DataGrid点击CheckBox改变选择数时无刷新的方法

 1         <script>
 2         function chgnum(checkboxobj)
 3         {
 4             if(checkboxobj.checked)
 5                 f2.chknum.value = parseInt(f2.chknum.value) + 1;
 6             else
 7                 f2.chknum.value = parseInt(f2.chknum.value) - 1;
 8         }
 9         function checkme(obj,tr)
10         {
11             if(obj.checked)
12             {
13                 tr.style.backgroundColor='#46A3FF';
14             }
15             else
16             {
17                 tr.style.backgroundColor='';
18             }
19             
20             var number = 0;
21             for (var i = 0; i < document.form01.elements.length; i++)
22             {   
23                 var e = document.form01.elements[i]; 
24                 if (e.checked == true && e.type == 'checkbox')
25                 {
26                     number = number + 1;
27                 }
28             }
29             
30             if (document.getElementById("CheckAll_chk").checked == true)
31             {
32                 number = number - 1;
33             }
34             
35             document.getElementById("numberTextBox").value = number;
36         }
37 
38 // function SelectAll(Items)
39 //           {
40 //                var i;
41 //                var item=null;
42 //                var    flag=window.event.srcElement.checked;
43 //                if(!Items)
44 //                    return;
45 //                if(!Items.length)
46 //                    Items.checked=flag;
47 //                else
48 //                {
49 //                    for(i=0;i<Items.length;i++)
50 //                    Items[i].checked = flag;
51 //                }
52 //            }
53         
54         function SelectAll(Items)
55         {
56             var i;
57             var item=null;
58             var    flag=window.event.srcElement.checked;
59             if(!Items)
60                 return;
61             if(!Items.length)
62                 Items.checked=flag;
63             else
64             {
65                 for(i=0;i<Items.length;i++)
66                 Items[i].checked = flag;
67             }
68             
69             if (document.getElementById("CheckAll_chk").checked == true)
70             {
71                 document.getElementById("numberTextBox").value = 50;
72             }
73             else
74             {
75                 document.getElementById("numberTextBox").value = 0;
76             }
77         }
78     </script>
79 //选择改变的数在textbox上马上显示出来,textbox的前台代码为
80 <asp:TextBox ID="numberTextBox" runat="server" Height="16px" Width="20px" BackColor="White" style="border-right: 0px dashed; border-top: 0px dashed; border-left: 0px dashed; border-bottom: 0px dashed; background-color : White;">30</asp:TextBox>条记录
81