Datalist 中单选按钮上的 Eval ID答案

【问题标题】：Eval ID on radiobutton in DatalistDatalist 中单选按钮上的 Eval ID
【发布时间】：2010-04-18 18:00:13
【问题描述】：

我的代码 gota datalist with radio button and iv made it single selectable onitemdatabound....现在我试图根据选定的单选按钮评估隐藏字段

我的代码是这样的

aspx 代码

<asp:DataList ID="DataList1" runat="server" RepeatColumns = "4"  CssClass="datalist1" 
                RepeatLayout = "Table"  OnItemDataBound="SOMENAMEItemBound"
                CellSpacing="20" onselectedindexchanged="DataList1_SelectedIndexChanged">
                <ItemTemplate>
                <br />
                <table cellpadding = "5px" cellspacing = "0" class="dlTable">
                <tr>
                <td align="center">
                <a href="<%#Eval("FilePath")%>" target="_blank"><asp:Image ID="Image1" runat="server" CssClass="imu" ImageUrl = '<%# Eval("FilePath")%>' 
                Width = "100px" Height = "100px" style ="cursor:pointer" />
                </td>            
                </tr>
                <tr >
                <td align="center">                    
                <asp:RadioButton ID="rdb" runat="server"  OnCheckedChanged="rdb_click" AutoPostBack="True" />            
                <asp:HiddenField ID="HiddenField1" runat="server" Value = '<%#Eval("ID")%>' /> 
                </td>
                </tr>                     
                </table>

 </ItemTemplate> 
</asp:DataList>

后面的代码

 protected void SOMENAMEItemBound(object sender, DataListItemEventArgs e)
        {
            RadioButton rdb;
            rdb = (RadioButton)e.Item.FindControl("rdb");
            if (rdb != null)
                rdb.Attributes.Add("onclick", "CheckOnes(this);");



        }

  protected void rdb_click(object sender, EventArgs e)
        {
            for (int i = 0; i < DataList1.Items.Count; i++)
            {
                RadioButton rdb;
                rdb = (RadioButton)DataList1.Items[i].FindControl("rdb");
                if (rdb != null)
                {
                    if (rdb.Checked)
                    {
                        HiddenField hf = (HiddenField)DataList1.Items[i].FindControl("HiddenField1");
                        Response.Write(hf.Value);
                    }

                }
            }
        }

我正在使用的 javascript...

function CheckOnes(spanChk){


var oItem = spanChk.children;
var theBox= (spanChk.type=="radio") ?
spanChk : spanChk.children.item[0];

xState=theBox.unchecked;
elm=theBox.form.elements;

for(i=0;i<elm.length;i++)
if(elm[i].type=="radio" &&
elm[i].id!=theBox.id)
{
elm[i].checked=xState;
}
}

我遇到了这样的错误

Microsoft JScript runtime error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed. Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules, or server trace is enabled.
Details: Error parsing near 'pload Demonstration|'.

有没有其他方法可以做到这一点，或者任何人都可以帮助解决这个问题

【问题讨论】：

标签： radio-button asp.net datalist

【解决方案1】：

问题可能是您的 Response.Write() 调用。看看this blog post。它概述了出现此特定异常的原因以及如何防止它。也看看this StackOverflow thread。

【讨论】：

【解决方案2】：

Okey 让我们删除响应写入...现在我的代码隐藏中有以下内容...其余相同

label5.text=hf.value.ToString();

现在我可以像这样使用更新面板和嵌套更新面板来评估标签

<asp:UpdatePanel ID="UpdatePanel9" runat="server" >
                <ContentTemplate>

                <asp:DataList ID="DataList1" runat="server" RepeatColumns = "4"  
                        CssClass="datalist1"  OnItemDataBound="SOMENAMEItemBound"
                CellSpacing="10" onselectedindexchanged="DataList1_SelectedIndexChanged" 
                        HorizontalAlign="Center" Width="500px">
                <ItemTemplate>
                <br />
                <table cellpadding = "5px" cellspacing = "0" class="dlTable">
                <tr>
                <td align="center">
                <a href="<%#Eval("FilePath")%>" target="_blank"><asp:Image ID="Image1" runat="server" CssClass="imu" ImageUrl = '<%# Eval("FilePath")%>' 
                Width = "100px" Height = "100px" style ="cursor:pointer" />
                </td>            
                </tr>
                <tr >
                <td align="center"> 
                    <asp:UpdatePanel ID="UpdatePanel3" runat="server">
                    <Triggers>
                   <asp:PostBackTrigger ControlID="rdb" />
                    </Triggers>
                          <ContentTemplate>          
                <asp:RadioButton ID="rdb" runat="server"  OnCheckedChanged="rdb_click" AutoPostBack="true"  /> 

                 </ContentTemplate> 
                </asp:UpdatePanel>

                <asp:HiddenField ID="HiddenField1" runat="server" Value = '<%#Eval("ID")%>' /> 
                </td>
                </tr>                     
                </table>

 </ItemTemplate> 

</asp:DataList>


         </ContentTemplate>
         </asp:UpdatePanel>

有没有办法在没有整页回发的情况下完成这项工作......asyncpostback 触发器似乎不起作用

【讨论】：