全选ＪＳ代码

/*
待选：
<asp:CheckBox Runat="server" ID="chkSelectState" Enabled='<%# IsEnable((int)DataBinder.Eval(Container.DataItem,"UseStateInUser")) %>' Checked='<%# IsChecked((int)DataBinder.Eval(Container.DataItem,"UseStateInUser")) %>' OnClick="javascript: return select_deselectAll (this.checked, this.id);">

让整个表单的CheckBox全选择
<asp:checkbox id="CheckAll" onclick="javascript: return select_deselectAll (this.checked, this.id);" runat="server"></asp:checkbox></asp:CheckBox>
*/
function select_deselectAll (chkVal, idVal)
{
   var frm = document.forms[0];
    // Loop through all elements
   for (i=0; i<frm.length; i++)
   {
       if(frm.elements[i].disabled == false )
       {
          // Look for our Header Template's Checkbox
          if (idVal.indexOf ('CheckAll') != -1)
          {
             // Check if main checkbox is checked, then select or deselect datagrid checkboxes
             if(chkVal == true)
             {
                frm.elements[i].checked = true;
             }
             else
             {
                frm.elements[i].checked = false;
             }
             // Work here with the Item Template's multiple checkboxes
        }
        else if (idVal.indexOf ('DeleteThis') != -1)
        {
            // Check if any of the checkboxes are not checked, and then uncheck top select all checkbox
            if(frm.elements[i].checked == false)
            {
                frm.elements[1].checked = false; //Uncheck main select all checkbox
            }
        }
      }
   }
}