我有一个表单来更改一些地址信息。当在文本框中放置一些generic ZIP code
时,会触发客户端事件来填充兼容城市的下拉列表。ASP.NET下拉列表在服务器button_click中为空,ddl填充客户端
填充是正确的,问题是无论我选择哪个值之后,因为当我点击按钮来保存数据时,服务器功能button_click
中的下拉列表有SelectedItem to null
,有aso列表项计数为0 ..
我已经把另一个下拉列表仅仅用于测试,其中有一些随机的城市,如果我通过相同的jquery函数设置一个值,我可以正确地在服务器功能中看到它,所以问题似乎是事实上,另一个是填充客户端..
我见过这个:Asp.Net: Restoring client-side SelectedItem of DropDownList on server-side和设置隐藏字段值的解决方法,但我想知道如果有更正确的方法来做到这一点..
<table>
<tr>
<td>
<label>Address</label><br />
<asp:TextBox ID="txtAddress" CssClass="testo" runat="server"></asp:TextBox>
</td>
</tr>
<tr>
<td>
<label>Province</label><br />
<asp:TextBox ID="txtProvince" runat="server" />
</td>
<td>
<label>City</label><br />
<asp:DropDownList ID="ddlCity" runat="server" />
</td>
<td>
<label>ZIP</label><br />
<asp:TextBox ID="txtZIP" />
</td>
</tr>
<tr>
<td>
<!-- Just for test set ddl by jQuery -->
<asp:DropDownList ID="ddlTest" runat="server" />
</td>
</tr>
<tr>
<td>
<asp:ImageButton ID="btnSave" runat="server"
OnClick="btnSave_Click" />
</td>
</tr>
</table>
$(function() {
$(document).on('keyup', 'input[id*="txtZIP"]', function() {
var input = $(this);
if (input[0].selectionStart == 5) {
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "CleanAddress.aspx/txtZIP_TextChanged",
data: "{ZIP:'" + input.val() + "'}",
dataType: "json",
success: function (response) {
var cities = $.parseJSON(JSON.stringify(response.d));
if (comuni.length > 0) {
$("[id*=txtProvince]").val(cities[0].ID_PROVINCE);
$("[id*='ddlCity']").empty();
$.each(cities, function (key, value) {
$("[id*='ddlCity']").append($("<option />
").val(value.ID_CITY).text(value.CITY));
});
$("[id*='ddlCity']").removeAttr('disabled');
$("[id*='ddlTest']").val(9); // Just for test
$("[id*='ddlComuneDom']").val(cities[0].ID_CITY);
//alert($("[id*='ddlTest']").val());
//alert($("[id*='ddlCity']").val());
}
}
},
error: function (result) {
alert("Errore! " + result.status + " - " + result.statusText);
}
});
}
});
[WebMethod]
public static List<Comuni> txtZIP_TextChanged(string ZIP)
{
try
{
List<Cities> cities = new List<Cities>();
if ((ZIP.Trim() != "") && (ZIP.Length == 5))
{
dcListCitiesDataContext dc = new dcListCitiesDataContext();
if (dc.Cities.Where(c => c.ZIP.Equals(ZIP)).Count() > 0)
{
string province = dc.Cities.Where(c => c.ZIP.Equals(ZIP)).First().ID_PROVINCE.ToUpper();
if (province != null)
{
cities = dc.Cities.Where(c => c.ZIP.Equals(ZIP)).ToList();
return cities;
}
}
}
return cities;
}
catch (Exception ex)
{
Utility.WriteLog("CleanAddress - txtZIP_TextChanged " + " - " + ex.Message, TipoLog.Error);
throw;
}
}
protected void btnSave_Click(object sender, ImageClickEventArgs e)
{
// Here I've always ddlCity empty
string cities= "";
if (ddlCity.SelectedItem != null)
cities= ddlCity.SelectedItem.ToString();
else
cities= ddlTest.SelectedItem.ToString();
(...)
}
要获得当前选定的文本,你应该(';'#dropDownId:selected')。text();' – BNN 2015-03-31 10:29:14
我希望价值服务器端,和客户端选择器#idValue无效,而''%= dropDown.ClientID%>'或$( “[ID * = 'dropDownId']”)。 – MisterFrank 2015-03-31 12:42:25