Javascript 将下拉值传递给代码隐藏静态方法
我试图在我的代码隐藏自动完成方法中使用语言选择值。我尝试使用隐藏的_字段,但不起作用。而且ajax对我也不起作用 这是我的html下拉菜单:Javascript 将下拉值传递给代码隐藏静态方法,javascript,c#,asp.net,Javascript,C#,Asp.net,我试图在我的代码隐藏自动完成方法中使用语言选择值。我尝试使用隐藏的_字段,但不起作用。而且ajax对我也不起作用 这是我的html下拉菜单: <!-- Language Picker--> <div class="row" hidden="hidden"> <select class="btn btn-default dropdown-toggle" id="lang_sel" style="width: 200px; positio
<!-- Language Picker-->
<div class="row" hidden="hidden">
<select class="btn btn-default dropdown-toggle" id="lang_sel" style="width: 200px; position: relative; left: 19px;" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<option value="no_sel">Please select a language</option>
<option value="German">German</option>
<option value="French">French</option>
<option value="Spanish">Spanish</option>
</select>
</div>
我希望有人有主意
更新
这是我的隐藏字段:
<asp:HiddenField ID="hidden_language" runat="server" ClientIDMode="Static"> </asp:HiddenField >
我尝试用以下方法更改语言:
public void Lang_Change(string lang)
{
language = lang;
}
我用这个ajax函数进行了尝试:
$.ajax({
type: "POST",
url: "/default.aspx/Lang_Change",
contentType: "application/json; charset=utf-8",
data: '{"lang":"' + $("#hidden_language").val() + '"}',
dataType: "html",
success: function ()
{
alert("SUCCESS");
},
error: function ()
{
alert("FAIL");
}
});
但每次都失败了。页面的名称为default.aspx。我不知道路径是否有问题。所以我只发布“将参数传递给codebehind”解决方案。从(我最喜欢的)中,我根据您的要求重新创建了示例,您必须为数据库查询重新创建它:
AjaxTest.aspx
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxTest.aspx.cs" Inherits="AjaxTest" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<!-- Language Picker-->
<select class="btn btn-default dropdown-toggle" id="lang_sel" style="width: 200px; position: relative; left: 19px;" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<option value="no_sel">Please select a language</option>
<option value="German">German</option>
<option value="French">French</option>
<option value="Spanish">Spanish</option>
</select>
<br /> <br />
<input id="btnSetLanguage" type="button" value="Set language" onclick="SetLanguage()" />
</div>
</form>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script type = "text/javascript">
function SetLanguage() {
$.ajax({
type: "POST",
url: "AjaxTest.aspx/Lang_Change",
data: '{language:"' + $("#lang_sel option:selected").text() + '" }',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess,
failure: function (response) {
alert(response.d);
}
});
}
function OnSuccess(response) {
alert(response.d);
}
</script>
</body>
</html>
结果:
因为您试图调用WebMethod,所以需要使用AJAX,这正是它的设计目的。因此,请展示您尝试过的ajax代码,并解释出现了什么问题。从下拉列表中获取所选值并将其发送到服务器应该相当简单
sys_lang
将需要成为您的webmethod的输入参数之一。请检查下面的答案。我对您的解决方案做了一点修改,但总体上还是有效的。非常感谢你
public void Lang_Change(string lang)
{
language = lang;
}
$.ajax({
type: "POST",
url: "/default.aspx/Lang_Change",
contentType: "application/json; charset=utf-8",
data: '{"lang":"' + $("#hidden_language").val() + '"}',
dataType: "html",
success: function ()
{
alert("SUCCESS");
},
error: function ()
{
alert("FAIL");
}
});
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="AjaxTest.aspx.cs" Inherits="AjaxTest" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<!-- Language Picker-->
<select class="btn btn-default dropdown-toggle" id="lang_sel" style="width: 200px; position: relative; left: 19px;" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
<option value="no_sel">Please select a language</option>
<option value="German">German</option>
<option value="French">French</option>
<option value="Spanish">Spanish</option>
</select>
<br /> <br />
<input id="btnSetLanguage" type="button" value="Set language" onclick="SetLanguage()" />
</div>
</form>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js" type="text/javascript"></script>
<script type = "text/javascript">
function SetLanguage() {
$.ajax({
type: "POST",
url: "AjaxTest.aspx/Lang_Change",
data: '{language:"' + $("#lang_sel option:selected").text() + '" }',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: OnSuccess,
failure: function (response) {
alert(response.d);
}
});
}
function OnSuccess(response) {
alert(response.d);
}
</script>
</body>
</html>
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class AjaxTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
[System.Web.Services.WebMethod]
public static string Lang_Change(string language)
{
return "Language selected: " + language;
}
}