在隐藏/取消隐藏标题文本方面需要帮助 [英] Need help with hide/unhide Headertext

问题描述

我有一个带有标题文本列表的DetailsView. PERM CODE标题文本是隐藏的，并且仅在选择的DROPDOWN选项为DETAIL时才显示.

这是我的aspx和vb代码，后面的代码不起作用.
ASPX代码:

I have a DetailsView with a list of Headertext. The PERM CODE headertext is hidden and will only be displayed when the DROPDOWN option choosen is DETAIL.

Here is my aspx and vb code behind which is not working.
ASPX code:

<asp:TemplateField HeaderText = "DATAITEM:">
    <itemtemplate>
      <asp:Label ID="LblDataItem" runat="server" 

               Text= '<%# eval("dataitem") %>' />
    </itemtemplate>
    <edititemtemplate>
       <asp:DropDownList ID="DDLDataItemnew" runat="server"

          AutoPostBack ="true"

         OnSelectedIndexChanged = "DDLDataItemnew_selectedindexchanged"

        >
         <asp:ListItem>Choose One
         <asp:ListItem>DETAIL
         <asp:ListItem>SUMMARY
         <asp:ListItem>CUSTOM         
       </edititemtemplate>
<asp:TemplateField HeaderText = "PERM CODE:" Visible="false" >
    <edititemtemplate>
        <asp:DropDownList ID="DDLPermCode" runat="server"  />
        </edititemtemplate>

后面的VB代码

VB code behind

Protected Sub DDLDataItemnew_selectedindexchanged(ByVal sender As Object, ByVal e As EventArgs)
    Dim tmp_dataitem As DropDownList = DirectCast(DTLVwAddeduser.FindControl("DDLDataItemnew"), DropDownList)
        Dim dataitem As String = Trim(tmp_dataitem.Text)
        If dataitem = "DETAIL" Then
            If DTLVwAddeduser.CurrentMode = DetailsViewMode.Edit Then
                //get the index of the DATAITEM headertext
                Dim i As Integer = GetIndex("DATAITEM:",DTLVwAddeduser) 
                DTLVwAddeduser.Fields(i).Visible = True
            End If
        End If
End Sub

推荐答案

试试这个

Dim dataitem As String = Trim(tmp_dataitem.SelectedItem.Value)

代替
Dim dataitem As String = Trim(tmp_dataitem.Text)

Hi,

Try this

Dim dataitem As String = Trim(tmp_dataitem.SelectedItem.Value)

Instead of
Dim dataitem As String = Trim(tmp_dataitem.Text)

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