JSON and jQuery not working

Question

Im really getting so frustrated with this jquery, I want o use the getJson for my ajax but its just not working! its driving me nuts.

i have this, got this from an example:

 $.getJSON("../file.php",{filepath:g_filepath, startRow: "0"},dates);

and also this:

 $.ajax({
                type: "GET",
                url: '../file.php',
                data: param,
                async: true,
                beforeSend: function(x) {
                if(x && x.overrideMimeType) {
                x.overrideMimeType("application/j-son;charset=UTF-8");
                }
            },
            dataType: "json",
            success: function(data){
                //do your stuff with the JSON data
                 alert("called");
            }
            });

Both are just not working, its not getting the reponse.

Can somebody help me.

In my php file codes goes something like this:

$myArray =  array();
 while($filehandle->eof) {

  $line = $filehandle->fgets();

  array_push($myArray, $line);
  echo json_encode($myArray);  


}

am I doing it wrongly?

Do not invent MIME-types. `application/json` is the right one. — kapa, Mar 07 '12 at 06:28
The server might return an error? Use Chrome Developer Tools or similar to look at the request/response — jgauffin, Mar 07 '12 at 06:29
there are a good number of things could be wrong..if don't know how to use a browser console to look at request, learn now, the status of request is the first place to start. Also could be a script error and request isn't even happening, again need to look in console — charlietfl, Mar 07 '12 at 06:32
Are you sure the returned JSON is valid? -- [Ajax request return 200 OK but error event is fired instead of success](http://stackoverflow.com/questions/6186770/ajax-request-return-200-ok-but-error-event-is-fired-instead-of-success) — Salman A, Mar 07 '12 at 06:33
It goes to the callback function already but response is returning null. In my php, i have an array and I echo the json_encode(); Im using the firefox/firebug.. and its not returning response data — tinks, Mar 07 '12 at 06:40
Like I said, you must first check if your JSON is valid. The PHP script would produce something like `["line1"]["line2"]["line3"]` which is invalid JSON. — Salman A, Mar 07 '12 at 07:05
but if you use json_encode($array) it should be okay... @Salman A — tinks, Mar 07 '12 at 07:15
`json_encode($array)` will work when it is used the _right_ way. Post the JSON returned by server. — Salman A, Mar 07 '12 at 07:56

score 0 · Answer 1 · answered Mar 07 '12 at 06:27

0

I'd try to avoid giving url a relative pathname. Change that to the full path to your target page. Similarly, ensure that target page actually returns content.

Are you using Chrome or Firefox/Firebug? Enable the Network output and follow the request. Does it make a proper request?

answered Mar 07 '12 at 06:27

Morgon

3,269
1
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It goes to the callback function already but response is returning null. In my php, i have an array and I echo the json_encode(); Im using the firefox/firebug.. and its not returning response data – tinks Mar 07 '12 at 06:39
does php file print when open it in browser? – charlietfl Mar 07 '12 at 06:56
tried using it like this http://stackoverflow.com/questions/9513377/onreadystatechange-in-ajax-not-working and just made it to responseText.. i can get a response.. but when i use jquery its just not returning – tinks Mar 07 '12 at 07:07
But you mentioned that your target PHP file didn't output when called directly. That sounds like an issue with your target file rather than jQuery. – Morgon Mar 07 '12 at 13:21

score 0 · Answer 2 · answered Mar 07 '12 at 06:51

With these sort of problems work incrementally.

First test the service directly from a browser.

Once you've got a URL that works in the browser then put it into your JQuery.

Indeed I usually start by mocking up the service by creating a JSON text file and serving it from a web server, see that in the browser, then get my JavaScript going and finally write the service.

score 0 · Answer 3 · answered Mar 07 '12 at 06:56

php should return just one json object not many.. you returning json in each while loop call

WRONG:

$myArray =  array();
 while($filehandle->eof) {

  $line = $filehandle->fgets();

  array_push($myArray, $line);
  echo json_encode($myArray);  


}

SHOULD WORK:

$myArray =  array();
 while($filehandle->eof) {

  $line = $filehandle->fgets();

  array_push($myArray, $line);
}
echo json_encode($myArray);

also consider firebug or other javascript debug tool for testing further errors

I don't see how could you get null.. you should get `[]` at least. debug your php code — Vytautas, Mar 07 '12 at 07:53

JSON and jQuery not working

3 Answers3