我想在DataGrid 里加一列选择框,同时额外增加一个"全选"选择框,
通过"全选"选择框来控制全选或全不选
但是按照下面的代码,有这样一个问题,就是只能实现全选,但实现不了全不选private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if ((e.Item.ItemType == ListItemType.Item) ||
(e.Item.ItemType == ListItemType.AlternatingItem) ||
(e.Item.ItemType == ListItemType.SelectedItem) )
{
CheckBox cb ;
//加选择框
cb = new CheckBox();
e.Item.Cells[0].Controls.Add(cb); //在DataGrid最后一行加"全选"选择框
if(e.Item.ItemIndex == this.DataGrid1.PageSize - 1)
{
cb = new CheckBox();
cb.Text = "全选";
cb.AutoPostBack = true;
cb.CheckedChanged += new System.EventHandler(CheckAll);//-----lag1
e.Item.Cells[0].Controls.Add(cb);
}
}
}private void CheckAll(object sender, System.EventArgs e)
{
CheckBox ocb = (CheckBox)sender;//--------------------------------lag2 foreach(DataGridItem oDgi in this.DataGrid1.Items)
{
if(oDgi.Cells[0].HasControls())
{
CheckBox cb = (CheckBox)oDgi.Cells[0].Controls[0];
cb.Checked = ocb.Checked;
}
}
}现在这些代码运行的问题是,当一开始点击"全选"后,能运行到lag1和lag2,所以能实现全选。
当再次点击"全选",就只能运行到fag1,却运行不到fag2,所以就不能实现全不选。
以后再点击"全选",就按照上面两步不断的循环了恳请高手赐教!
通过"全选"选择框来控制全选或全不选
但是按照下面的代码,有这样一个问题,就是只能实现全选,但实现不了全不选private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
{
if ((e.Item.ItemType == ListItemType.Item) ||
(e.Item.ItemType == ListItemType.AlternatingItem) ||
(e.Item.ItemType == ListItemType.SelectedItem) )
{
CheckBox cb ;
//加选择框
cb = new CheckBox();
e.Item.Cells[0].Controls.Add(cb); //在DataGrid最后一行加"全选"选择框
if(e.Item.ItemIndex == this.DataGrid1.PageSize - 1)
{
cb = new CheckBox();
cb.Text = "全选";
cb.AutoPostBack = true;
cb.CheckedChanged += new System.EventHandler(CheckAll);//-----lag1
e.Item.Cells[0].Controls.Add(cb);
}
}
}private void CheckAll(object sender, System.EventArgs e)
{
CheckBox ocb = (CheckBox)sender;//--------------------------------lag2 foreach(DataGridItem oDgi in this.DataGrid1.Items)
{
if(oDgi.Cells[0].HasControls())
{
CheckBox cb = (CheckBox)oDgi.Cells[0].Controls[0];
cb.Checked = ocb.Checked;
}
}
}现在这些代码运行的问题是,当一开始点击"全选"后,能运行到lag1和lag2,所以能实现全选。
当再次点击"全选",就只能运行到fag1,却运行不到fag2,所以就不能实现全不选。
以后再点击"全选",就按照上面两步不断的循环了恳请高手赐教!
解决方案 »
- "正由另一进程使用"的错误,怎么解决?
- 关于checkboxlist的问题
- 一个非常非常非常非常非常非常非常非常郁闷的问题!!!!!!!!!!!!!!!!!!
- 用OracleConnection 连接对象向oracle表插入数据 提示ORA-01036: 非法的变量名/编号
- 请教如何取listview控件中指定行、列的值?
- 急!急!急!关于下载文件的问题
- 请问内容分页怎么分啊,如果内容中又包含图片那又怎样分页呢
- web页面下无法显示水晶报表
- 各位老大,我要疯了,帮我解决下这个问题,在线等
- 请看以下sql语句那里错了?大家帮忙
- 错误模块名称: MSVCR90.dll
- 各位大侠,我用aspxgrid控件,怎么一双击,不是进入编辑模式,而是变成了空白了呀
<%@ 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">20</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="获得选中记录的id"></asp:Button></TD>
</TR>
</TABLE>
</form>
</body>
</HTML>
using System;
using System.Data;
using System.Web;
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();
this.Button1.Attributes.Add("onclick","return confirm('您确认要删除所有选中的记录吗?');");
} 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;
if(a.Length>0)
{
string sql = "delete from table1 where id in ("+a.TrimEnd(',')+")"; System.Data.OleDb.OleDbConnection cnn = new System.Data.OleDb.OleDbConnection("连接字符串");
System.Data.OleDb.OleDbCommand cm = new System.Data.OleDb.OleDbCommand(sql,cnn);
cnn.Open();
int deletedRowsCount = cm.ExecuteNonQuery();
cnn.Close();
}
}
#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 }
}
function CheckAll(form)
{
for (var i=0;i<form.elements.length;i++)
{
var e = form.elements[i];
if (e.name != 'chkall')
e.checked = form.chkall.checked;
}
}
</script><asp:HyperLink id=Hyperlink3 runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "P_ID") %>' Visible="False"></asp:HyperLink><asp:CheckBox id="selected" runat="server"></asp:CheckBox><input type="checkbox" name="chkall" value="on" onclick="CheckAll(this.form)" title='選中/取消 所有'>.
.
.
我试过模板列,是可以实现。
上面的高手可以详细的说一下这个错误吗?
private void Page_Load(object sender, System.EventArgs e)
{
//if(!IsPostBack)缺少了这个
BindData();//绑定数据到DataGrid}
所以楼主每次的全选,实际上都是重新绑定的数据
强yin
"全选"能实现,是因为他会触发CheckAll()方法!解决的办法就是,定义一个静态变量保存"全选"按钮的状态值,再调用即可:
public static bool CheckState;
//然后在这条语句cb.CheckedChanged += new System.EventHandler(CheckAll);前面重新赋值:cb.Checked = CheckState;
cb.CheckedChanged += new System.EventHandler(CheckAll);//-----lag1
//当然,CheckAll方法里还要保存"全选"的值:
CheckBox ocb = (CheckBox)sender;//--------------------------------lag2
CheckState = ocb.Checked;
"全选"选择框是每次都加载的,
现在我觉得困惑的是,为什么每次运行都能运行到fag1,但就是隔一次才能运行到fag2``
很郁闷`
可能是我对事件了解不够``怎么想都想不明白``
谢谢`
你说到了错误的根本了``
你点了“全选”复选框就能运行:fag1这条触发事件的语句。但点了一次后,就不再执行"CheckAll"了,因为系统认为“全选”的状态并没有改变
如果用if(!IsPostBack),按全选后,复选框都会丢失。除非自己又重新绑定DataGrid!