Problems Encountered with Basic JSON-P Example

I am currently working on a mobile app project that involves fetching JSON data from a MySQL database using PHP. This is a new venture for me, so I started with a basic example to test things out. Everything works fine when the data is on the same domain, but I am encountering issues with JSON-P when trying to fetch data from a different domain. Here is the code that works on the same domain:

<html>
<head>
<title>the title</title>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
<script type="text/javascript" language="javascript">
$(document).ready(function() {
  $.getJSON('example.json', function(staff) {
         document.write(staff.name);
      });
});

</script>

</head>
<body>
</body>
</html>

While this code works well, I am facing challenges when I try to move the 'example.json' file to a different domain for testing. I tried adding '?callback=?' to the URL as recommended in some tutorials, but it still doesn't load anything. I modified the line to:

$.getJSON('http://www.knoxyouthgroup.org/example.json?callback=?', function(staff) {

I am unsure about the next steps to take and feel a bit stuck. Apologies for the newbie question, but any guidance would be greatly appreciated!

Our ultimate aim is to create a mobile app that fetches JSON data from a server. The data will be basic and minimal. Is it feasible to host this data on your own? I have read about REST services, but I am not sure if I can simply write a PHP script to generate JSON data. Any insights would be helpful!

Thank you for your assistance!

Answer №1

JSONP operates in a unique manner compared to regular JSON. Both the client and the service must follow specific guidelines in order for JSONP to function correctly:

  1. Client: When using JQuery.getJSON, you must include "callback=?" to notify JQuery that a JSONP request is being made. Refer to http://api.jquery.com/jQuery.getJSON/ for more information.

  2. Service: The service must handle JSONP requests appropriately by encapsulating the JSON response within the callback function. The response should be formatted as:

      <callback-function> ( <JSON-payload> )
    

For example, callback({name:"JONES",position: "Officer"})

If the service fails to comply with these requirements, the client will fail without generating an error message.

It is possible that your service is not JSONP-compliant. Consider modifying it to accommodate both local (JSON) and remote (JSONP) requests.

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