GridView中的全選操作)

<HeaderTemplate>
<asp:CheckBox ID="chkSelectAll" runat="server" onclick="javascript:SelectAllOrUnSelectAll(this)"
Text="SelectAll" TextAlign="Left" ToolTip="選中所有的Item" /></HeaderTemplate>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate> 

<script language="javascript">
  function SelectAllOrUnSelectAll(object)
    {
     var form = document.forms["form1"];
     var i = 0;
     var loop = 0;
     
     for (loop=0; loop < form.elements.length; loop++)
     {
    
      if(form.elements[loop].type == "checkbox" && object.checked)
      {
       form.elements[loop].checked = true;
      }
      else if(form.elements[loop].type == "checkbox" && !object.checked)
      {
       form.elements[loop].checked = false;
      }
     }       
     return true;
    }
    </script>