Created
December 17, 2013 02:37
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load javascript or css file
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function loadFile (url, callback) { | |
var head = document.getElementsByTagName("head")[0] || document.documentElement | |
var baseElement = head.getElementsByTagName("base")[0] | |
var IS_CSS_RE = /\.css(?:\?|$)/i | |
var currentlyAddingScript | |
var interactiveScript | |
var isOldWebKit = +navigator.userAgent | |
.replace(/.*AppleWebKit\/(\d+)\..*/, "$1") < 536 | |
function request(url, callback) { | |
var isCSS = IS_CSS_RE.test(url) | |
var node = document.createElement(isCSS ? "link" : "script") | |
addOnload(node, callback, isCSS, url) | |
if (isCSS) { | |
node.rel = "stylesheet" | |
node.href = url | |
} else { | |
node.async = true | |
node.src = url | |
} | |
currentlyAddingScript = node | |
baseElement ? | |
head.insertBefore(node, baseElement) : | |
head.appendChild(node) | |
currentlyAddingScript = null | |
} | |
function addOnload(node, callback, isCSS, url) { | |
var supportOnload = "onload" in node | |
if (isCSS && (isOldWebKit || !supportOnload)) { | |
setTimeout(function() { | |
pollCss(node, callback) | |
}, 1) | |
return | |
} | |
if (supportOnload) { | |
node.onload = onload | |
node.onerror = function() { | |
onload() | |
} | |
} | |
else { | |
node.onreadystatechange = function() { | |
if (/loaded|complete/.test(node.readyState)) { | |
onload() | |
} | |
} | |
} | |
function onload() { | |
node.onload = node.onerror = node.onreadystatechange = null | |
if (!isCSS) { | |
head.removeChild(node) | |
} | |
node = null | |
callback() | |
} | |
} | |
function pollCss(node, callback) { | |
var sheet = node.sheet | |
var isLoaded | |
if (isOldWebKit) { | |
if (sheet) { | |
isLoaded = true | |
} | |
} else if (sheet) { | |
try { | |
if (sheet.cssRules) { | |
isLoaded = true | |
} | |
} catch (ex) { | |
if (ex.name === "NS_ERROR_DOM_SECURITY_ERR") { | |
isLoaded = true | |
} | |
} | |
} | |
setTimeout(function() { | |
if (isLoaded) { | |
callback() | |
} | |
else { | |
pollCss(node, callback) | |
} | |
}, 20) | |
} | |
function getCurrentScript() { | |
if (currentlyAddingScript) { | |
return currentlyAddingScript | |
} | |
if (interactiveScript && interactiveScript.readyState === "interactive") { | |
return interactiveScript | |
} | |
var scripts = head.getElementsByTagName("script") | |
for (var i = scripts.length - 1; i >= 0; i--) { | |
var script = scripts[i] | |
if (script.readyState === "interactive") { | |
interactiveScript = script | |
return interactiveScript | |
} | |
} | |
} | |
request(url, callback) | |
} |
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