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Ajax post doesnt post "&" letter?

I successfully posy via ajax. However, I realized that it doesnt post "&". It also doesnt give any error. Here is my script
Html
<textarea id="aciklamatext">West & Union</textarea>
Ajax post
var aciklama = $('#aciklamatext').val();
$.ajax({
type: "POST",datatype:"json", async: false,
contentType: "application/x-www-form-urlencoded",
url: "/aciklama.php",
data: "aciklama=" + aciklama,
success: function(html){
}
});
aciklama.php
$aciklama = $_POST["aciklama"];
echo $aciklama;
Output
West

The easiest way to send data by ajax is to use JSON. Internal ajax converts the JSON data to a string and encodes all the special chars:
$.ajax({
type: "POST",
datatype:"json",
url: "/aciklama.php",
data: {"aciklama": + $('#aciklamatext').val()},
success: function(data){
}
});
One comment: The use of async false is deprecated. http://api.jquery.com/jquery.ajax/

Post data don't send using jQuery Ajax request

how to send large base64 data Array using jQuery Ajax. Here is my code :
$.ajax({
type: "POST",
url: "addPhoto.php",
data:{photosArray:photosArray},
dataType: "json",
success: function(data) {
$(data).each(function(){
...
});
}
});
photosArray contains between 3 and 12 very long strings like :
data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABQAAAAUCAMAAAC6V+0...
Is there any limit for POST data size in Ajax?

Open your php.ini file and find the line stating upload_max_filesize. The default it set to 2M, which is 2MB. Try increasing it to 3MB and see if you are still receiving the error.
And use
"cache": false

Is your data properly declared ? It can be either String, object or array. try following
$.ajax({
type: "POST",
url: "addPhoto.php",
data:"{photosArray:photosArray}",
dataType: "json",
success: function(data) {
$(data).each(function(){
...
});
}
});

ERROR: bad URI when sending data as JSON with GET method to a Rails resource

Hello I'm performing a GET request on a RESTful Rails resource, like so:
function getGroups(category) {
$.ajax({
type: 'GET',
url: 'http://localhost:3000/groups.json',
data: JSON.stringify({"access_token":"569669d8df0456", "category":category }),
success: function(data) {alert(data)},
contentType: "application/json",
dataType: 'json'
});
});
getGroups("own_groups");
The problem is that Webrick server errors out like this:
ERROR bad URI
`/groups.json?{%22access_token%22:%22569669d8df0456%22,%22category%22:%22own_groups%22}'.
It must be something related with how the JSON data is parsed, because I am having no problems with another GET request WITHOUT JSON data, and a POST request WITH JSON data...
Update: adding code for POST request (where JSON.stringify is required)
function addGroup(name, description) {
$.ajax({
type: 'POST',
url: 'http://localhost:3000/groups.json',
data: JSON.stringify({"access_token":"569669d8df0456", "group_name":name, "group_description":description}),
success: function(data) { alert("ok")},
contentType: "application/json",
dataType: 'json'
});
};
addGroup("nice group", "full of people");

Do not use JSON.stringify. Simply put:
data: {"access_token":"569669d8df0456", "category":category },
Moreover, you do not need to specify complete url http://localhost:3000/groups.json, it can be just simply groups.json

JavaScript array getting encoded when posting jQuery

I'm trying to post part of my Knockout viewmodel to our server using jQuery.Ajax.
When I build the data object it looks fine in the console, but when it gets sent via the jQuery Ajax Post the array within gets encoded. The results on the other end are readable by the server, so it works, but it disturbs me greatly (the payload is bigger for one thing).
Here's the code:
var items = $.map(self.Items(), function (item) {
return item.Key() ? {
Key: item.Key(),
PromoCode: item.PromoCode,
Qty: parseInt(item.Qty(), 10)
} : undefined;
}),
data = {
"InEditMode": true,
"Items": items
};
$.ajax({
url: '/api/order/',
type: 'POST',
data: data,
dataType: "json",
success: function (order) {
<snip>
The result as seen by FireBug is this.
Here's the decoded JSON Object
InEditMode true
Items[0][Key] 2730M0ARAX1111AAAAX0
Items[0][PromoCode]
Items[0][Qty] 3
Items[1][Key] 2730M0ARCX1111AAAAX0
Items[1][PromoCode]
Items[1][Qty] 5
Here's the Raw view
InEditMode=true&
Items%5B0%5D%5BKey%5D=2730M0ARAX1111AAAAX0&
Items%5B0%5D%5BPromoCode%5D=&
Items%5B0%5D%5BQty%5D=3&
Items%5B1%5D%5BKey%5D=2730M0ARCX1111AAAAX0&
Items%5B1%5D%5BPromoCode%5D=&
Items%5B1%5D%5BQty%5D=5

Like #codenoire said in his comment, you aren't specifying the content type. Add contentType: 'application/json; charset=utf-8' to your $.ajax call, like so:
$.ajax({
url: '/api/order/',
type: 'POST',
data: data,
dataType: "json",
contentType: 'application/json; charset=utf-8',
success: function (order) {
<snip>

I think you need to stringify your JSON object before you post it. Use JSON.stringify(data) before you post it.

I was so close! The answer is a combination of rwisch45 and Saeedses
I had already tried adding the contentType before, but that caused it to break and I hadn't pursued it any further then that.
the solution is to add the content type AND JSON.stringify it, as so.
$.ajax({
url: '/api/order/',
type: 'POST',
data: JSON.stringify(data),
dataType: "json",
contentType: 'application/json; charset=utf-8',
success: function (order) {
Thanks all for your help!

Array Initialiser Too Large In ajax Response

I made ajax request for getting byte of data from server using jquery.but when I get response from server at that time I get following error.
array initialiser too large
So is there any way to find out solution.
I have following code.
$.ajax({
type: 'POST',
url: 'test',
contentType: 'application/jsonp',
crossdomain: true,
dataType: "text",
dataType: "jsonp",
success: function (txt) {
}
});