ComboBox 对象 (Access)（二）

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时　间:2022-07-16 08:45:05
作　者:杨雪 ID：42182 城市：南京
摘　要:以下示例演示在加载窗体时如何设置组合框的“RowSource”属性。
正　文:

以下示例演示在加载窗体时如何设置组合框的“RowSource”属性。当显示该窗体时，存储在“tblDepartment”组合框的“Department”字段中的项目将显示在“cboDept”组合框中。

Private Sub Form_Load()
    Me.Caption = "Today is " & Format$(Date, "dddd mmm-d-yyyy")
    Me.RecordSource = "tblDepartments"
    DoCmd.Maximize  
    txtDept.ControlSource = "Department"
    cmdClose.Caption = "&Close"
    cboDept.RowSourceType = "Table/Query"
    cboDept.RowSource = "Select Department FROM tblDepartments"
End Sub

下面的示例演示如何创建在显示另一列时绑定到一列的组合框。将“ColumnCount”属性设置为 2 可指定“cboDept”组合框将显示由“RowSource”属性指定的数据源的前两列。将“BoundColumn”属性设置为 1 可指定在检查组合框的值时将会返回存储在第一列中的值。

ColumnWidths 属性指定两列的宽度。通过将第一列的宽度设置为 0in.，可以在组合框中不显示第一列。

Private Sub cboDept_Enter()
    With cboDept
        .RowSource = "Select * FROM tblDepartments orDER BY Department"
        .ColumnCount = 2
        .BoundColumn = 1
        .ColumnWidths = "0in.;1in."
    End With
End Sub

以下示例演示如何将项目添加到绑定的组合框。

Private Sub cboMainCategory_NotInList(NewData As String, Response As Integer)

    On Error GoTo Error_Handler
    Dim intAnswer As Integer
    intAnswer = MsgBox("""" & NewData & """ is not an approved category. " & vbcrlf _
        & "Do you want to add it now?", vbYesNo + vbQuestion, "Invalid Category")

    Select Case intAnswer
        Case vbYes
            DoCmd.SetWarnings False
            DoCmd.RunSQL "Insert INTO tlkpCategoryNotInList (Category) " & _ 
                         "Select """ & NewData & """;"
            DoCmd.SetWarnings True
            Response = acDataErrAdded
        Case vbNo
            MsgBox "Please select an item from the list.", _
                vbExclamation + vbOKOnly, "Invalid Entry"
            Response = acDataErrContinue

    End Select

    Exit_Procedure:
        DoCmd.SetWarnings True
        Exit Sub

    Error_Handler:
        MsgBox Err.Number & ", " & Err.Description
        Resume Exit_Procedure
        Resume

End Sub

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