帶DropDownList的EditItemTemplate-onselectedindexchanged

Question

在我的EditTemplate中，我有一個DropDownList這樣的：

<EditItemTemplate>                      
    <asp:DropDownList ID="ddlFixture" runat="server"   AutoPostBack="True"   onselectedindexchanged="fixtureSelected"
           DataSourceID="FixtureDataSource"  DataTextField="WTag" DataValueField="WTag" AppendDataBoundItems="true" SelectedValue='<%#Bind("Fixure") %>'>
    </asp:DropDownList>                                                         
</EditItemTemplate>

當用戶從DropDownList中選擇一個項目時，我也想填充EditMode中的其他字段。

您會注意到，在onselectedindexchanged =“ fixtureSelected”上，我正在調用fixtureSelected。 我注意到了我面臨的一些問題：

protected void fixtureSelected(object sender, EventArgs e)
{
     // Below I am trying to get value of ddlFixture but it cannot recognize ddlFixture. GettingThe name 'ddlFixture' does not exist in the current context

     string fixtureId = ddlFixture.SelectedItem.Value;

    // I also need to update the text in EditMode but this will not work either. Get similar message as for ddlFixture 

    txtCampus.Text = "Campus1";             
}

Answer 1

您的問題是由於您試圖訪問的控件位於GridView的edititemtemplate中。

要進入dropdownlist實例，可以使用：

DropDownList ddlFixture = sender as DropDownList;

並在edititemtemplate中獲取其他控件，請使用：

ddlFixture.NamingContainer.FindControl("control_id")

例如：

TextBox txtCampus = ddlFixture.NamingContainer.FindControl("txtCampus") as TextBox;