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我們想用一個默認值填充一個DropDownList,當用戶從一個ASP.Net DetailsView進入「添加」模式時從一個變量中獲得一個默認值VB.Net代碼隱藏文件。你能告訴我如何讓它填充?在進入添加模式時填充ASP.Net DetailsView DropDownList和默認值
這是我們要填充爲DropDownList標記:
<asp:TemplateField HeaderText="Class:" SortExpression="ClassID">
<EditItemTemplate>
<asp:DropDownList
ID="DropDownListClass"
Runat="server"
DataSourceID="SqlDataSourceClasses"
DataTextField = "ClassName"
DataValueField="ID"
SelectedValue='<%# Bind("ClassID") %>'
ForeColor="Blue">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidatorEditClass" runat="server" ControlToValidate="DropDownListClass"
ErrorMessage="Please select a Class here." Font-Bold="True" Font-Italic="True" ForeColor="Red"
SetFocusOnError="True" Display="Dynamic">
</asp:RequiredFieldValidator>
</EditItemTemplate>
<InsertItemTemplate>
<asp:DropDownList
ID="DropDownListClass"
Runat="server"
DataSourceID="SqlDataSourceClasses"
DataTextField = "ClassName"
DataValueField="ID"
SelectedValue='<%# Bind("ClassID") %>'
ForeColor="Blue">
</asp:DropDownList>
<asp:RequiredFieldValidator ID="RequiredFieldValidatorInsertClass" runat="server" ControlToValidate="DropDownListClass"
ErrorMessage="Please select a Class here." Font-Bold="True" Font-Italic="True" ForeColor="Red"
SetFocusOnError="True" Display="Dynamic">
</asp:RequiredFieldValidator>
</InsertItemTemplate>
<ItemTemplate>
<asp:DropDownList
ID="DropDownListClass"
Runat="server"
DataSourceID="SqlDataSourceClasses"
DataTextField = "ClassName"
DataValueField="ID"
SelectedValue='<%# Bind("ClassID") %>'
Enabled="false"
ForeColor="Blue"
Font-Bold="true">
</asp:DropDownList>
</ItemTemplate>
</asp:TemplateField>
我們在代碼隱藏文件中使用它來填充將包含默認值的變量:
Function GetValueFromDropDownListClassItem() As String
Dim strValueToReturn As String
Dim drpValue As DropDownList
drpValue = DetailsView.FindControl("DropDownListClass")
If String.IsNullOrEmpty(drpValue.Text) Then
strValueToReturn = ""
Else
strValueToReturn = drpValue.SelectedItem.Text
End If
Return strValueToReturn
End Function
我們只是想使用這個值,並使用此變量的值預先選擇DropDownList。
備註:您可以添加此只是爲了InsertTemplate –
感謝您的答覆,但我們正在尋找不添加新值,而是選擇從包含要選擇的值的變量中獲取的DropDownList中的現有值。 –
就像我發佈在我的編輯? –