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Ajax error calling web method

I am trying to set the date in a Bootstrap datetime picker based on drop down list selection change. I am using a web method (C#) to return "start date" given a "certificate ID".
I tried using "text" data type instead of "json" but keep getting "Cannot convert object of type System.String to type System.Collections.Generic.IDictionary"
I searched for this error type and could not find something that would resolve this issue.
$("#ddlCertificate").change(function () {
....
debugger
setStartDate($("#ddlCertificate").val());
});
function setStartDate(certItemID) {
var param = JSON.stringify(certItemID, null, 2);
$.ajax({
type: "POST",
dataType: "text",
contentType: "application/json; charset=utf-8",
url: "../services/easg.asmx/GetCertItemStartDate",
cache: false,
data: param,
}).done(function (result) {debugger
$("#tbStartDate").val(result.d);
}).fail(function (jqXHR, textStatus, errorThrown) {debugger
alert(textStatus + ' - ' + errorThrown);
});
}
Web Method:
[WebMethod]
[ScriptMethod(UseHttpGet = false, ResponseFormat = ResponseFormat.Json)]
public string GetCertItemStartDate(string certID)
{
int iCertItemID = int.Parse(certID);
DateTime dtStartDate = CertItem.GetCertItemStartDate(iCertItemID);
string JSONresult;
JSONresult = JsonConvert.SerializeObject(dtStartDate);
return JSONresult;
}

The problem was the way the parameter was being passed. In ajax call, I had:
data: param,
and had to change it to:
$("#ddlCertificate").change(function () {
....
var certID = "{ 'certID': '" + $('#ddlCertificate').val() + "'}";
setStartDate(certID);
});
function setStartDate(certItemID) {
$.ajax({
type: "POST",
dataType: "json",
contentType: "application/json; charset=utf-8",
url: "../services/easg.asmx/GetCertItemStartDate",
cache: false,
data: certItemID,
}).done(function (result) {
var startDate = JSON.parse(result.d);
setStartDate(new Date(startDate));
}).fail(function (jqXHR, textStatus, errorThrown) {
alert(textStatus + ' - ' + errorThrown);
});
}

Asp.net ajax request (internal server error)

i create web method and create ajax request to call this web method i have internal server error but when i call webservice from URL direct is working fine my ajax request :
$(document).ready(function () {
$('#btnsave').click(function () {
var x = 'sss';
$.ajax({
url: "/WS/WS.asmx/AddCustomer",
type: 'GET',
dataType: 'json',
data: { CustomerType: x },
contentType: 'application/json; charset=utf-8',
error: function (XMLHttpRequest, textStatus, errorThrown){
alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
},
success: function (response) {
if (response.d) {
}
}
});
});
});`

try this, look (data: "{CustomerType:'" + x+ "'}",)...
$(document).ready(function () {
$('#btnsave').click(function () {
var x = 'sss';
$.ajax({
url: "/WS/WS.asmx/AddCustomer",
type: 'GET',
dataType: 'json',
data: "{CustomerType:'" + x+ "'}",
contentType: 'application/json; charset=utf-8',
error: function (XMLHttpRequest, textStatus, errorThrown) {
alert("Request: " + XMLHttpRequest.toString() + "\n\nStatus: " + textStatus + "\n\nError: " + errorThrown);
},
success: function (response) {
if (response.d) {
}
}
});
});
});

I had the same bug, see below the code, it works for me although if it doesn't work, change type: 'POST'.
$.ajax({
url: 'your URL',
type: 'GET',
contentType: "application/json; charset=utf-8",
datatype: 'JSON'
}).fail(function (jqXHR, textStatus, errorThrown) {
alert(textStatus + " : " + errorThrown);
}).done(function (JSData) {
for (var i = 0; i < JSData.length; i++){
//your code
}
});

