Question

我使用下面的代码填充一个ASP.Net下拉列表，其中包含来自Ajax调用Json Response的值。

$.ajax({
            type: "POST",
            url: "Default.aspx/SelectMoveToFund",
            data: JSON.stringify(params),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (data) {
                $('select').select2('destroy');
                var ddl = $("#" + fundId);

                ddl.empty().append('<option selected="selected" value="0">Please select</option>');
                $.each(data.d, function () {
                    ddl.append($("<option></option>").val(this['Value']).html(this['Text']));
                });
                $('select').select2();

            },
            error: function (data) {
                console.log("error :" + data);
                console.log(data);
            }
        });

这适用于填充ASP.Net Webforms页面上数据网格中保存的目标下拉列表。

我遇到的问题是当页面回发并迭代遍历数据网格的每一行时，它不会传递列表中所选项目的值。

 For Each item As DataGridItem In dgUnsuitableSwitch.Items
                    Dim ddlFund As DropDownList = DirectCast(item.FindControl("ddlFund"), DropDownList)

 Next

Datagrid是这样组成的，其中一部分是从已知数据的数据表中填充的，其余部分由客户信息组成。

<asp:DataGrid runat="server" CssClass="tab table table-bordered table-striped table-hover " ID="dgUnsuitableSwitch" AutoGenerateColumns="False">
<Columns>
    <asp:BoundColumn DataField="Fund Name" HeaderText="Fund Name" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre"></asp:BoundColumn>
    <asp:BoundColumn DataField="Fund Risk Profile" HeaderText="Fund Risk Profile" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre"></asp:BoundColumn>
    <asp:BoundColumn DataField="Customer Name" HeaderText="Customer Name" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre"></asp:BoundColumn>
    <asp:BoundColumn DataField="Investment Date" HeaderText="Investment Date" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre"></asp:BoundColumn>

    <asp:TemplateColumn HeaderText="Years Held" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:TextBox runat="server" CssClass="form-control" placeholder="Years" ID="txtUsYears"></asp:TextBox>
            <ajaxToolkit:FilteredTextBoxExtender ID="filtertxtYears" runat="server"
                Enabled="True" TargetControlID="txtUsYears" FilterType="Custom" ValidChars="0123456789"></ajaxToolkit:FilteredTextBoxExtender>
        </ItemTemplate>
    </asp:TemplateColumn>

    <asp:TemplateColumn HeaderText="Amount (£)" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:TextBox runat="server" CssClass="form-control" placeholder="Amount"  ID="txtUsAmount"></asp:TextBox>
            <ajaxToolkit:FilteredTextBoxExtender ID="filtertxtsAmount" runat="server"
                Enabled="True" TargetControlID="txtUsAmount" FilterType="Custom" ValidChars=".-0123456789"></ajaxToolkit:FilteredTextBoxExtender>
        </ItemTemplate>
    </asp:TemplateColumn>

    <asp:TemplateColumn HeaderText="Switching to Product" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:DropDownList runat="server" Width="200px" CssClass="centre ddlMoveToProduct" ID="ddlProduct">
            </asp:DropDownList>
        </ItemTemplate>
    </asp:TemplateColumn>

    <asp:TemplateColumn HeaderText="Switching to Fund" HeaderStyle-CssClass="centre ddlMoveToFund" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:DropDownList runat="server" Width="200px" CssClass="centre ddlFund" ID="ddlFund">
            </asp:DropDownList>
        </ItemTemplate>
    </asp:TemplateColumn>

    <asp:TemplateColumn HeaderText="Switching to Amount (£)" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:TextBox runat="server" CssClass="form-control" placeholder="Amount" ID="txtSwitchToAmount"></asp:TextBox>
            <ajaxToolkit:FilteredTextBoxExtender ID="filtertxtSwitchToAmount" runat="server"
                Enabled="True" TargetControlID="txtSwitchToAmount" FilterType="Custom" ValidChars=".-0123456789"></ajaxToolkit:FilteredTextBoxExtender>
        </ItemTemplate>
    </asp:TemplateColumn>

    <asp:TemplateColumn HeaderText="Switching to Lump Sum Amount (£)" HeaderStyle-CssClass="centre" ItemStyle-CssClass="centre">
        <ItemTemplate>
            <asp:TextBox runat="server" CssClass="form-control"  placeholder="Amount" ID="txtSwitchToLumpSumAmount"></asp:TextBox>
            <ajaxToolkit:FilteredTextBoxExtender ID="filtertxtSwitchToLumpSumAmount" runat="server"
                Enabled="True" TargetControlID="txtSwitchToLumpSumAmount" FilterType="Custom" ValidChars=".-0123456789"></ajaxToolkit:FilteredTextBoxExtender>
        </ItemTemplate>
    </asp:TemplateColumn>

</Columns>

非常感谢任何和所有帮助。

由于

西蒙

Answer 1

我现在找到了一个有效的解决方案，

Protected Sub ddlProduct_Change(sender As Object, e As EventArgs)

    Dim ddl As DropDownList = DirectCast(sender, DropDownList)
    Dim rowdIdx = Convert.ToInt16(ddl.ClientID.Remove(0, ddl.ClientID.Length - 1))

    Dim ddlFund As DropDownList = CType(dgUnsuitableSwitch.Items(rowdIdx).Cells(0).FindControl("ddlUsFund"), DropDownList)

    Dim dt = GetFundsToMoveTo(ddl.SelectedValue)

    For Each row As DataRow In dt.Rows
        ddlFund.Items.Add(row(0).ToString())
    Next


End Sub

ASP.Net Postback事件未获得选定值

1 个答案: