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| <!DOCTYPE html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="UTF-8"> | |
| <title></title> | |
| </head> | |
| <body> | |
| </body> | |
| <script type="text/javascript" src="jsonp.js"></script> | |
| <script> | |
| var addParagraph = function(text) { | |
| var p = document.createElement('p'); | |
| p.textContent = text; | |
| document.body.appendChild(p); | |
| }; | |
| var API_URL = "https://api.flickr.com/services/feeds/photos_public.gne?format=json&jsoncallback=?"; | |
| JSONP.fetch(API_URL, function (res) { | |
| addParagraph(res.title) | |
| res.items.forEach(function (item) { | |
| addParagraph(item.link); | |
| }); | |
| }); | |
| </script> | |
| </html> |
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| var JSONP = function () { | |
| return { | |
| fetch: function (url, cb) { | |
| // Generate a random function name | |
| var cbName = "cb" + Math.floor(Math.random() * 1000); | |
| // Define global callback function | |
| window[cbName] = function(payload) { | |
| // Call the users callback w/ payload | |
| cb(payload); | |
| // Clean up this function when we're done; | |
| delete window[cbName]; | |
| }; | |
| // Replace "callback=?" with actual callback function name | |
| var scriptUrl = url.replace("callback=?", "callback=" + cbName); | |
| // Inject script tag | |
| var scriptElem = document.createElement("script"); | |
| scriptElem.setAttribute('src', scriptUrl); | |
| document.body.appendChild(scriptElem); | |
| } | |
| }; | |
| }(); |
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http://ains.co/blog/things-which-arent-magic-jsonp.html