'use strict';
/*@
Ox.get <f> Get a remote file
(url, callback) -> <u> undefined
url <s> Remote URL
callback <f> Callback function
data <s> The contents of the remote resource
error <o|null> Error, or null
code <n> Status code
text <s> Status text
@*/
Ox.get = function(url, callback) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.onreadystatechange = function() {
if (request.readyState == 4) {
if (request.status == 200) {
callback(request.responseText, null);
} else {
callback(null, {
code: request.status,
text: request.statusText
});
}
}
};
request.send();
};
/*@
Ox.getAsync <f> Runs an asynchonous loader for an array of URLs
(urls, get, callback) -> <u> undefined
urls <s|a> URL or array of either URLs or arrays of URLs
Multiple URLs in the same array will be processed simultaneously, but
multiple arrays of URLs will be processed in that order.
get <f> Asynchronous function that loads a URL (for example Ox.get)
url <s> URL
callback <f> Callback function
result <s> Result
error <o|null> Error, or null
code <n> Status code
text <s> Status text
callback <f> Callback function
results <o> Results
Keys are file names, values are results
errors <o|null> Errors, or null
Keys are file names, values are error objects
@*/
Ox.getAsync = function(urls, get, callback) {
urls = Ox.clone(Ox.makeArray(urls));
var errors = {}, i = 0, n = urls.length, results = {};
function done() {
callback(
n == 1 ? results[urls[0]] : results,
n == 1 ? errors[urls[0]] : Ox.some(errors, function(error) {
return error !== null;
}) ? errors : null
);
}
function iterate() {
var url = urls.shift();
Ox.getAsync(url, function(result, error) {
Ox.extend(results, url, result);
Ox.extend(errors, url, error);
urls.length ? iterate() : done();
});
}
if (urls.some(Ox.isArray)) {
iterate();
} else {
urls.forEach(function(url) {
get(url, function(result, error) {
Ox.extend(results, url, result);
Ox.extend(errors, url, error);
++i == n && done();
});
});
}
};
/*@
Ox.getFile <f> Loads a file (image, script or stylesheet)
(file="script.js", callback) -> <u> undefined
(file="stylesheet.css", callback) -> <u> undefined
(file="image.png", callback) -> <u> undefined
file <s> Local path or remote URL
callback <f> Callback function
image <h> DOM element (if the file is an image)
@*/
// FIXME: this doesn't handle errors yet
Ox.getFile = (function() {
var cache = {};
function getFile(file, callback) {
var element,
head = document.head
|| document.getElementsByTagName('head')[0]
|| document.documentElement,
request,
type = file.split('.').pop(),
isImage = type != 'css' && type != 'js';
if (!cache[file]) {
if (isImage) {
element = new Image();
element.onload = addFileToCache;
element.src = file;
} else {
if (!findFileInHead()) {
element = document.createElement(
type == 'css' ? 'link' : 'script'
);
element[
type == 'css' ? 'href' : 'src'
] = file + '?' + Ox.random(1000000);
element.type = type == 'css' ? 'text/css' : 'text/javascript';
if (type == 'css') {
element.rel = 'stylesheet';
}
if (/MSIE/.test(navigator.userAgent)) {
// fixme: find a way to check
// if css/js have loaded in msie
setTimeout(addFileToCache, 2500);
} else {
if (type == 'css') {
waitForCSS();
} else {
element.onload = addFileToCache;
}
}
head.appendChild(element);
} else {
addFileToCache();
}
}
} else {
callback();
}
function addFileToCache() {
if (isImage) {
// for an image, save the element itself,
// so that it remains in the browser cache
cache[file] = element;
callback(element);
} else {
cache[file] = true;
callback();
}
}
function findFileInHead() {
return Ox.toArray(
document.getElementsByTagName(type == 'css' ? 'link' : 'script')
).map(function(element) {
return element[type == 'css' ? 'href' : 'src'] == file;
}).reduce(function(prev, curr) {
return prev || curr;
}, false);
}
function waitForCSS() {
var error = false;
try {
element.sheet.cssRule;
} catch (e) {
error = true;
setTimeout(function() {
waitForCSS();
}, 25);
}
!error && addFileToCache();
}
};
return function(files, callback) {
Ox.getAsync(files, function(file, callback) {
getFile(file, function(images) {
callback(images ? {file: images} : {});
});
}, callback);
};
}());
/*@
Ox.getJSON <f> Get and parse one or more remote JSON files
(url, callback) -> <u> undefined
url <s|a> One or more remote URLs
callback <f> Callback function
data <*|o> The parsed content of the remote resource(s)
For multiple URLs, keys are file names, values are parsed contents
error <o|null> Error(s)
For multiple URLs, keys are file names, values are error objects
@*/
Ox.getJSON = function(url, callback, isJSONC) {
var urls = Ox.makeArray(url);
Ox.getAsync(urls, function(url, callback) {
Ox.get(url, function(data, error) {
callback(JSON.parse(
isJSONC ? Ox.minify(data || '') : data
), error);
});
}, callback);
};
/*@
Ox.getJSONC <f> Get and parse a remote JSONC file
JSONC is JSON with JavaScript line or block comments
(url, callback) -> <u> undefined
url <s|a> One or more remote URLs
callback <f> Callback function
data <*|o> The parsed content of the remote resource(s)
For multiple URLs, keys are file names, values are parsed contents
error <o|null> Error(s)
For multiple URLs, keys are file names, values are error objects
@*/
Ox.getJSONC = function(url, callback) {
Ox.getJSON(url, function(results, errors) {
callback(results, errors);
}, true);
};
/*@
Ox.getJSONP <f> Get and parse one or more remote JSONP files
(url, callback) -> <u> undefined
url <s|a> One or more remote URLs
{callback} gets replaced with jsonp callback function name
callback <f> Callback function
data <*|o> The parsed content of the remote resource(s)
For multiple URLs, keys are file names, values are parsed contents
error <o|null> Error(s)
For multiple URLs, keys are file names, values are error objects
@*/
Ox.getJSONP = function(url, callback) {
var urls = Ox.makeArray(url);
Ox.getAsync(urls, function(url, callback) {
var id = 'callback' + Ox.uid();
Ox.getJSONP[id] = function(data) {
delete Ox.getJSONP[id];
callback(data, null);
};
Ox.$('body').append(Ox.$('<script>').attr({
'src': url.replace('{callback}', 'Ox.getJSONP.' + id),
'type': 'text/javascript'
}));
}, callback);
};