Adobe Acrobat

I'm not sure if I understand everything. I created an example with a button add and remove for every row in the table. There is also a number column. The numbers will change automaticly when inserting or deleting a row.
Very important is to remerge the Form-DOM.

[b]Add Button:[/b]
var lfdNr = this.parent.parent.index + 1;
var zwWert = new Number(0);
var iManager = this.parent.parent.instanceManager;

//insert new row behind last position
iManager.addInstance(1);
//if the new row is at the end of table, you do not need to move it
if (iManager.count-1 != lfdNr)
//move the inserted row under the pushed button
iManager.moveInstance(iManager.count-1, lfdNr);

//renumber
for (lfdNr = iManager.count-1; lfdNr > this.parent.parent.index; lfdNr--)
{
zwWert = lfdNr + 1;
xfa.form.form1.P1.Sub_Dyn.tab.resolveNode("Row["+lfdNr+"]").No.rawValue
= zwWert.toString();
}

//Update Form-DOM
xfa.form.remerge();

[b]Remove Button:[/b]
var pos = this.parent.parent.index;
var zwWert = new Number(0);
var iManager = this.parent.parent.instanceManager;

//if there are more rows than the minimal count of them
if (iManager.count > this.parent.parent.occur.min)
{
//delete row
iManager.removeInstance(pos);

//renumber rows
for (var lfdNr = iManager.count-1; lfdNr >= pos; lfdNr--)
{
zwWert = lfdNr + 1;
xfa.form.form1.P1.Sub_Dyn.tab.resolveNode("Row["+lfdNr+"]").No.rawValue = zwWert.toString();
}

//Update Form-DOM
xfa.form.remerge();
}

You need to customize the reference of the field xfa.form...

Ciao
Jens

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number of (referring to) instances of a subform trailer