DROPDOWNLIST在一个中继器，选择指数变化不工作 [英] Dropdownlist in a repeater, selected index changed not working

问题描述

我有它一个DropDownList中继器。当用户更改其索引，我想一个标签来改变其值。 （来自MySQL数据库的ddlSizes值）

I have a repeater with a dropdownlist in it. When a user changes its index, I would like a label to change its value. (the ddlSizes values come from a MySQL DB)

Sizes.aspx

<asp:DropDownList ID="ddlSizes" runat="server" AutoPostBack="True" DataSourceID="objdsSizes"  DataTextField="SizeName" DataValueField="SizeID" />

<asp:Label ID="lbldummy" runat="server" Text=""></asp:Label>

Sizes.aspx.vb

Protected Sub ddlSizes_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlSizes.SelectedIndexChanged
    lbldummy = ddlSizes.value
End Sub

但ddlSizes.SelectedIndexChanged无法识别。因此， lbldummy 的价值不会改变。

有什么建议？谢谢你。

推荐答案

您要创建处理程序的的DropDownList ，在此，你需要有$ C $ ç将发送转换成的DropDownList 然后获取父控件，并将其转换成的RepeaterItem 。从这你就可以参考中的任何其他控件的RepeaterItem

You will want to create the handler for the DropDownList, within this you need to have code which will convert the sender into a DropDownList then get the parent control and convert it into the RepeaterItem. From this you can then reference any other controls within the RepeaterItem

Public Sub ddlSizes_SelectedIndexChanged(sender As Object, e As EventArgs)
    Dim ddlSizes As DropDownList = DirectCast(sender, DropDownList)
    Dim ri As RepeaterItem = DirectCast(ddlSizes.Parent, RepeaterItem)
    Dim lbldummy As Label = DirectCast(ri.FindControl("lbldummy"), Label)
    lbldummy.Text = ddlSizes.SelectedValue
End Sub

然后在你的ddlSizes DROPDOWNLIST添加 OnSelectedIndexChanged =ddlSizes_SelectedIndexChanged，并确保它的AutoPostBack =真设置

Then on your ddlSizes DropDownList add OnSelectedIndexChanged="ddlSizes_SelectedIndexChanged" and make sure it has AutoPostBack="True" set

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