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(function(){ | |
var states = {}; | |
var readyCallback = null; | |
function checkReadyState(){ | |
var allReady = Object.keys(states).every(function(src){ | |
return states[src] === 2; | |
}); | |
if (allReady){ | |
states= {}; | |
readyCallback(); | |
readyCallback = null; | |
} | |
} | |
/** | |
* loads a css resource | |
*/ | |
function loadCss(src){ | |
states[src] = 2; | |
var link = document.createElement("link"); | |
link.rel = "stylesheet"; | |
link.type = "text/css"; | |
link.href = src; | |
link.dataset.moduler = "true"; | |
checkReadyState(); | |
document.head.appendChild(link); | |
} | |
/** | |
* Loads a javascript resource | |
*/ | |
function loadScript(src){ | |
states[src] = 1; | |
var script = document.createElement('script'); | |
script.type = 'text/javascript'; | |
script.src = src; | |
script.dataset.moduler = "true"; | |
//Wheter it loads or fails, set the state to ready | |
//And trigger the listeners | |
script.onload = function(){ | |
states[src] = 2; | |
checkReadyState(); | |
}; | |
script.onerror = script.onload; | |
document.head.appendChild(script); | |
} | |
function scriptExistsInDom(src){ | |
return !!document.querySelector('script[src=' + JSON.stringify(src) + ']:not([data-moduler="true"])'); | |
} | |
function cssExistsInDom(src){ | |
return !!document.querySelector('link[src=' + JSON.stringify(src) + ']:not([data-moduler="true"])'); | |
} | |
/** | |
* Loads a specific source and triggers a callback when it's loaded | |
* or just triggers the callback if it's already loaded | |
*/ | |
function load(src){ | |
var isCss = (src.indexOf(".css", src.length - 4) !== -1); | |
var existsInDom = (isCss ? cssExistsInDom : scriptExistsInDom)(src); | |
if (states[src]){ | |
return; | |
} else if (existsInDom){ | |
states[src] = 2; | |
checkReadyState(); | |
return; | |
} | |
//try to load it | |
if (isCss) { | |
loadCss(src); | |
} else { | |
loadScript(src); | |
} | |
} | |
/** | |
* create a module, requeriments is an array | |
*/ | |
window.module = function(requeriments, callback){ | |
if (requeriments instanceof Function){ | |
requeriments(); | |
return; | |
} | |
requeriments.forEach(function(src){ | |
states[src] = 0; | |
load(src); | |
}); | |
callback(); | |
} | |
/** | |
* wait until everything is loaded to trigger | |
*/ | |
window.loadModules = function(requeriments, callback){ | |
requeriments.forEach(function(src){ | |
states[src] = 0; | |
load(src); | |
}); | |
readyCallback = callback; | |
} | |
})(); |
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