<asp:TextBox ID="txtDate" CssClass="Wdate" Style="width: 91px;" runat="server"

onfocus="WdatePicker({maxDate:'%y-%M-%d',isShowClear:false,readOnly:true})"
                        onpropertychange="showValue(this.value)" ></asp:TextBox>

日
                    <asp:HiddenField ID="hiddenDate" runat="server"

OnValueChanged="hiddenDate_ValueChanged"
                        EnableViewState="false" />
 <div style="display: none;">
                        <asp:ImageButton ID="btnHid" runat="server"

ImageUrl="~/Resource/images/Btn_Find.gif"
                            CausesValidation="false" align="absmiddle"

OnClick="btnHid_Click" />
                    </div>

<script type="text/javascript">
        //記錄用戶上一次輸入的日期。
        var today = new Date();
        var todayMonth;
        var todayDate;

        //格式化當前“月”，“日”格式。
        if ((today.getMonth() + 1) < 10) {
            todayMonth = "0" + (today.getMonth() + 1);
        }
        if (today.getDate() < 10) {
            todayDate = "0" + today.getDate();
        }

        //獲得當前的日期。
        var oldValue = //www.49028c.com/Health/archive/2012/02/10/today.getFullYear() +"-" + todayMonth + "-" + todayDate;

        function showValue(obj) {
            //當查詢日期不為空時，就觸發查詢按鈕。
            if (obj != "" && obj != oldValue) {
                oldValue = //www.49028c.com/Health/archive/2012/02/10/obj;
                $('#txtName').get(0).select();
                $("#hiddenDate").val(obj);
                $('#btnHid').trigger("click");
                return false;
            }
        }
    </script>

    //根據用戶選擇的時間查詢。
    protected void hiddenDate_ValueChanged(object sender, EventArgs e)
    {
       //后臺代碼
    }

    //根據用戶選擇的時間查詢。
    protected void btnHid_Click(object sender, ImageClickEventArgs e)
    {
        //后臺代碼
    }