获取控件的问题

Question

aspx里的代码如下<asp:DataList ID="DataList3" runat="server" OnSelectedIndexChanged="DataList3_SelectedIndexChanged">         
          <ItemTemplate>       
          <table width="100%" border="0" cellpadding="2" cellspacing="2" class="table2">
            <tr>
              <td valign="top"><strong class="STYLE1">咨询内容</strong>：<span class="hang"><%# Eval("Wenti")%></span></td>
              </tr>  
          </table>
            <table width="100%" border="0" cellpadding="2" cellspacing="2" class="table2">
              <tr>
                <td valign="top" class="STYLE2"><%# Eval("Huida")%></td>
              </tr>
              <tr>
             <asp:Panel ID="Panel1" runat="server" Height="50px" Width="125px"></asp:Panel><asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  <asp:Button ID="Button1" runat="server" Text="Button" />   
              </tr>
          </table> 
       </ItemTemplate>
</asp:DataList>
后台怎么也获取不到Panel1，TextBox1,Button1
但是放在datalist外面却能获取到
 

Answer 1

要先找到DataList3的某行，然后才能FindControl 某个控件

Answer 2

CSDN很多这问题
刚刚看见个，http://topic.csdn.net/u/20090330/18/8721c775-9f10-4ea3-a772-88bf4c991e2f.html
自己多看下

Answer 3

咨询内容后面是用户提出的问题
管理员登陆之后 如果有对这个问题的答复就显示答复 没有就显示文本框和提交按钮现在我想判断一下 如果某个datalist列里的问题有了答复就让 panel隐藏 没有则显示

Answer 4

耶用      for(int i=0;i<DataList3.Items.Count;i++){
             Panel panel1=(Panel)DataList3.Items[i].FindControl("Panel1");
                Label label1=(Label)DataList3.Items[i].FindControl("Label1");
                if (label1.Text.Equals(""))
                {
                    panel1.Visible = true;                }
                else {                    panel1.Visible = false;                
                }
            
            
            }
搞定了 谢谢大家

Answer 5

在数据绑定控件中要通过FindControl来找到控件

Answer 6

在datalist中ItemCommand中这样引用: 
Image img=(Image)e.Item.FindControls("img")

Answer 7

在datalist中ItemCommand中这样引用: 
Image img=(Image)e.Item.FindControls("img")protected void dList_ItemCommand(object source, DataListCommandEventArgs e) 
{ 
if (e.CommandName == "show") 
{ 
string sName = ((Label)e.Item.FindControl("lblName")).Text;//找到控件,得到Text 
} 
}

Answer 8

这样写
for(int i=0;i<DataList3.Items.Count;i++){
             Panel panel1=DataList3.Items[i].FindControl("Panel1") as Panel;
                Label label1=DataList3.Items[i].FindControl("Label1") as Label;
                if (label1!=null&&label1.Text.Equals(""))
                {
                    if(panel1!=null)
                        panel1.Visible = true;                }
                else {
                    if(panel1!=null)
                        panel1.Visible = false;                
                }
            
            
            }

Answer 9

var btn = (Button)e.Item.FindControl("Button")

Answer 10

对了要在家上一个        if(e.Item.ItemType=？？？

Answer 11

<!--为DataList添加OnItemDataBound事件-->
<!-- 页面代码 -->
<asp:DataList ID="DataList3" runat="server" OnSelectedIndexChanged="DataList3_SelectedIndexChanged" OnItemDataBound="DataList3_ItemDataBound">         
    <ItemTemplate>       
        <table width="100%" border="0" cellpadding="2" cellspacing="2" class="table2">
            <tr>
                <td valign="top"><strong class="STYLE1">咨询内容</strong>：<span class="hang"><%# Eval("Wenti")%></span></td>
            </tr>  
        </table>
        <table width="100%" border="0" cellpadding="2" cellspacing="2" class="table2">
            <tr>
                <td valign="top" class="STYLE2"><%# Eval("Huida")%></td>
            </tr>
            <tr>
                <asp:Panel ID="Panel1" runat="server" Height="50px" Width="125px"></asp:Panel><asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>  <asp:Button ID="Button1" runat="server" Text="Button" />   
            </tr>
        </table> 
    </ItemTemplate>
</asp:DataList>//cs文件代码
protected void DataList3_ItemDataBound(object sender, DataListItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        Panel Panel1 = e.Item.FindControl("Panel1") as Panel;
        Response.Write(Panel1.ClientID);
    }
}

Answer 12

//补充cs文件代码
protected void DataList3_ItemDataBound(object sender, DataListItemEventArgs e)
{
    if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
    {
        //获取控件的引用
         Panel Panel1 = e.Item.FindControl("Panel1") as Panel;
        TextBox TextBox1 = e.Item.FindControl("TextBox1") as TextBox;
        Button Button1 = e.Item.FindControl("Button1") as Button;        Response.Write(Panel1.ClientID + "<br>");
        Response.Write(TextBox1.ClientID + "<br>");
        Response.Write(Button1.ClientID + "<br>");    }
}