在DataGrid中怎么获取不到选中CheckBox

yangming006 2006-03-23 11:22:58

在datagrid中有一个模版列
页面代码
<asp:TemplateColumn HeaderText="选择">
<ItemTemplate>
<asp:CheckBox ID ="chk" Runat =server ></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>

c#代码
private void Button_del_Click(object sender, System.EventArgs e)
{
string ids = "";
foreach(DataGridItem item in DataGrid1.Items)
{
CheckBox box = (CheckBox)item.FindControl("chk");
if(box.Checked)
{
ids += DataGrid1.DataKeys[item.ItemIndex].ToString() + ",";
}
}
Response.Write(ids);
Response.End();
}

问题：
当我选择一行，或几行，ids还是为空。不知道为什么？
我用的vs2003

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yangming006 2006-03-23

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谢谢大家了！

Eddie005 2006-03-23

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using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace bsTest2005_8_16.Samples
{
/// <summary>
/// DataGrid翻页多选的摘要说明。
/// </summary>
public class DataGrid翻页多选 : System.Web.UI.Page
{
protected System.Web.UI.WebControls.TextBox TextBox1;
protected System.Web.UI.WebControls.Button Button1;
protected System.Web.UI.WebControls.TextBox TextBox2;
protected System.Web.UI.WebControls.TextBox Textbox6;
protected System.Web.UI.WebControls.TextBox Textbox3;
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
{
if(!IsPostBack)
BindData();

}

private void BindData()
{
//模拟出一些原始数据绑定DataGrid
DataTable dt1 = new DataTable();
dt1.Columns.Add("field1");
dt1.Columns.Add("field2");
dt1.Columns.Add("field3");

Random radm = new Random();
for(int i=1;i<30;i++)
dt1.Rows.Add(new object[]{"id"+i.ToString(),(i+1)*(i+2)," ABC"+radm.Next(10000).ToString()});

this.DataGrid1.DataSource=dt1;
this.DataGrid1.DataBind();
}

private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
{
this.DataGrid1.CurrentPageIndex = e.NewPageIndex;
BindData();
}

private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if(e.Item.ItemType == ListItemType.Header)
{
CheckBox cb = e.Item.Cells[0].FindControl("CheckBoxAll") as CheckBox;
cb.Attributes.Add("onclick","selectAll(this);");//本页全选或取消的脚本函数
}
if(e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
{
CheckBox cb = e.Item.Cells[0].FindControl("CheckBox1") as CheckBox;
cb.Attributes.Add("onclick","selectOne(this);");//选中或取消当前行的脚本函数

//如果当前行已选，那么checkbox应该勾上
string curID = e.Item.Cells[1].Text;
if(this.TextBox1.Text.IndexOf(curID)>-1)
cb.Checked = true;
}

}

private void Button1_Click(object sender, System.EventArgs e)
{
string a = this.TextBox1.Text;

}

#region Web 窗体设计器生成的代码
override protected void OnInit(EventArgs e)
{
//
// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.DataGrid1.PageIndexChanged += new System.Web.UI.WebControls.DataGridPageChangedEventHandler(this.DataGrid1_PageIndexChanged);
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.Button1.Click += new System.EventHandler(this.Button1_Click);
this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

}
}

Eddie005 2006-03-23

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<%@ Page language="c#" Codebehind="DataGrid翻页多选.aspx.cs" AutoEventWireup="false" Inherits="bsTest2005_8_16.Samples.DataGrid翻页多选" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
<title>DataGrid翻页多选</title>
<meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
<meta name="CODE_LANGUAGE" Content="C#">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
<script language="javascript">
function selectAll(obj)
{
var i = 3;
var cbname = "DataGrid1__ctl"+i+"_CheckBox1";//DataGrid里嵌套的CheckBox的id是有规律的，利用之
while(document.getElementById(cbname)!=null && ((checkSelected() && obj.checked) || !obj.checked))
{
document.getElementById(cbname).checked = obj.checked;
selectOne(document.getElementById(cbname));
i = i+1;
cbname = "DataGrid1__ctl"+i+"_CheckBox1";
}
}

function selectOne(obj)
{
var curID = obj.parentElement.parentElement.cells[1].innerText;
var selectedID = document.getElementById('TextBox1').value;
if(obj.checked)
{
if(selectedID.indexOf(curID)<0)
{
if(checkSelected(obj))
{
document.getElementById('TextBox1').value = selectedID + curID + ',';
var count = new Number(document.getElementById('TextBox2').value);
document.getElementById('TextBox2').value = count + 1;
}
else
{
obj.checked = false;
}
}
}
else
{
if(selectedID.indexOf(curID)>-1)
{
var count = new Number(document.getElementById('TextBox2').value);
document.getElementById('TextBox2').value = count - 1;
}
document.getElementById('TextBox1').value = selectedID.replace(curID,'').replace(",,",",");

}
}

function checkSelected(obj)
{
var count1 = new Number(document.getElementById('TextBox2').value);
var count2 = new Number(document.getElementById('TextBox3').value);
if(count1 >= count2)
{
alert("您好，请选择不多于"+count2+"条记录");
return false;
}
else
{
return true;

}
}
</script>
</HEAD>
<body MS_POSITIONING="GridLayout">
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" style="Z-INDEX: 103; LEFT: 8px; POSITION: absolute; TOP: 8px" cellSpacing="0"
cellPadding="0" width="80%" border="0">
<TR>
<TD>隐藏域：
<asp:TextBox id="TextBox1" runat="server"></asp:TextBox>
<asp:TextBox id="TextBox2" runat="server" Width="40px">0</asp:TextBox></TD>
<TR>
<TD>最多选择
<asp:TextBox id="Textbox3" runat="server" Width="40px">4</asp:TextBox>条记录</TD>
</TR>
<TR id="tr1">
<TD id="td1">
<asp:DataGrid id="DataGrid1" runat="server" AutoGenerateColumns="False" PageSize="8" AllowPaging="True">
<Columns>
<asp:TemplateColumn>
<HeaderStyle HorizontalAlign="Center"></HeaderStyle>
<ItemStyle HorizontalAlign="Center"></ItemStyle>
<HeaderTemplate>
<asp:CheckBox id="CheckBoxAll" runat="server" Text="本页全选"></asp:CheckBox>
</HeaderTemplate>
<ItemTemplate>
<asp:CheckBox id="CheckBox1" runat="server"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>
<asp:BoundColumn DataField="field1"></asp:BoundColumn>
<asp:BoundColumn DataField="field2"></asp:BoundColumn>
<asp:BoundColumn DataField="field3"></asp:BoundColumn>
</Columns>
</asp:DataGrid></TD>
</TR>
<TR>
<TD><asp:Button id="Button1" runat="server" Text="Button"></asp:Button></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>

exboy 2006-03-23