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2011-07-29T21:35:39.553
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<p><strong>JSONP</strong> is really a simply trick to overcome <strong>XMLHttpRequest</strong> same domain policy. (As you know one cannot send <strong>AJAX (XMLHttpRequest)</strong> request to a different domain.)</p> <p>So - instead of using <strong>XMLHttpRequest</strong> we have to use <strong>script</strong> HTMLl tags, the ones you usually use to load JS files, in order for JS to get data from another domain. Sounds weird?</p> <p>Thing is - turns out <strong>script</strong> tags can be used in a fashion similar to <strong>XMLHttpRequest</strong>! Check this out:</p> <pre><code>script = document.createElement("script"); script.type = "text/javascript"; script.src = "http://www.someWebApiServer.com/some-data"; </code></pre> <p>You will end up with a <strong>script</strong> segment that looks like this after it loads the data:</p> <pre><code><script> {['some string 1', 'some data', 'whatever data']} </script> </code></pre> <p>However this is a bit inconvenient, because we have to fetch this array from <strong>script</strong> tag. So <strong>JSONP</strong> creators decided that this will work better (and it is):</p> <pre><code>script = document.createElement("script"); script.type = "text/javascript"; script.src = "http://www.someWebApiServer.com/some-data?callback=my_callback"; </code></pre> <p>Notice <em>my_callback</em> function over there? So - when <strong>JSONP</strong> server receives your request and finds callback parameter - instead of returning plain JS array it'll return this:</p> <pre><code>my_callback({['some string 1', 'some data', 'whatever data']}); </code></pre> <p>See where the profit is: now we get automatic callback (<em>my_callback</em>) that'll be triggered once we get the data. That's all there is to know about <strong>JSONP</strong>: it's a callback and script tags.</p> <hr> <p><strong>NOTE:<br> These are simple examples of JSONP usage, these are not production ready scripts.</strong></p> <p><strong>RAW JavaScript demonstration (simple Twitter feed using JSONP):</strong></p> <pre><code><html> <head> </head> <body> <div id = 'twitterFeed'></div> <script> function myCallback(dataWeGotViaJsonp){ var text = ''; var len = dataWeGotViaJsonp.length; for(var i=0;i<len;i++){ twitterEntry = dataWeGotViaJsonp[i]; text += '<p><img src = "' + twitterEntry.user.profile_image_url_https +'"/>' + twitterEntry['text'] + '</p>' } document.getElementById('twitterFeed').innerHTML = text; } </script> <script type="text/javascript" src="http://twitter.com/status/user_timeline/padraicb.json?count=10&callback=myCallback"></script> </body> </html> </code></pre> <p><br> <strong>Basic jQuery example (simple Twitter feed using JSONP):</strong></p> <pre><code><html> <head> <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.6.2/jquery.min.js"></script> <script> $(document).ready(function(){ $.ajax({ url: 'http://twitter.com/status/user_timeline/padraicb.json?count=10', dataType: 'jsonp', success: function(dataWeGotViaJsonp){ var text = ''; var len = dataWeGotViaJsonp.length; for(var i=0;i<len;i++){ twitterEntry = dataWeGotViaJsonp[i]; text += '<p><img src = "' + twitterEntry.user.profile_image_url_https +'"/>' + twitterEntry['text'] + '</p>' } $('#twitterFeed').html(text); } }); }) </script> </head> <body> <div id = 'twitterFeed'></div> </body> </html> </code></pre> <p><br> <strong>JSONP</strong> stands for <strong>JSON with Padding</strong>. (very poorly named technique as it really has nothing to do with what most people would think of as “padding”.)</p>
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