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I am learning JQuery and today what I am making is a cascading dropdown (Country State and City).
My code so far is as under
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<script type="text/javascript" src="JQuery/jquery-1.6.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#ddlCountry").change(function() {
var CountryID = $("#ddlCountry option:selected").val();
$.ajax(
{
type: "POST",
url: "CascadingDropDown.aspx/GetSelectedStates",
data: "{countryID:'" + CountryID + "'}",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function(data) {
alert(data);
},
error: function() { alert(arguments[2]); }
});
});
});
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>Country</td>
<td>
<asp:DropDownList ID="ddlCountry" runat="server"/>
</td>
<td>State</td>
<td>
<asp:DropDownList ID="ddlState" runat="server"/>
</td>
<td>City</td>
<td>
<asp:DropDownList ID="ddlCity" runat="server"/>
</td>
</tr>
<tr>
<td colspan="2">
<asp:Button ID="btnSave" runat="server" Text="Save" />
</td>
<td>
<asp:Label ID="lblMessage" runat="server"></asp:Label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
The web method is as under
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web.Services;
public partial class CascadingDropDown : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
PopulateCountry();
}
}
private void PopulateCountry()
{
DataSource ds = new DataSource();
ddlCountry.DataSource = ds.GetCountryList();
ddlCountry.DataValueField = "CountryCode";
ddlCountry.DataTextField = "CountryName";
ddlCountry.DataBind();
}
[WebMethod]
public List<State> GetSelectedStates(string countryID)
{
DataSource ds = new DataSource();
var stateList = ds.GetStateList();
var result = stateList.Where(i => i.CountryCode == countryID);
return result.ToList<State>();
}
}
But while I am choosing any country from the country drop down, I am getting "Internal Server Error".
Could anyone please help me in point out what mistake I am making and how to overcome this?
540
You need the keyword static in your signature. In VB.net you would use shared.
For example:
C#: public static string DoSomething()
VB: Public Shared Function DoSomething()
100
answered Feb 27 '26 18:02
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