ComboBox.Dirty Event (Access)
The Dirty event occurs when the contents of the specified control changes.
Syntax
expression .Dirty(Cancel, )
expression A variable that represents a ComboBox object.
Parameters
Name |
Required/Optional |
Data Type |
Description |
|---|---|---|---|
Cancel |
Required |
Integer |
The setting determines if the Dirty event occurs. Setting the Cancel argument to True (–1) cancels the Dirty event. |
Remarks
Examples of this event include entering a character directly in the text box or combo box or changing the control's Text property setting by using a macro or Visual Basic.
Modifying a record within a form by using a macro or Visual Basic doesn't trigger this event. You must type the data directly into the record or set the control's Text property.
This event applies only to bound forms, not an unbound form or report.
To run a macro or event procedure when this event occurs, set the OnDirty property to the name of the macro or to [Event Procedure].
By running a macro or event procedure when a Dirty event occurs, you can determine if the record can be changed. You can also display a message and ask for edit permission.
Changing the data in a record by using the keyboard causes keyboard events to occur in addition to control events like the Dirty event. For example, if you move to a new record and type an ANSI character in a text box in the record, the following events occur in this order:
KeyDown > KeyPress > BeforeInsert > Dirty > KeyUp
The BeforeUpdate and AfterUpdate events for a record occur after you have entered the new or changed data in the record and moved to another record (or clicked Save Record on the Records menu), and therefore after the Dirty event for the record.
Canceling the Dirty event will cause the changes to the current record to be rolled back. It is equivalent to pressing the ESC key.
Example
The following example enables the btnUndo button when data is changed. The UndoEdits( ) subroutine is called from the Dirty event of text box controls. Clicking the enabled btnUndo button restores the original value of the control by using the OldValue property.
Private Sub Form_Dirty()
If Me.Dirty Then
Me!btnUndo.Enabled = True ' Enable button.
Else
Me!btnUndo.Enabled = False ' Disable button.
End If
End Sub
Sub btnUndo_Click()
Dim ctlC As Control
' For each control.
For Each ctlC in Me.Controls
If ctlC.ControlType = acTextBox Then
' Restore Old Value.
ctlC.Value = ctlC.OldValue
End If
Next ctlC
End Sub