【发布时间】：2014-04-02 08:12:03
【问题描述】：
我正在使用用户控制页面 (.ascx)。我有一个中继器，里面有 n 个 DropDownList 和一些文本框。我需要触发 SelectedIndexChanged 事件以从文本框中获取值。
这是我得到的错误： “ddlEye_SelectedIndexChanged”不是“ASP.controls_claims_laborder_ascx”的成员。
HTML：
<asp:Repeater ID="rptProducts" runat="server">
<HeaderTemplate>
<tr class="Header">
<td>Eye</td>
<td>Tarrif</td>
<td>Description</td>
<td>Lab Price</td>
</tr>
</HeaderTemplate>
<ItemTemplate>
<tr>
<td>
<asp:DropDownList ID="ddlEye" runat="server" OnSelectedIndexChanged="ddlEye_SelectedIndexChanged" AutoPostBack="true">
<asp:ListItem Text="N/A" />
<asp:ListItem Text="Left" />
<asp:ListItem Text="Right" />
</asp:DropDownList>
</td>
<td>
<asp:TextBox ID="txtTariff" runat="server" ReadOnly="true" Text='<%# DataBinder.Eval(Container.DataItem, "Code") %>' />
</td>
<td>
<asp:TextBox ID="txtDescription" runat="server" ReadOnly="true" Text='<%# DataBinder.Eval(Container.DataItem, "Description") %>' />
</td>
<td>
<asp:TextBox ID="txtLabPrice" runat="server" ReadOnly="true" Text='<%# DataBinder.Eval(Container.DataItem, "Invoice") %>' />
</td>
</tr>
</ItemTemplate>
</asp:Repeater>
代码隐藏：
Private Sub ddlEye_SelectedIndexChanged(sender As Object, e As System.EventArgs) Handles ddlEye.SelectedIndexChanged
Dim dEye As DropDownList = DirectCast(sender, DropDownList)
If ddlEye.SelectedItem.Value = "Right" Then
lblLeftLensDesc.Text = "Description of the left lens"
lblRightLensDesc.Text = dEye.SelectedItem.Text
ElseIf ddlEye.SelectedItem.Value = "Left" Then
lblLeftLensDesc.Text = dEye.SelectedItem.Text
lblRightLensDesc.Text = "Description of the right lens"
Else
lblLeftLensDesc.Text = "Description of the left lens"
lblRightLensDesc.Text = "Description of the right lens"
End If
End Sub
我也尝试为 DropDownList 动态创建事件，但这仍然不起作用。
Private Sub rptProducts_ItemDataBound(sender As Object, e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rptProducts.ItemDataBound
Dim dlEye As DropDownList = e.Item.FindControl("ddlEye")
Dim txtDesc As TextBox = e.Item.FindControl("txtDescription")
If Not dlEye Is Nothing AndAlso Not txtDesc Is Nothing Then
dlEye.SelectedIndexChanged += New EventHandler(ddlEye_SelectedIndexChanged)
dlEye.SelectedValue = txtDesc.Text
End If
End Sub
中继绑定代码：
Private Sub loadLineItems(ByVal strTransactionID As String)
Dim objLineItems As ArrayList = Managers.LineItem.GetLineItems(CInt(strTransactionID))
If objLineItems.Count > 0 Then
rptProducts.DataSource = objLineItems
rptProducts.DataBind()
Else
rptProducts.DataSource = Nothing
rptProducts.DataBind()
End If
End Sub
If Not IsPostBack Then
loadLineItems(Session("pstrTransactionID").ToString())
End If
【问题讨论】：
-
我假设您在每次回发时都对
Repeater（或您的UserControl）进行数据绑定，而不仅仅是If Not Page.IsPostaBack。 -
不，我不会在每次回发时都绑定
-
我相信你。但最好还是显示数据绑定的代码，而不是所有数据绑定的东西，而是你调用
rptProducts.DataBind()的部分。