Subtraction javascript

[Jordan27718208hgs0]

I am currently using the below formula for subtraction. However, if "FieldB.0" is empty, I do not want the script to run. When ever "FieldA.0" is filled in, it is still returning the value. I know I need to use an "if" in the script but I do not know how to do that.

var v1 = getField("FieldA.0").value;

var v2 = getField("FieldB.0").value;

event.value=v1-v2;

[try67 · Accepted solution]

Use this:

var v1 = getField("FieldA.0").valueAsString;
var v2 = getField("FieldB.0").valueAsString;

if (v1=="" || v2=="") event.value = "";
else event.value=Number(v1)-Number(v2);

[Jordan27718208hgs0]

Perfect, thank you.

[Fazal25101036kxl2]

Hi it just worked Fine, but there is a problem, i want the subtraction as if Field1 - Field2 = Ans, but i want to add +1 in Answer if the value is given, and if the value is not given then answer must be zero plz guide me. for example 401 - 500 = 100 (Answer should be this) but if the fields are empty then answer must be the zero. picture is attached. 

[try67]

Change the last two lines to:

if (v1=="" || v2=="") event.value = 0;
else event.value=(Number(v1)-Number(v2))+1;

[Fazal25101036kxl2]

I have applied the following formula but i want that if the given data is zero then the result in total shall also be zero (0) Rest of the things are okay.

Here is the formula which i applied:

var v1 = getField("field2.0").valueAsString; var v2 = getField("field1.0").valueAsString; if (v1=="" || v2=="") event.value = 0; else event.value=(Number(v1)-Number(v2))+1;

[try67]

Change the third line to:

if (v1=="" || v2=="" || (v1+v2)==0) event.value = 0;

[Fazal25101036kxl2]

Thank u so much God bless u, Thanks alot .