Question How do I use a decimal point in Javescript calculations?

[RLGL]

Let me start by stating I know NOTHING about programming or what I am trying to do.
The editor I am using is Foxit Phantom PDF.
I am trying to utilize Javescript in a PDF form to perform simple calculations, dollars and cents. When adding all is good. Subtracting is another story, the result is a number with 14 positions after the decimal point. How do I restrict the result to 2 decimal points? The image is what I am using to create the calculations.

 

[purbeast0]

A quick google search.

Just run this when you are displaying it.

https://www.w3schools.com/jsref/jsref_tofixed.asp

 

[RLGL]

A quick google search.

Just run this when you are displaying it.

https://www.w3schools.com/jsref/jsref_tofixed.asp

inserting the string :
var num = 5.56789;
var n = num.toFixed(2);
fill_0-Internal
results in:
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

======== Field : calculate ========
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

How do I fix it?

All the methods found by searching result in some sort of error.

 

[mxnerd]

Join

http://forums.foxitsoftware.com/

 

[MagnusTheBrewer]

inserting the string :
var num = 5.56789;
var n = num.toFixed(2);
fill_0-Internal
results in:
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

======== Field : calculate ========
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

How do I fix it?

All the methods found by searching result in some sort of error.

You don't have to worry about decimal places until it's displayed.

 

[purbeast0]

inserting the string :
var num = 5.56789;
var n = num.toFixed(2);
fill_0-Internal
results in:
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

======== Field : calculate ========
[ Line: 00003 { TypeError } ] : Cannot read property 'value' of null

How do I fix it?

All the methods found by searching result in some sort of error.

I'm not sure why your fill_0-Internal function is throwing an erro.

You asked about setting precision in numbers which is what the solution I posted is for.

 

[Ken g6]

If you need to keep it a number, you can try rounding.

But it's hard to know how much of ECMAScript that PDF software actually supports.

 

[mxnerd]

http://forums.foxitsoftware.com/for...for-javascript-as-implemented-by-foxit-phatom

== Edit ==

This probably can help.

https://acrobatusers.com/tutorials/print/how-to-do-not-so-simple-form-calculations

 

[RLGL]

Thanks for the input, I found another section of options that allowed the control of the decimal places.