在DataGrid页眉上添加全选的CheckBox控件

很简单的方法,就是用js实现:
 
页面:
 
 <asp:datagrid id="dgUserList" runat="server" Width="640px" BorderColor="White" PagerStyle-HorizontalAlign="Right"
 AllowPaging="True" AllowSorting="True" AutoGenerateColumns="False">
 <AlternatingItemStyle BackColor="#F5F5F5"></AlternatingItemStyle>
 <ItemStyle HorizontalAlign="Center"></ItemStyle>
 <HeaderStyle HorizontalAlign="Center" ForeColor="White" BackColor="#4A95FD" Height="8"></HeaderStyle>
 <PagerStyle HorizontalAlign="Right" Mode="NumericPages"></PagerStyle>
 <Columns>
 <asp:TemplateColumn>
 <HeaderTemplate>
 <asp:CheckBox id="chkAll" runat="server"></asp:CheckBox>
 </HeaderTemplate>
 <ItemTemplate>
 <asp:CheckBox id="chkItem" runat="server"></asp:CheckBox>
 </ItemTemplate>
 </asp:TemplateColumn>
 <asp:BoundColumn DataField="id" HeaderText="序号"></asp:BoundColumn>
 <asp:BoundColumn DataField="username" HeaderText="用户名"></asp:BoundColumn>
 <asp:BoundColumn DataField="workno" HeaderText="工号"></asp:BoundColumn>
 <asp:BoundColumn DataField="dept" HeaderText="部门"></asp:BoundColumn>
 </Columns>
 <PagerStyle Visible="False" HorizontalAlign="Right" Mode="NumericPages"></PagerStyle>
 </asp:datagrid>
 
后台代码:
 
 private void dgUserList_PreRender(object sender, System.EventArgs e)
 {
     foreach (DataGridItem item in dgUserList.Controls[0].Controls)
      {
         if (item.ItemType == ListItemType.Header)
         {
             CheckBox chkAll=(CheckBox)item.FindControl("chkAll");
             System.Text.StringBuilder strScript = new System.Text.StringBuilder("<script language='javascript'> \n");
             strScript.Append(" function checkStatus() { \n");
             strScript.Append(" var bAll = true; \n");
             strScript.Append(" bAll = document.all('" + chkAll.ClientID + "').checked; \n");
 
             for(int i=0; i<dgUserList.Items.Count ; i++)
             {
                 strScript.Append(" document.all('" + dgUserList.Items[i].Cells[0].FindControl("chkItem").ClientID + "').checked = bAll; \n");
             }
             strScript.Append(" } \n");
             strScript.Append("</script> \n");
 
             if(!Page.IsClientScriptBlockRegistered("checkStatus"))
                 Page.RegisterClientScriptBlock("checkStatus",strScript.ToString());
 
                     chkAll.Attributes.Add("onclick","checkStatus()");
             return;
 }
                                    
                                                            【注：本文由控件中国网转载】