DotNetFactory interface functions (5) – Create ComboBox

Posted by Albert Gareev on Jun 16, 2009 | Categories: DotNetClassesSource code

Parent page: Service Functions – DotNetFactory (QTP, VBScript)

Creating .NET objects from VBScript/QTP

You can create a ComboBox (Dropdown Listbox/InputBox Object) and assign required properties within one line by calling the function below. The function has one mandatory parameter (list of available selection items – packed in the Dictionary object) and a set of optional parameters provided in the Dictionary object.

Mandatory parameters through Dictionary object: “Key – Value” pairs. Keys are used to retrieve the Values only. Values will form the contents of the dropdown.

Currently supported optional parameters:

ComboBox Width and Height.

ComboBox – Left, Top.

  • p.text – Prompt text displayed by default in the input area.
  • p.index – Zero-based index of the item to be selected by default.
  • p.item – Exact string of the existing item to be selected by default.

Note. You may code as many optional parameters as required. Just follow the established syntax and keep in mind that parameter index for Dictionary must be unique – otherwise it will overwrite the previous parameter.


For the complete .NET ComboBox Class reference please visit:

 If you want to have ComboBox editable as TextBox you need to implement a more comprehensive code covering settings for  .DropDownStyle property.

Used resources

Service Functions – String (QTP, VBScript)

Implementing optional and default parameters

Create ComboBox 

 Public Function CreateComboBox(ByVal objItems, ByVal objParameter)
    Dim sText, intWidth, intHeight, intMaxLength
    Dim intLeft, intTop
    Dim objComboBox, objComboBoxStyle
    Dim Iter, dvKeys, sItem, intIndex

  'Verify parameters
  If TypeName (objParameter) <>  "Dictionary" Then
   Set objParameter = CreateObject("Scripting.Dictionary")
  End If

  sText = objParameter.Item("p.text")
  intWidth = InitLong(objParameter.Item("p.width"), 100)
  intHeight = InitLong(objParameter.Item("p.height"), 20)
  intLeft = IntVal(objParameter.Item("p.left"))
  intTop = IntVal(objParameter.Item(""))
  intMaxLength = InitLong(objParameter.Item("p.length"), 255)
  Set objComboBoxStyle = DotNetFactory.CreateInstance("System.Windows.Forms.ComboBoxStyle", "System.Windows.Forms")
  Set objComboBox = DotNetFactory.CreateInstance("System.Windows.Forms.ComboBox", "System.Windows.Forms")

  objComboBox.Text = sText
  objComboBox.Width = intWidth
  objComboBox.Height = intHeight
  objComboBox.Left = intLeft
  objComboBox.Top = intTop
  objComboBox.MaxLength = intMaxLength

  objComboBox.DropDownStyle = objComboBoxStyle.DropDownList
  Set objComboBoxStyle = Nothing

  If TypeName (objItems) <>  "Dictionary" Then
   Set CreateComboBox = objComboBox
   Exit Function
  End If

  dvKeys = objItems.Keys()

  For Iter = 0 To UBound(dvKeys)
   sItem = objItems.Item(dvKeys(Iter))
   If sItem <> "" Then
   End If

  If objParameter.Exists("p.index") Then
   intIndex = IntVal(objParameter.Item("p.index"))
   If intIndex <= UBound(dvKeys) Then
    objComboBox.SelectedIndex =  intIndex
   End If
  End If

  If objParameter.Exists("p.item") Then
   sItem = objParameter.Item("p.item")
   intIndex = objComboBox.FindStringExact(sItem)
   If intIndex <> - 1 Then
    objComboBox.SelectedIndex =  CInt(intIndex)
   End If
  End If
  Set CreateComboBox = objComboBox
 End Function


Set objLst = CreateComboBox(AssociateParameters("1 = Option 1, 2 = Option 2"), AssociateParameters("p.index = 0"))

Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
This work by Albert Gareev is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported.