Jquery Post method and JSON issue

Question

I'm using jquery and jason sending data to another contoller, but when I send the data, I check it in fire bug and it's fine, It sends it correctly but in the target page, when I var_dump the $_REQUEST or $_POST is returns null.

I'm using codeigniter by the way.

This my jquery code:

<script type="text/javascript">
function GetMovieLanguageCategory(Language) 
{
 $.ajax({
  type: "POST",
  contentType: "application/json",
  url: "/admin/movie/get_language_category",
  data: JSON.stringify({"Language":Language}),
  success: function(Data)
  {
    alert(Data);
  },
  failure: function(ErrorMsg) {
  alert(ErrorMsg);
  },
}); 
}
</script>

And in my Controller:

var_dump($_REQUEST);
//var_dump(json_decode($_POST['Language']));

And it returns:

array(0) {}

Am I wrong somewhere?

I don't see anything wrong with your code that would cause the issue you are having. Note however, failure should be error — user400654
– user400654, Commented Dec 20, 2013 at 20:41
Do you have any other scripts like this that accept json strings via post? I wonder if there's some setting or .htaccess entry messing with your requests. — user400654
– user400654, Commented Dec 20, 2013 at 20:43
No, I tried contentType: "application/json" but didn't help! — Masoud Motallebipour
– Masoud Motallebipour, Commented Dec 20, 2013 at 20:47
I'm using codeigniter, Is anything about htaceess in that about jason? — Masoud Motallebipour
– Masoud Motallebipour, Commented Dec 20, 2013 at 20:48
$_REQUEST only gets populated when you send a query string as either POST or GET. You are not doing that. You need to read the raw POST body: $postBody = file_get_contents('php://input'); echo $postBody;. — gen_Eric
– gen_Eric, Commented Dec 20, 2013 at 21:12

Quentin · Accepted Answer · 2013-12-20 20:43:31Z

3

You are sending JSON data, but marking it as application/x-www-form-urlencoded data and you are trying to parse it as application/x-www-form-urlencoded data.

Change:

data: JSON.stringify({"Language":Language}),

to

data:{"Language":Language},

and let jQuery encode it properly for you.

If you want to encode it yourself (don't!):

data: "Language=" + encodeURIComponent(Language);

If you really want to send JSON:

contentType: "application/json",
data: JSON.stringify({"Language":Language}),

then, in the PHP, get the body of the request and run it through json_decode.

answered Dec 20, 2013 at 20:43

Quentin

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7 Comments

user400654 Over a year ago

If that is the issue, using contentType: "application/json" would allow him to access it via $_REQUEST wouldn't it? i was under the impression that jquery would send it in the request body, and php would give you access to it via $_REQUEST

Masoud Motallebipour Over a year ago

But I want to send data Using jason, I'm Using compression and If I don't jason encode it, it won't work

Quentin Over a year ago

@KevinB — No. PHP will never automatically decode JSON requests.

user400654 Over a year ago

no, not auto decode, i expected it to give you the raw json, which it does as you've pointed out, just not in $_REQUEST

Quentin Over a year ago

@MasOud — I've updated the answer with instructions on how to make a JSON request. (Note "JSON" not "jason", it isn't a singer-songwriter who dated Kylie). I don't see how this would make a difference to being able to compress it though.

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