Created
July 17, 2011 19:44
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Render Handlebars templates from a server-side resource with caching to session storage
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/* | |
* This decorates Handlebars.js with the ability to load | |
* templates from an external source, with light caching. | |
* | |
* To render a template, pass a closure that will receive the | |
* template as a function parameter, eg, | |
* T.render('template-name', function(t) { | |
* $('#somediv').html( t() ); | |
* }); | |
*/ | |
var Template = function() { | |
this.cached = {}; | |
this.hasSessionStorage = !!window.sessionStorage; | |
}; | |
var T = new Template(); | |
$.extend(Template.prototype, { | |
render: function(name, callback) { | |
if (T.isCached(name)) { | |
callback(T.getFromCache(name)); | |
} else { | |
$.get(T.urlFor(name), function(raw) { | |
T.store(name, raw); | |
T.render(name, callback); | |
}); | |
} | |
}, | |
renderSync: function(name, callback) { | |
if (!T.isCached(name)) { | |
T.fetch(name); | |
} | |
T.render(name, callback); | |
}, | |
prefetch: function(name) { | |
if (!T.isCached) { | |
$.get(T.urlFor(name), function(raw) { | |
T.store(name, raw); | |
}); | |
} | |
}, | |
fetch: function(name) { | |
// synchronous, for those times when you need it. | |
if (! T.isCached(name)) { | |
var raw = $.ajax({'url': T.urlFor(name), 'async': false}).responseText; | |
T.store(name, raw); | |
} | |
}, | |
getFromCache: function(name) { | |
if (T.hasSessionStorage) { | |
var cached = window.sessionStorage.getItem("template-" + name); | |
if (!!cached) { | |
return Handlebars.compile(cached); | |
} else { | |
return cached; | |
} | |
} else { | |
return T.cached[name]; | |
} | |
}, | |
isCached: function(name) { | |
return !!this.getFromCache(name); | |
}, | |
store: function(name, raw) { | |
if (T.hasSessionStorage) { | |
window.sessionStorage.setItem("template-" + name, raw); | |
} else { | |
T.cached[name] = Handlebars.compile(raw); | |
} | |
}, | |
urlFor: function(name) { | |
return "/resources/templates/"+ name + ".handlebars"; | |
} | |
}); |
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