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Handle undefined data in ajax request

I have the below ajax call and sometimes the request stops the page from loading as the data being passed is undefined.
I there a way to put a condition to handle the request if it has values that are undefined?
Can it be wrapped with a if condition?
newuser is not defined
$.ajax(
{
url: 'sample.aspx,
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data){
...
} ,
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
});

Simplest way would be to use a pipe:
$.ajax({url: 'sample.aspx',
data: newuser || {},//continue here...
If your variable was not initialized, empty object will be sent instead.
That's if and only if you can handle empty "newuser" for some reason.
I'm assuming that not closed URL is just a mistake in copy-paste, and not actually part of your code.

how about
if(newuser)
{
$.ajax(
{
url: 'sample.aspx,
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data){
...
} ,
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
});
}

If you are unable to handle an empty newuser you can try something like this:
if (newuser) {
$.ajax({
url: 'sample.aspx',
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data) {
...
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
}

getting data but unable to save it ajax

This is my code for a service
function usersClicked() {
var response;
$.ajax({
url: 'somedomain.com/get_users',
type: 'GET',
dataType: 'jsonp',
crossDomain: true,
contentType: "application/json; charset=utf-8",
success: function (data, status, xhr) {
alert(data);
}
});
}
In network tab, I am able to see the response but it is unable to alert data. No dialog is being shown. can anyone help me with this
Response Header

Calling web service from code behind instead of javascript

I have a javascript code that calls a web service from another server, it's working, but i need to call it from code behind due to an http call request issue, following my code :
$.ajax({
type: "POST",
contentType: "application/json; charset=utf-8",
url: "http://10.8.111.12:7181/CatchEventLink.asmx/CollectDataLink",
data: JSON.stringify({ "pDataDictionnary": lDataCollected }),
dataType: "json",
async: true,
success: function (data, textStatus) {
if (textStatus == "success") {
//alert('success');
}
},
error: function (exception) {
//alert('Exeption : ' + exception);
}
});
Any suggestions please??

Ajax error value return null

I have a function in ajax :
$.ajax({
type: "POST",
url: "#Url.Action("FiltraLevatamento", "Consulta")",
data: JSON.stringify(jsn),
contentType: "application/json",
dataType: "json",
async: true,
success: function (data) {
result(data);
$("#modalboxProcessa").modal("hide");
},
error: function (XMLHttpRequest, txtStatus, errorThrown) {
$("#modalboxProcessa").modal("hide");
$("#modalboxErro2").modal("show");
}
});
In my local machine works properly only when I publish in the server error in ajax .
Can anyone tell me what is the problem ? I have pretty much the same ajax only returning me other than data, and is running fine .

JQuery shortcut for sending ajax/JSON requests

I am working on a application that uses a REST architecture style. Hence, I often do some calls to the backend with JSON data.
jQuery is new to me and up to now, the only syntax that worked for me is :
$.ajax({
url: '/api/something/',
type: 'POST',
contentType:"application/json", //Or I will get 400 : Bad request
data: JSON.stringify({key : "value"}),
success: function (data) {
console.log("data : %o", data);
}
});
But I do not want to write explicitly contentType:"application/json" and JSON.stringify at every call. I would prefer something like :
$.someFunction({
url: '/api/something/',
type: 'POST',
data: {key : "value"},
success: function (data) {
console.log("data : %o", data);
}
});
Maybe I could make a function in order to factorize this but I feel that jQuery should have a pre-existing function for that.
Anyone knows such function?

Just wrap everything in a function and pass the parameters you need.
var thinPostWrapper = function(url, data, success) {
return $.ajax({
url: url
type: 'POST',
contentType: "application/json",
data: JSON.stringify(data),
success: success
});
}
thinPostWrapper('/api/something/', {"key" : "value"}, function(data) {
console.log("data : %o", data);
});

Try extending jQuery:
$.extend({doPost: function(url, data, success, error) {
$.ajax({
url: url,
type: 'POST',
contentType: "application/json",
data: JSON.stringify(data),
success: success,
error: error
});
}
});
$.doPost('/api/something/', {"key" : "value"}, function(data) {
console.log("data : %o", data);
});

Try
$.post(
'api/something',
{ key: 'value' },
function( data ) {
...
},
'json'
);
See http://api.jquery.com/jquery.post/ for more details

Try with $.post
$.ajax({
type: "POST",
url: url,
data: data,
success: success,
dataType: dataType
});