Created
October 11, 2010 11:53
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| <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> | |
| <html> | |
| <head> | |
| <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> | |
| <title></title> | |
| <link rel="stylesheet" type="text/css" href="http://yui.yahooapis.com/combo?2.8.0/build/reset-fonts-grids/reset-fonts-grids.css&2.8.0/build/base/base-min.css"> | |
| </head> | |
| <body class="yui-skin-sam"> | |
| <div id="doc" class="yui-t7"> | |
| <div id="hd" role="banner"> | |
| <h1></h1> | |
| </div> | |
| <div id="bd" role="main"> | |
| </div> | |
| <div id="ft" role="contentinfo"> | |
| <p></p> | |
| </div> | |
| </div> | |
| <script type="text/javascript" charset="utf-8"> | |
| yqlcache = function(){ | |
| /* globals for JSON callback, check for cache support */ | |
| var cacheid,cb, | |
| cancache = (('localStorage' in window) && | |
| window['localStorage'] !== null); | |
| /* get the data - expects a transaction object */ | |
| function get(transaction){ | |
| if(!transaction.id || !transaction.callback || | |
| !transaction.yql || !transaction.cacheage){ return } | |
| var current,data; | |
| cb = transaction.callback; | |
| cacheid = transaction.id; | |
| /* if caching is not supported, just call YQL */ | |
| if(!cancache){ | |
| loadYQL(transaction.yql); | |
| } | |
| /* if caching is supported */ | |
| if(cancache){ | |
| /* retrieve the cache and see if it has data */ | |
| current = JSON.parse(localStorage[cacheid]); | |
| if(current !== null){ | |
| /* if the cache time is less than the cacheage return it*/ | |
| if((new Date().getTime() - current.time) < transaction.cacheage){ | |
| cb({type:'cached',data:current.data}); | |
| /* if the cache is older than the max age, prime the cache */ | |
| } else { | |
| loadYQL(transaction.yql); | |
| } | |
| /* if the cache has no data, load from YQL again */ | |
| } else { | |
| loadYQL(transaction.yql); | |
| } | |
| } | |
| } | |
| /* bog standard JSON-P call function to get data from YQL */ | |
| function loadYQL(yql){ | |
| var old = document.getElementById('yqloadscript'); | |
| if(old){ old.parentNode.removeChild(old); } | |
| var YQL = 'http://query.yahooapis.com/v1/public/yql?q='+ | |
| encodeURIComponent(yql)+'&diagnostics=false&format=json'+ | |
| '&callback=yqlcache.cache'; | |
| var s = document.createElement('script'); | |
| s.setAttribute('type','text/javascript'); | |
| s.id = 'yqloadscript'; | |
| s.setAttribute('src',YQL); | |
| document.getElementsByTagName('head')[0].appendChild(s); | |
| } | |
| /* Caching function */ | |
| function cache(data){ | |
| var out; | |
| /* if YQL was successful, get the data */ | |
| if(data.query && data.query.results){ | |
| var out = data.query.results; | |
| /* if caching is supported, get a timestamp, prime the cache | |
| and call the callback */ | |
| if(cancache){ | |
| var timestamp = new Date().getTime(); | |
| localStorage[cacheid] = JSON.stringify({time:timestamp,data:out}); | |
| cb({type:'freshcache',data:out}); | |
| /* otherwise just call the callback */ | |
| } else { | |
| cb({type:'live',data:out}); | |
| } | |
| } | |
| } | |
| return{cache:cache,get:get}; | |
| }(); | |
| yqlcache.get({ | |
| yql:'desc search.web', | |
| id:'foo', | |
| cacheage:(60*1000), | |
| callback:function(data){console.log(data)} | |
| }); | |
| </script> | |
| </body> | |
| </html> |
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