How to count subforms and add a value to a dropdown?

Hello!
I want to make a form with a subform that the user can dublicate by clicking a button (JS: ... addInstance(1);)
after he dublicates the subform serval times and entered some text in the fields i wanto to count the subforms and go in every subform to get a value from a field.
Example:
A form with a subform for Firstname and Lastname.
the user dublicates the subform 5 times and filled the fields.
now at the end i want to have a dropdown with all Lastnames from the 5 subforms.
How can i make this? I looked in serval Samples but i dont find an example for it.
Thanks for Help.
Greetings A. Peters

Hello Stefan!
Thanks for your good example. It works really good. But when i opened it in the Designer and saves it under a new Name i get some warnings is that normal?
Here a copy from the log:
Ungültiger Node-Typ: macroCache
Ungültiger Node-Typ: macroCache
PDF-Dokument generieren...
Skript fehlgeschlagen (Sprache ist javascript; Kontext ist xfa[0].form[0].form1[0].Page1Subform[0].TotalSubform[0].NameDropList[0])
Skript=var sCurValue = this.rawValue; // save current value before we clear all the items
var bResetValue = false; // true if sCurValue should remain the list's value
this.clearItems();
for (var i = 0; i < Page1Subform._NameSubform.count; i++)
var oNameSFInstance = Page1Subform.resolveNode("NameSubform[" + i + "]");
if (oNameSFInstance.FirstName.rawValue != null && oNameSFInstance.LastName.rawValue != null)
if (!bResetValue && (sCurValue == oNameSFInstance.LastName.rawValue))
bResetValue = true;
// fields have been filled
this.addItem(oNameSFInstance.FirstName.rawValue, oNameSFInstance.LastName.rawValue); // first name is the text, last name is the value
if (bResetValue)
this.rawValue = sCurValue;
Fehler: Ungültiger Abruf-Vorgang für Eigenschaft; instanceManager hat keine Eigenschaft 'count'
PDF erfolgreich generiert.
Ungültiger Node-Typ: macroCache
PDF-Dokument generieren...
Skript fehlgeschlagen (Sprache ist javascript; Kontext ist xfa[0].form[0].form1[0].Page1Subform[0].TotalSubform[0].NameDropList[0])
Skript=var sCurValue = this.rawValue; // save current value before we clear all the items
var bResetValue = false; // true if sCurValue should remain the list's value
this.clearItems();
for (var i = 0; i < Page1Subform._NameSubform.count; i++)
var oNameSFInstance = Page1Subform.resolveNode("NameSubform[" + i + "]");
if (oNameSFInstance.FirstName.rawValue != null && oNameSFInstance.LastName.rawValue != null)
if (!bResetValue && (sCurValue == oNameSFInstance.LastName.rawValue))
bResetValue = true;
// fields have been filled
this.addItem(oNameSFInstance.FirstName.rawValue, oNameSFInstance.LastName.rawValue); // first name is the text, last name is the value
if (bResetValue)
this.rawValue = sCurValue;
Fehler: Ungültiger Abruf-Vorgang für Eigenschaft; instanceManager hat keine Eigenschaft 'count'
PDF erfolgreich generiert.
Ungültiger Node-Typ: macroCache
PDF-Dokument generieren...
Skript fehlgeschlagen (Sprache ist javascript; Kontext ist xfa[0].form[0].form1[0].Page1Subform[0].TotalSubform[0].NameDropList[0])
Skript=var sCurValue = this.rawValue; // save current value before we clear all the items
var bResetValue = false; // true if sCurValue should remain the list's value
this.clearItems();
for (var i = 0; i < Page1Subform._NameSubform.count; i++)
var oNameSFInstance = Page1Subform.resolveNode("NameSubform[" + i + "]");
if (oNameSFInstance.FirstName.rawValue != null && oNameSFInstance.LastName.rawValue != null)
if (!bResetValue && (sCurValue == oNameSFInstance.LastName.rawValue))
bResetValue = true;
// fields have been filled
this.addItem(oNameSFInstance.FirstName.rawValue, oNameSFInstance.LastName.rawValue); // first name is the text, last name is the value
if (bResetValue)
this.rawValue = sCurValue;
Fehler: Ungültiger Abruf-Vorgang für Eigenschaft; instanceManager hat keine Eigenschaft 'count'
PDF erfolgreich generiert.
7 Warnungen/Fehler gemeldet.

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