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我尝试使用jQuery ajax选择选项列表，但我需要帮助！VB NET上的错误500 JQUERY AJAX
这是错误
Failed to load resource: the server responded with a status of 500 (Internal Server Error) http://localhost:20440/admin/cadastro.aspx/GetMarcas
我的代码
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta charset="utf-8" />
<title></title>
<link href="../assets/css/bootstrap.min.css" rel="stylesheet" />
<link href="../assets/css/font-awesome.min.css" rel="stylesheet" />
<link href="../assets/css/estilo.css" rel="stylesheet" />
<script src="../assets/js/jquery-1.9.1.min.js"></script>
<script src="../assets/js/bootstrap.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$.ajax({
type: "POST",
contentType: "application/json; charset=UTF-8",
url: "cadastro.aspx/GetMarcas",
data: "{}",
dataType: "json",
success: function (result) {
$('#marca').empty();
$('#marca').append("<option value='0'>--Select--</option>");
$.each(result.d, function (key, value) {
$("#marca").append($("<option></option>").val(value.Codigo).html(value.Descricao));
});
}
});
});
</script>
</head>
<body>
<nav class="navbar navbar-inverse navbar-static-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="index.aspx">DASHBOARD <i class="fa fa-bar-chart"></i></a></li>
<li><a href="cadastro.aspx">CADASTRO <i class="fa fa-plus-circle"></i></a></li>
<li><a href="listagem.aspx">ITEMS CADASTRADOS <i class="fa fa-eye"></i></a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="col-md-12">
<form action="/" method="post">
<div class="col-md-4">
<label>Marca</label>
<select class="form-control" name="marca" id="marca" runat="server">
</select>
</div>
<div class="col-md-4">
<label>Modelo</label>
<select class="form-control" name="modelo" id="modelo" runat="server">
<option value="value">text</option>
</select>
</div>
<div class="col-md-4">
<label>Cor</label>
<select class="form-control" name="cor" id="cor" runat="server">
<option value="value">text</option>
</select>
</div>
<div class="col-md-4">
<label>Ano</label>
<input type="text" name="ano" id="ano" class="form-control" />
</div>
<div class="col-md-4">
<label>Placa</label>
<input type="text" name="placa" id="placa" class="form-control" />
</div>
</form>
</div>
</div>
我控制器
Imports System.Collections.Generic
Imports System.Configuration
Imports System.Data
Imports System.Data.SqlClient
Imports System.Web.Services
Partial Class admin_cadastro
Inherits System.Web.UI.Page
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then marca() End
End Sub
Public Class Marca
Public Property Codigo() As Integer
Get
Return m_Codigo
End Get
Set(value As Integer)
m_Codigo = value
End Set
End Property
Private m_Codigo As Integer
Public Property Descricao() As String
Get
Return m_Descricao
End Get
Set(value As String)
m_Descricao = value
End Set
End Property
Private m_Descricao As String
End Class
<WebMethod>
Public Shared Function GetMarcas() As List(Of Marca)
Dim dt As New DataTable()
Dim objMarca As New List(Of Marca)()
Using con As New SqlConnection(ConfigurationManager.ConnectionStrings("conStr").ConnectionString)
Using cmd As New SqlCommand("exec sp_ListaMarcas", con)
con.Open()
Dim da As New SqlDataAdapter(cmd)
da.Fill(dt)
If dt.Rows.Count > 0 Then
For i As Integer = 0 To dt.Rows.Count - 1
objMarca.Add(New Marca() With {
.Codigo = Convert.ToInt32(dt.Rows(i)("Codigo")),
.Descricao = dt.Rows(i)("Descricao").ToString()
})
Next
End If
Return objMarca
End Using
End Using
End Function
End Class
我没有使用方法回传，我需要帮助雷加ding这个错误，以便从数据库中选择列表数据。
您是否有关于服务器端发生的异常的更多信息？ – PhilDulac