Use previous value of "A"

Hi JR, do you want the value of A saved permanently in the PDF, or just for the current session?

The easiest and most straight forward solution is to use a custom document property

Like this

function goThere(newA) {

    this.prevA = newA;

    this.pageNum = newA;

}

Now A is saved in a document level property.

If you want it saved permanently, then use a hidden field.

Cheers,

Thank you both but it does not meet my needs, I will try to explain myself better.

In fact there are 2 functions :

function goThere(A) {

this.pageNum = A;

}

//

function goBack() {

this.pageNum = B;

}

Where B is the previous value of A, not the latest value. Otherwise it will goBack on the current page.

Another approach is to use a closure, which avoids the problem of a global variable like TSN suggested from being changed by code elsewhere. This subject can be a bit complicated, but there are plenty of tutorials out there, such as: JavaScript Function Closures

You can save a value in a variable but (a) don't use "var" and (b) define it OUTSIDE your function first.

Info about variable scope in JavaScript: Demystifying JavaScript Variable Scope and Hoisting

mySavedVariable = -99999999 ;

function myStuff(A)

{

  // do things

  if ( A != mySavedVariable ) { // do things if A is different from last time

  }

  mySavedVariable = A ; // save A for next time

}