JSON-data to WebMethod using jQuery returning errors

I'm trying to send a json list populated with the id's from the 'data-seq' attribute only when the 'value' == true.
I have tried out a lot solution but it keeps getting me error messages, the most common are "there is no parameterless constructor for the type string" when using string[] or "string is not supported for deserialization of an array" when using string as code-behind parameter in the WebMethod.
function sentData() {
var json = [];
$('.btn[value="true"]').each(function () {
var obj = {
id: $(this).attr("data-seq")
};
json.push(obj);
});
json = JSON.stringify({ jsonList: json });
console.log(json); // {"jsonList":[{"id":"38468"},{"id":"42443"},{"id":"42444"}]} (the right id's are getting stored)
$.ajax({
type: "POST",
async: true,
url: "Default.aspx/getList",
dataType: "json",
data: json,
contentType: "application/json; charset=utf-8",
error: function (jqXHR, textStatus, errorThrown) {
console.log('bad, ' + errorThrown + ", " + jqXHR.responseText + ", " + textStatus);
},
success: function(json){
//do something with the result
}
});
return false;
}
// Code-Behind
[WebMethod]
[ScriptMethod(UseHttpGet = false)]
public static void getList(string jsonList)
{
// string: string is not supported for deserialization of an array
// string[]: there is no parameterless constructor for the type string
}

You are just sending IDs so send them as comma-separated string like this:
function sentData() {
var json = [];
$('.btn[value="true"]').each(function () {
var id = $(this).attr("data-seq")
json.push(id);
});
$.ajax({
type: "POST",
async: true,
url: "Default.aspx/getList",
dataType: "json",
data: '{jsonList: "' + json + '" }',
contentType: "application/json; charset=utf-8",
error: function (jqXHR, textStatus, errorThrown) {
console.log('bad, ' + errorThrown + ", " + jqXHR.responseText + ", " + textStatus);
},
success: function(json){
//do something with the result
}
});
return false;
}
And Code-Behind:
[WebMethod]
[ScriptMethod(UseHttpGet = false)]
public static void getList(string jsonList)
{
List<string> ListOfIDs = jsonList.Split(',').ToList();
}

returning complete page HTML instead of string output in JSON response

I am trying to achieve a simplest task through ajax using web method . My web method as follow
[WebMethod]
public static string GetDate()
{
return string.Format("says {0}", DateTime.Now.ToString("r"));
}
and ajax code as follow
$(document).ready(function() {
$("#Result").click(function() {
alert('Result Clicked');
$.ajax(
{
type: "POST",
url: "test1.aspx/GetDate",
data : "{}",
contentType: "application/json",
dataType: "json text",
success: function(rsp) {
alert('success');
alert(rsp);
alert(rsp.d);
$('#Result').append(rsp.d);
},
error: function(rsp) {
alert(rsp.status + " " + rsp.statusText + "</br>" + rsp.responseText);
console.log(rsp);
console.log(rsp.responseText);
}
});
});
});
but status says OK and 200 status code, but instead of simple string in rsp.d its shows complete HTML of that page self.

You Can Try this Code May be it is Help Full.
$("#Result").click(function () {
alert('Result Clicked');
$.ajax(
{
type: "POST",
url: "Default.aspx/GetDate",
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (rsp) {
alert('success');
alert(rsp);
alert(rsp.d);
$('#Result').append(rsp.d);
},
error: function (rsp) {
alert(rsp.status + " " + rsp.statusText + "</br>" + rsp.responseText);
}
});
});

jQuery UI autocomplete error via Web Service/JSON response

I've been trying to get this to work for a few hours now but can't see where I'm going wrong.
I've been checking Firebug for the server response and it retrieves the json data via .asmx web service fine. The only error i have to go off is the one in firebug that's triggered when 2 or more characters are typed in:
TypeError: c.settings[d].call is not a function
jQuery Code Snippet:
$(document).ready(function () {
$("#<%= txtCustomer.ClientID %>").autocomplete({
minLength: 2,
async: true,
source: function(request, response) {
$.ajax({
url: "../Services/AJAXHandler.asmx/GetCustomers",
data: "{'filter':'" + request.term + "'}",
dataType: "json",
type: "POST",
contentType: "application/json; charset=utf-8",
dataFilter: function (data) { return data; },
success: function (data) {
response($.map(data.d, function(item) {
return {
label: item.customerName
};
}));
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
var errorMessage = "Ajax error: " + this.url + " : " + textStatus + " : " + errorThrown + " : " + XMLHttpRequest.statusText + " : " + XMLHttpRequest.status;
if (XMLHttpRequest.status != "0" || errorThrown != "abort")
{
alert(errorMessage);
}
}
});
}
});
If anybody could point me in the right direction that would be brilliant.