_max = null;
7.     input.MFI_5_min = null;
8.     input.MFI_5_max = null;
9.     input.HLMI_bis = null;
10.     input.HLMI_max = null;
11. }
12. if ((input.HLMI_bis  =  null)  ||  (input.HLMI_max  =  null)) // this is just to check if the reset is done
13. {
14.     input.calc = "Berechnen";
15.     Reset1.deselect("Reset");
16. }

My approach: I have to indicate if you type in a new value in one of the fields, and then the others should be 1. reseted and 2. recalculated.

Has anybody an approach how to implement this into zoho?

THANKS!