Increment multiple numeric fields

i'm brand new adobe xi pro , i'm modifying existing document received colleague.  i'm trying is:

 

i have 7 number fields named f1 .. f2.

i want enter number in 1 of these 7 fields , fields after field integer entered each increment entered value 1

e.g. user enters 1 f4,

f5 = f4 + 1,

f6 = f5 + 1,

f7 = f6 + 1

 

any suggestions on how achieve appreciated.  thanks.

you wrote f1-f2, assume mean f1-f7...

you can apply function doc-level script , call custom validation event of each of fields:

 

 function incrementfollowingfields() {     if (event.value=="") return;     var fieldnumber = number(event.target.name.replace("f",""));     var counter = 1;     (var i=fieldnumber+1; i<=7; i++) {         this.getfield("f"+i).value = (number(event.value))+counter;         counter++;     } } 

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