here is my code;
$(document).ready(function () {
$('#btnAddCat').click(function () {
var cn = $('#txtCategoryName').val();
alert(cn);
$.ajax({
type: 'Post',
url: "../_ws/news.asmx/InsertCategory",
data: { catName: + cn },
contenttype: 'application/json; charset=utf-8',
datatype: 'json',
async: false,
success: function (msg) {
alert(msg);
},
error: function (msg) {
alert('failure');
alert(msg);
}
});
});
});
and here is the code in news.asmx web service
Imports System.Web
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.Web.Script.Services
' To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line.
'<System.Web.Script.Services.ScriptService()> _
<WebService(Namespace:="http://tempuri.org/")> _
<WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
<Global.Microsoft.VisualBasic.CompilerServices.DesignerGenerated()> _
Public Class News
Inherits System.Web.Services.WebService
<WebMethod()> _
<ScriptMethod(ResponseFormat:=ResponseFormat.Json)>
Public Function InsertCategory(ByVal catName As String) As String
Dim newid = KTOEOS.NewsCategories.InsertCategory(catName)
Return "{'c':" & newid & "}".ToString
End Function
End Class
the returning result is:
<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://tempuri.org/">{'c':21}</string>
If I change the jQuery part to read;
...
data: { catName: + cn },
...
then I get an error:
System.InvalidOperationException: Missing parameter: catName
What am I doing wrong?
Probably it's because you are used to VB being case-insensitive.
Try these lines (note the capitol T):
contentType: 'application/json; charset=utf-8',
dataType: 'json',
Uncomment the below line form your web service code.
<System.Web.Script.Services.ScriptService()>
Why are you setting async
to false
? This will stop the browser completely until server responds.
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