Question

目前我在asp：repeater中有一个下拉列表。下拉列表包含两个不同的事件。

DataBinding和SelectedIndexChanged。但是SelectedIndexChanged不会触发什么不重要。

这是我的ASP代码：

<asp:UpdatePanel runat="server" UpdateMode="Conditional">
                <ContentTemplate>
                    <asp:Repeater runat="server" ID="_repArticles">
                        <ItemTemplate>
                            <tr>
                                <td>
                                    <img width="130" height="100" src='<%# Eval("ImageFilePath") %>' /> 
                                </td>
                                <td>
                                    <%# Eval("Price") %>
                                </td>
                                <td>
                                    <asp:DropDownList AutoPostBack="true" runat="server" ID="_ddlQuantity" OnDataBinding="_ddlQuantity_DataBinding" OnSelectedIndexChanged="_ddlQuantity_SelectedIndexChanged"></asp:DropDownList>
                                </td>
                                <td>
                                    <%# Eval("TotalPrice") %>
                                </td>
                                <td>
                                    <asp:LinkButton runat="server" ID="_btnRemove" OnClick="_btnRemove_Click" CssClass="close" ToolTip='<%$ Resources: Resource, Remove %>' CommandArgument='<%# Eval("ProductId") %>' ForeColor="Transparent" BackColor="Transparent"></asp:LinkButton>
                                </td>
                            </tr>
                        </ItemTemplate>
                    </asp:Repeater>
                </ContentTemplate>
            </asp:UpdatePanel>

这是我的C＃代码：

protected void _ddlQuantity_DataBinding(object sender, EventArgs e)
    {
        var ddl = sender as DropDownList;

        for (int i = 1; i < Convert.ToInt32(Eval("Stock")); i++)
            ddl.Items.Add(new ListItem(i.ToString(), i.ToString()));

        ddl.SelectedValue = Eval("Quantity").ToString();
    }

    protected void _ddlQuantity_SelectedIndexChanged(object sender, EventArgs e)
    {
        var ddl = sender as DropDownList;

        this.MasterPage.UpdateCartItem(Convert.ToInt32(Eval("ProductId")), Convert.ToInt32(ddl.SelectedValue));

        ddl.SelectedValue = Eval("Quantity").ToString();
    }

我开始认为你不能同时使用这两个事件，有谁知道我做错了什么？

Answer 1

您可以尝试更改

UpdateMode="Always"

来自

UpdateMode="Conditional"

Answer 2

嗯，我得到了解决方案，这是一个很好的时刻。我在页面加载时重新启动了转发器，忘了设置＆＃34; if（！IsPostBack）＆＃34;在它周围。

Answer 3

将触发器放入UpdatePanel，然后尝试

<asp:UpdatePanel runat="server" UpdateMode="Conditional">
            <ContentTemplate>
                <asp:Repeater runat="server" ID="_repArticles">
                    <ItemTemplate>
                        <tr>
                            <td>
                                <img width="130" height="100" src='<%# Eval("ImageFilePath") %>' /> 
                            </td>
                            <td>
                                <%# Eval("Price") %>
                            </td>
                            <td>
                                <asp:DropDownList AutoPostBack="true" runat="server" ID="_ddlQuantity" OnDataBinding="_ddlQuantity_DataBinding" OnSelectedIndexChanged="_ddlQuantity_SelectedIndexChanged"></asp:DropDownList>
                            </td>
                            <td>
                                <%# Eval("TotalPrice") %>
                            </td>
                            <td>
                                <asp:LinkButton runat="server" ID="_btnRemove" OnClick="_btnRemove_Click" CssClass="close" ToolTip='<%$ Resources: Resource, Remove %>' CommandArgument='<%# Eval("ProductId") %>' ForeColor="Transparent" BackColor="Transparent"></asp:LinkButton>
                            </td>
                        </tr>
                    </ItemTemplate>
                </asp:Repeater>
            </ContentTemplate>
<Triggers>
            <asp:PostBackTrigger ControlID="_ddlQuantity" />
        </Triggers>
        </asp:UpdatePanel>

C＃.NET DropDownList OnSelectedIndexChanged未触发

3 个答案: