Complicated Excel form needs to be converted to PDF Fillable form

Question

I have an Excel file have has hidden cheater fields (M&N) and a hidden lookup table (O:P).
The form fields that are used follow (using row 10 as an example, rows 10-25 are involved)
E10 = Lengthft (entry field)
F10 = Widthft (entry field)
G10 = Patchsy (formula)=ROUND(IF(F10="",0,(E10*F10)/9),3)
H10 = PlanPatchThicknessin (entry field)
I10 = MeasuredPavementThicknessin (entry field)
J10 = Adjustedsy (formula)=IF(F10="",0,IF(N10="Extra Work","Extra Work",G10*(N10/100)+G10))
M10 = hidden field (formula)=((I10-H10)/H10)*100
N10 = hidden field (formula)=VLOOKUP(M10,O1:P7,2)
Hidden Lookup (O1:P7):
-99
-20
-30.0001
-15
-20.0001
-10
-10.0001
10.0001
10
20.0001
15
30.0001
Extra Work
I know very little about java script and have been learning as I go.  I have created some custom calculation fields but this is way over my head.  I have converted the pdf to a form and added the fields, I have already added calculations for Patchsy and ToDatesy (not shown in list of fields).
I am completely lost in how to proceed with the Adjustedsy field because it is using all these hidden fields to obtain the answer.
I hope someone can help me.
Thanks

Answer 1

I have tried to write this out as a problem and not sure if it makes sense to anyone but me.  This is all used to fill one field (AdjustedSYRow1).  The last part of the problem is written as an if statement.  Not sure how else to write it out.
I understand the variable part and can write the first part of the problem - then I get to the lookup and don't know how to do that.
// Get field value
var v1 = getField("MeasuredRow1").value;
// Get field value
var v2 = getField("PlanRow1").value;
if (v1==0) event.value = "";
else event.value = (v1 - v2)/v2*100;
That will answer the first part of the problem, but then I get hung up on the rest of it.
First part of the problem:
((Measured Pavement Thickness - Plan Patch Thickness) / Plan Patch Thickness ) * 100
Example with form field names:  ((MeasuredRow1 – PlanRow1) / PlanRow1) * 100
This is where I get stuck:
If the answer to the above is…
< -30 then -20,
between -20.0001 and -30, then -15,
between -10.0001 and -20  then -10,
between -10 and 10, returns null(?), a period was used in the excel lookup because a zero would not work – but it means that there is no adjustment.
between 10.0001 and 20  then 10,
between 20.0001 and 30  then 15,
over 30 then “Extra Work”)
The above information (in bold) is then used to complete the rest of the problem. 
=IF(F10="",0,IF(N10="Extra Work","Extra Work",G10*(N10/100)+G10))
Example with form field names:  If WidthftRow1=””,0,if(above answer is “Extra Work”, “Extra Work”, PatchRow1*(above answer/100)+PatchRow1