JavaScript刪除確認代碼，判斷checkbox是否被選中代碼

//在用戶端瀏覽器用一個JavaScript來判斷使用者是否選擇了記錄！ 

<script type="text/javascript">
    function check_selected()
    {   var checkBoxList = document.getElementsByTagName("INPUT");
        var count = 0;
        for(var i = 0 ;i < checkBoxList.length; i++)
        {   if(checkBoxList[i].type == "checkbox")
                if(checkBoxList[i].checked)
                    count++;
        }
        if(count <= 0)
        {   alert("請選擇您要刪除的記錄！")
            return false;
        }
        else
        {   if(!confirm("確定刪除該記錄嗎？"))
                return false;
            else
                return true;
        }
    }
</script>

<asp:Button ID="btn_retrieve" runat="server" Text="確定" OnClick="btn_retrieve_Click" />
            <input id="btn_add" title="添加" type="button" value="添加" onclick="return btn_add_onclick()" />
            <asp:Button ID="btn_del" runat="server" OnClick="btn_del_Click" Text="刪除" OnClientClick="return check_selected()" />

轉載自：http://auv2009.blog.163.com/blog/static/68858712200962033536561/