Control the Extent of Scrolling in a Scroll Bar

The following example demonstrates the LargeChange and SmallChange properties when used with a stand-alone ScrollBar. The user can set the LargeChange and SmallChange values to any integer in the range of 0 to 100. This example also uses the TextBox.MaxLength property to restrict the number of characters entered in the TextBox controls for the LargeChange and SmallChange values.

To use this example, copy this sample code to the Script Editor of a form. To run the code you need to open the form so the Open event will activate. Make sure that the form contains:

• A Label named Label1

• A TextBox named TextBox1 that is bound to the custom number field named ScrollBarSmallChange

• A Label named Label2

• A TextBox named TextBox2 that is bound to the custom number field named ScrollBarLargeChange.

• A ScrollBar named ScrollBar1 that is bound to the custom number field named ScrollBarValue.

• A Label named Label3.

Sub Item_Open() 
 Set Label1 = Item.GetInspector.ModifiedFormPages("P.2").Controls("Label1") 
 Set ScrollBar1 = Item.GetInspector.ModifiedFormPages("P.2").Controls("ScrollBar1") 
 Set TextBox1 = Item.GetInspector.ModifiedFormPages("P.2").Controls("TextBox1") 
 Set Label2 = Item.GetInspector.ModifiedFormPages("P.2").Controls("Label2") 
 Set TextBox2 = Item.GetInspector.ModifiedFormPages("P.2").Controls("TextBox2") 
 Set Label3 = Item.GetInspector.ModifiedFormPages("P.2").Controls("Label3") 
 
 ScrollBar1.Min = -1000 
 ScrollBar1.Max = 1000 
 
 Label1.Caption = "SmallChange 0 to 100" 
 ScrollBar1.SmallChange = 1 
 TextBox1.Text = ScrollBar1.SmallChange 
 TextBox1.MaxLength = 3 
 
 Label2.Caption = "LargeChange 0 to 100" 
 ScrollBar1.LargeChange = 100 
 TextBox2.Text = ScrollBar1.LargeChange 
 TextBox2.MaxLength = 3 
 
 ScrollBar1.Value = 0 
 Label3.Caption = ScrollBar1.Value 
End Sub 
 
Sub Item_CustomPropertyChange(byval pname) 
 Set ScrollBar1 = Item.GetInspector.ModifiedFormPages("P.2").Controls("ScrollBar1") 
 Set TextBox1 = Item.GetInspector.ModifiedFormPages("P.2").Controls("TextBox1") 
 Set TextBox2 = Item.GetInspector.ModifiedFormPages("P.2").Controls("TextBox2") 
 Set Label3 = Item.GetInspector.ModifiedFormPages("P.2").Controls("Label3") 
 
 If pname = "ScrollBarMin" Then 
 
 If IsNumeric(TextBox1.Text) Then 
 TempNum = CInt(TextBox1.Text) 
 If TempNum >= 0 And TempNum <= 100 Then 
 ScrollBar1.SmallChange = TempNum 
 Else 
 TextBox1.Text = ScrollBar1.SmallChange 
 End If 
 Else 
 TextBox1.Text = ScrollBar1.SmallChange 
 End If 
 
 ElseIf pname = "ScrollBarMax" Then 
 
 If IsNumeric(TextBox2.Text) Then 
 TempNum = CInt(TextBox2.Text) 
 If TempNum >= 0 And TempNum <= 100 Then 
 ScrollBar1.LargeChange = TempNum 
 Else 
 TextBox2.Text = ScrollBar1.LargeChange 
 End If 
 Else 
 TextBox2.Text = ScrollBar1.LargeChange 
 End If 
 
 ElseIf pname = "ScrollBarValue" Then 
 
 Label3.Caption = ScrollBar1.Value 
 End If 
End Sub

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