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How to get the data value during Jquery Ajax calling?

I'm calling Ajax like below
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: path,
dataType: "json",
data: '{ "jsondata":' + jsondata + ',"key":"' + getValue('id') + '"}',
success: function (data) {
callback(data);
},
error: function (error) {
callback(error.responseText);
}
});
I want to get the "Data" value at calling time because after the call the execution doesn't goes to the desired web method and the error is showing like
""Message":"Invalid web service call, missing value for parameter: \u0027obj\u0027..."
I have to track the the Ajax posting value during Ajax call and find out what is the problem with posting data.Is there any tricks to get the data value before Ajax calling?
Any help will be appreciated.
Edit: I'm sending the jsondata value like below
var jsondata = '{ "pagenumber":"' + pagenumber + '","sortColumn":"' + sortColumn + '","sortDirection":"' + sortDirection + '","rowPerPage":"' + rowPerPage + '"}';
Thanks.

I was just checking with below code -
please have a look. please check beforesend content
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: '/dummy',
dataType: "json",
data: '{dummy:"dummy"}',
success: function (data) {
alert(data);
},
error: function (error) {
alert(error);
},
beforeSend: function(data,data1) {
console.log('before'+data1.data)
},
});
})
});

var path = "test_ajax.php";
var jsondata = "Testing123";
var test = "test";
var data = {jsondata : jsondata,key : test};
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: path,
dataType: "json",
data: data,
success: function (data) {
alert("success:"+data);
},
error: function (error) {
alert("failure"+error.responseText);
}
});

how to get the json string in a variable

i got my json string inside the ajax as function like this way
$.ajax({
type: "POST",
url: "http://localhost/./Service/GetPageInfo",
dataType: "json",
contentType: 'application/json',
data: JSON.stringify({
filename: filename
}),
success: function (data) {
alert('Success');
},
error: function () {
alert('Error');
}
});
here i get data like
[{"main":{"sub":[],"tittle":"manu","startvalue":"","stopvalue":"","status":"","accumalated":"","comment":""}}]
i want it in a variable like
var myjsonobject =[{"main":{"sub":[],"tittle":"manu","startvalue":"","stopvalue":"","status":"","accumalated":"","comment":""}}]

There you go :
$.ajax({
type: "POST",
url: "http://localhost/./Service/GetPageInfo",
dataType: "json",
contentType: 'application/json',
data: JSON.stringify({
filename: filename
}),
success: function (data) {
alert('Success');
var jsonobject = data;
},
error: function () {
alert('Error');
}
});
Also I strongly advise you to use promises to make API calls: https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Promise

var jsonobject= null;
$.ajax({
type: "POST",
url: "http://localhost/./Service/GetPageInfo",
dataType: "json",
contentType: 'application/json',
data: JSON.stringify({
filename: filename
}),
success: function (data) {
jsonobject=data;
alert('Success');
},
error: function () {
alert('Error');
}
});
If you want wait for ajax response and fill up variable then pass async: false in ajax request options.

Based on your comment, you need to parse the JSON in your success handler,
success: function (data) {
alert('Success');
var myjsonobject = JSON.parse( data );
},

Retrieve POST JSON response

I'm writing my first Ajax request, on a Groovy/Grails platform.
var newDataB = $.ajax({
method:'post',
url: url,
async: false,
data: {source:"${source}"},
success: function (response) {
jsonData = response;
var res = JSON.parse(jsonData);
alert(res);//
}
});
Here is the response of my controller "url"
def result = [ value: 'ok' ]
render result as JSON
But it does not work and i get an error message in my browser
SyntaxError: JSON.parse: unexpected character at line 1 column 2 of the JSON data
var res = JSON.parse(jsonData);
I don't understand , the response seems to be a nice formatted JSON ?
EDIT i did a print as Paul suggests :
If i execute
var newDataB = $.ajax({
method:'post',
url: url,
async: false,
dataType: 'json',
data: {source:"${source}"},
success: function (response) {
console.log(response)
console.log(response.value)
jsonData = response;
}
});
The first print is :
Object { value="ok"}
The second print is
ok
If i want to get the result, how is the proper way ?
Do i have to assign the value inside the statement "success: function (response) { "
doing something like
var result
var newDataB = $.ajax({
method:'post',
url: url,
async: false,
dataType: 'json',
data: {source:"${source}"},
success: function (response) {
result = response.value
}
});
console.log("result : "+result);
This code works for me !!
Or perhaps there is a way to get the result, doing something like
var newDataB = $.ajax({
method:'post',
url: url,
async: false,
dataType: 'json',
data: {source:"${source}"},
success: function (response) {
}
});
var result = newDataB.response.somethingblablabla
or
var result = OneFunction(newDataB.response)
??????

You can make object stringified before passing it to parse function by simply using JSON.stringify().
var newDataB = $.ajax({
method: 'post',
url: "${createLink(controller: 'util',action: 'test')}",
async: false,
data: {source: "abc"},
success: function (response) {
jsonData = response;
var res = JSON.parse(JSON.stringify(jsonData));
console.log(res);//
}
});
Hopefully this may help.

You shouldn't need to parse it, if your server is providing json.
You can use dataType though to force jQuery to use a particular type:
var newDataB = $.ajax({
method:'post',
url: url,
async: false,
dataType: 'json',
data: {source:"${source}"},
success: function (response) {
console.log(response);
}
});

Not able to fetch data/Response on Success of Jquery.Ajax()

Hi people, I am craving myself from past 3 days and I just couldn't find the way to access json response seen on my browser
Here is my Ajax code :
$("[id*=btnModalPopup]").live("click", function () {
$("#tblCustomers tbody tr").remove();
$.ajax({
type: "POST",
url: "CallDataThroughJquery.aspx/GetLeadDetails",
data: '{}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (data) {
alert("Hi Json");
alert(data.Leadno); // **Says data.leadno is undefined**
response($.map(data.d, function (item) { // **here I am going some where wrong**
//**cannot catch response. Help!**
}))
},
failure: function (response) {
alert(response.d);
}
});
});
Please help me on this.. Thanks in Advance!

I see that your JSON is an array with an object. Try data[0].Leadno

$.ajax({
type: "POST",
url: "CallDataThroughJquery.aspx/GetLeadDetails",
data: '{}',
contentType: "application/json; charset=utf-8",
dataType: "json",
success: function (data) {
alert("Hi Json");
alert(data.d[0]['Leadno']); // **Says data.leadno is undefined**
response($.map(data.d, function (item) { // **here I am going some where wrong**
//**cannot catch response. Help!**
}))
},
failure: function (response) {
alert(response.d);
}
});
Try your alert with 'data.d[0]['Leadno']'.

JQuery: 'Uncaught TypeError: Illegal invocation' build JSON

My Code is below. I am trying to build a json to pass a url which accept json string as
{
"Item":{
"Id":"e2b249d1",
"Name":"aaaa"
},
"Status":1
}
my function :
var AddEditItem = function (itemid, itemname, status) {
var itemdata = {
"item": {
"Id": itemid,
"Name": itemname
},
"Status": status
};
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: url,
data: itemdata,
dataType: "json",
success: function(response) {},
error: function(response) {}
});
};
I got error
JQuery: 'Uncaught TypeError: Illegal invocation'
Any help?

you should serialize that object before sending to ajax
use JSON.stringify() for that
itemdata= JSON.stringify(itemdata);
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: url,
data: itemdata,
dataType: "json",
success: function(response) {},
error: function(response) {}
});