Hide and show button at the top or at the end of the form

Question

Hi,
I have the form that has 2 buttons, move up and move down, which is used to move the subform up or down. I currently have it to pop up a message: "The current item can't be moved up" when the user try to move that item up since they are already at the top of the form
or "The current item can't be moved down" since they are already at the bottom of the form.
Now I'd like to have one to be hidden depend on where on the current location instead of the pop up message.
Can any one please advise.
Thanks in advance,
Han Dao

Answer 1

Hi Naill,
Here is the code that I try to place in the layout:ready event but it does not seem to work. Can you please take a look at it.
==============The Code=============
form1990.Questions.MoveSub.up::ready:layout - (JavaScript, client)
//Move Up
if (xfa.resolveNode("form1990.Questions").index != 0) {
  var nIndexFrom = xfa.resolveNode("form1990.Questions").index;
  var nIndexTo = xfa.resolveNode("form1990.Questions").index - 1;
  _Questions.moveInstance(nIndexFrom, nIndexTo);
  xfa.form.recalculate(true);
} else {
// set the button to hide at the top of the form.
  xfa.resolveNode("form1990.Questions.MoveSub.up").presence = "hidden";
form1990.Questions.MoveSub.down::ready:layout - (JavaScript, client)
//Move Down
var nIndex = form1990.Questions.index;
if ((nIndex + 1) < _form1990.Questions.count)
var nIndexFrom = nIndex;
var nIndexTo = nIndex + 1;
_form1990.Questions.moveInstance(nIndexFrom, nIndexTo);
xfa.form.recalculate(true);
else
  xfa.resolveNode("form1990.Questions.MoveSub.down").presence = "invisible";
===========End ========
Thanks,
Han Dao