Custom Calculation script not working in a fillable form - suggestions please

[expogal]

I have entered the script to the right to the field highlighted in blue on the left...when I populate the unit size field, nothing shows up in the rate field.  I keep staring and do not understand my mistake.  Thank you - K

[Thom Parker]

If this calculation script is entered into the "RateRow1" field then it cannot reference it self as is done in this code this.getField("RateRow1").  

You say you enter a value into the Unit size field, but this field is not being referenced in the script. I think you must mean to use this code in the script. 

this.getField("Unit Size")

[expogal]

That is wonderful!  I modified my code to reflect and it worked!  So, if I may, I would also like the duplicate field "unit size on the second row to only populate if there is something in the field "extra row 1" is that possible too?  I am new to all of this and appreciate the assistance.

[expogal]

ok - i jumped the gun...this did not resolve my issue.  It populated once.  when I went to change the unit size it did not update the amount and when i deleted the value it did not clear the calculated field...

[Thom Parker]

That is because of the next error in the code. 

See this article:

https://www.pdfscripting.com/public/How-to-write-an-If-statement.cfm

The answer is in the 2nd code example.