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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) {
}
});
}

Ajax call to database not works

in my application I have to make an ajax call to php file.it works proper in all devices. but when I tried it on ipad mini it not calls the php, so that the functionality not works, I've seen so many question about this problem and edited my code like this.
jQuery.ajax({
type: "POST",
async: true,
cache: false,
url: "directory/phpfile.php",
data: data,
success: function(response) {
}
});
my old code is
jQuery.ajax({
type: "POST",
url: "wp-admin/admin-ajax.php",
data: data,
success: function(response) {
}
});
and the problem still cant resolve . so please any one tell me how to resolve this.

Please use this code
$("#ajaxform").submit(function(e)
{
var postData = $(this).serializeArray();
var formURL = $(this).attr("action");
$.ajax(
{
url : formURL,
type: "POST",
data : postData,
success:function(data, textStatus, jqXHR)
{
//data: return data from server
},
error: function(jqXHR, textStatus, errorThrown)
{
//if fails
}
});
e.preventDefault(); //STOP default action
e.unbind(); //unbind. to stop multiple form submit.
});
$("#ajaxform").submit(); //Submit the FORM

<script type='text/javascript'>
$(document).ready(function startAjax() {
$.ajax({
type: "POST",
url: "test.php",
data: "name=name&location=location",
success: function(msg){
alert( "Data Saved: " + msg );
}
});
});

AJAX success call back not working

Here is the code I am using to access my web API controller named Owner; the success function is not being called. Any ideas?
$.ajax({
type: "GET",
url: 'http://localhost:26533/api/Owner',
contentType: "application/json",
dataType: "jsonp",
success: function (response) { alert("yes"); }
});

Remove the contentType and dataType and check the response..
Here an example:
$.ajax({
type: 'GET',
url: 'http://localhost:26533/api/Owner',
success: function(data){
alert(data);
},
error: function(xhr, type, exception) {
// if ajax fails display error alert
alert("ajax error response type " + type);
}
});
With this you can see what's wrong...

Jquery ajax post request not working

I have a simple form submission with ajax, but it keeps giving me an error. All the error says is "error". No code, no description. No nothing, when I alert it when it fails.
Javascript with jQuery:
$(document).ready(function(){
$(".post-input").submit(function(){
var postcontent = $(".post-form").val();
if (postcontent == ""){
return false;
}
$(".post-form").attr("disabled", "disabled");
$.ajax({
url: '/post',
type: 'POST',
data: {"post-form": postcontent},
dataType: json,
success: function(response, textStatus, jqXHR) {
alert("Yay!");
},
error: function(jqXHR, textStatus, errorThrown){
alert(textStatus, errorThrown);
}
});
});
});
HTML:
<form class="post-input" action="" method="post" accept-charset="utf-8">
<textarea class="post-form" name="post-form" rows="1" cols="10" onFocus="this.value='';return false;">What are you thinking about...</textarea>
<p><input class="post-submit" type="submit" name = "post.submitted" value="Post"></p>
</form>
and if there are no problems there, then the server-side (pyramid):
def post(request):
session = Session()
user = authenticated_userid(request)
postContent = request.POST['post-form']
if not postContent == '':
session.add(Activity(user.user_id, 0, postContent, None, None))
return {}
return HTTPNotFound()
UPDATE:
After some more debugging with firebug, I discovered that the post request body contains only post.submitted=Post, instead of the intended result of {"post-form": postcontent}.

According to jQuery documentation, you must declare the data type:
$.ajax({
type: 'POST',
url: url,
data: data,
success: success,
dataType: dataType
});
Also, looking at your server-side code, you don't actually want to post JSON formatted data. This {"post-form":postcontent} is JSON formatted data. What you actually want to do is send TEXT or HTML. Seeming as it's form data, I would guess at TEXT.
Try this:
$.ajax({
url: '/post',
type: 'POST',
data: 'post-form='+postcontent,
dataType: 'text',
success: function(response, textStatus, jqXHR) {
alert("Yay!");
},
error: function(jqXHR, textStatus, errorThrown){
alert(textStatus, errorThrown);
}
});

Since you are posting JSON-data you have to declare the dataType "JSON":
$.ajax({
url: '/post',
type: 'POST',
dataType: "json",
data: {"post-form": postcontent},
success: function(response, textStatus, jqXHR) {
alert("Yay!");
},
error: function(jqXHR, textStatus, errorThrown){
alert(textStatus, errorThrown);
}
});

I think the problem is that the data that you are passing is not properly written.
Try to change this:
data: {"post-form": postcontent},
To this:
data: 'post-form='+ $('.post-form').val(),

Receive serialized in php data by using ajax

I have a php script, which return serialized in php data. And I try to receive this data by using $.ajax() method from jQuery 1.7. Here is the example.
$.ajax({
url: 'http://input.name/get.php?do=lookup' + '&domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
type: 'GET',
dataType: 'text',
cache: 'false',
complete: function(res) {
alert('COMPLETE() done');
console.log(res);
}
});
In console I see only
Object { readyState=0, status=0, statusText="error"}
So, what I do wrong? Could you help me please?
UPD
Interesting notice: if I use JSONP dataType request can receive data, but can't process it.
Here is an example.
$.ajax({
url: 'http://input.name/get.php?do=lookup',
data: 'domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
dataType: 'jsonp',
cache: false,
success: function(data) {
alert("Data: "+data);
},
error: function(jqXHR, textStatus, errorThrown) {
alert("Error: "+textStatus);
console.log(jqXHR);
}
});

Instead of complete: use success: then res will be the returned data from your ajax request.
Remember to use error: as well incase there is an error with you call, as it seems that there might be in your console output.
Code:
$.ajax({
url: 'http://input.name/get.php?do=lookup',
data: 'domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
cache: false,
success: function(data) {
alert("Data: "+data);
},
error: function(jqXHR, textStatus, errorThrown) {
alert("Error: "+textStatus);
console.log(jqXHR);
}
});

Your code is probably fine, but you're trying to violate the same origin policy. Basically, if your site is http://aaa.com/, you cannot make AJAX called to http://bbb.com/.
There are a few ways around it:
Getting around same origin policy in javascript without server side scripts
But most of them require that both sides play nice.

The response is the second parameter of complete function:
$.ajax({
url: 'http://input.name/get.php?do=lookup' + '&domain=twittorama&tlds=.ru,.com,.net,.comf.ru',
type: 'GET',
dataType: 'text',
cache: 'false',
complete: function(res,response) {
alert('COMPLETE() done');
console.log(response);
}
});
More info: http://api.jquery.com/jQuery.ajax/
You should also consider using JSON, not php serialized data