求救 ASP.NET,C#,JQuery

我想 从Datalist搵TextBox的ID，然后放入JQuery DatePicker，但系执行后发现variable:lease 系undefined
我希望有人能够帮帮手，谢谢！！ Reference website:
如果我的Datalist 一开始是没有DATA, error会显示:"lease" is not in the current context, 这与Datalist 没有任何资料有关吗?

Source Codehtml)<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css"/><script src="http://code.jquery.com/jquery-1.9.1.js"></script><script src="http://code.jquery.com/ui/1.10.3/jquery-ui.js"></script> <script　type="text/javascript">
$(function() {
var lease = $('#<%= edit_period_list.ClientID %>').find('input:text[id$="edit_lease_from"]').val(); (lease = undefined)


var holiday = ["12/24/2012","12/25/2012"];


$("#<%= from.ClientID %>, lease").datepicker({
setDate: 'dd/mm/yy',
dateFormat: 'dd/mm/yy',
changeMonth: true,
changeYear: true,
minDate: "-5y",
maxDate: "+5y",
beforeShowDay: function (date) {


if (date.getDay() == 0 || date.getDay()== 6)
{ return [false, '', '']; } //No Weekends


for (var i = 0; i < holidays.length;i++) {
if (new Date(holidays).toString() ==date.toString())
{ return [true, 'Highlight', '']; } //NoHolidays


}
return [true, ''];
}
});


});

</script><asp:TextBox ID="from" runat="server"AutoPostBack="True"
></asp:TextBox>　　＜－－没问题


<asp　ＤataListID="edit_period_list" runat="server"DataKeyField="period_id"
DataSourceID="edit_period_data"
>

<ItemTemplate>
<tableborder="0" cellpadding="0" cellspacing="0"
style="border-collapse: collapse; width:1135px;">


<tr>
<td class="one">
<asp:TextBoxID="edit_lease_from" runat="server"
Text='<%#Eval("lease_from","{0:dd/MM/yyyy}") %>' ></asp:TextBox>
</td>

<td class="two">
<asp:TextBoxID="edit_lease_to" runat="server"
Text='<%#Eval("lease_to","{0:dd/MM/yyyy}") %>' ></asp:TextBox>
</td>

</tr>

</table>
</ItemTemplate>
</aspＤataList> $(function() { var lease = $('#<%= edit_period_list.ClientID %>').find('input:text[id$="edit_lease_from"]').val(); (lease = undefined) var holiday = ["12/24/2012","12/25/2012"]; $("#<%= from.ClientID %>, lease").datepicker({ setDate: 'dd/mm/yy', dateFormat: 'dd/mm/yy', changeMonth: true, changeYear: true, minDate: "-5y", maxDate: "+5y", beforeShowDay: function (date) { if (date.getDay() == 0 || date.getDay()== 6) { return [false, '', '']; } //No Weekends for (var i = 0; i < holidays.length;i++) { if (new Date(holidays).toString() ==date.toString()) { return [true, 'Highlight', '']; } //NoHolidays } return [true, '']; } });}); 　　＜－－没问题 [table=98%]<asp:textboxid="edit_lease_from"[ color]="" runat="server" [="" size][="" font]="" " text=""> <asp:textboxid="edit_lease_to" runat="server" [="" size][="" font]="" " text="">

[ 本帖最后由 saturn1022 於 2013-9-12 08:05 PM 编辑 ]

系 data list 里面，根本唔会有呢个 edit_lease_from 的 ID。你用 view source 睇下就知。

Datalist 里面有好多 item，都唔会只有一个 edit_lease_from，会唔会 logic 根本上有问题。