139 lines
4.5 KiB
JavaScript
139 lines
4.5 KiB
JavaScript
'use strict';
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/*@
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Ox.get <f> Get a remote file
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# fixme: remote? same-origin-policy? jsonp?
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(url, callback) -> <u> undefined
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url <s> Remote URL
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callback <f> Callback function
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data <s> The contents of the remote resource
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@*/
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Ox.get = function(url, callback) {
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var req = new XMLHttpRequest();
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req.open('GET', url, true);
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req.onreadystatechange = function() {
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if (req.readyState == 4) {
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if (req.status == 200) {
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callback(req.responseText);
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} else {
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throw new Error(
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'Cannot get URL "' + url + '" (Status: ' + req.status + ')'
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);
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}
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}
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};
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req.send();
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};
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/*@
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Ox.getJSON <f> Get and parse a remote JSON file
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# fixme: remote? same-origin-policy? jsonp?
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(url, callback) -> <u> undefined
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url <s> Remote URL
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callback <f> Callback function
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data <s> The parsed contents of the remote resource
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@*/
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Ox.getJSON = function(url, callback) {
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Ox.get(url, function(data) {
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callback(JSON.parse(data));
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});
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};
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/*@
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Ox.getJSONC <f> Get and parse a remote JSONC file
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JSONC is JSON with JavaScript line or block comments
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(url, callback) -> <u> undefined
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url <s> Remote URL
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callback <f> Callback function
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data <s> The parsed contents of the remote resource
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@*/
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Ox.getJSONC = function(url, callback) {
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Ox.get(url, function(data) {
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callback(JSON.parse(Ox.minify(data)));
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});
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};
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/*@
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Ox.loadFile <f> Loads a file (image, script or stylesheet)
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(file="script.js", callback) -> <u> undefined
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(file="stylesheet.css", callback) -> <u> undefined
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(file="image.png", callback) -> <e> DOM element
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file <s> Local path or remote URL
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callback <f> Callback function
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@*/
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Ox.loadFile = (function() {
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// fixme: this doesn't handle errors yet
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// fixme: rename to getFile?
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// fixme: what about array of files?
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var cache = {};
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return function (file, callback) {
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var element,
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head = document.head || document.getElementsByTagName( "head" )[0] || document.documentElement,
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request,
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type = file.split('.').pop(),
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isImage = type != 'css' && type != 'js';
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if (!cache[file]) {
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if (isImage) {
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element = new Image();
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element.onload = addFileToCache;
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element.src = file;
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} else {
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if (!findFileInHead()) {
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element = document.createElement(
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type == 'css' ? 'link' : 'script'
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);
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element[type == 'css' ? 'href' : 'src'] = file + '?' + Ox.random(1000000);
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element.type = type == 'css' ? 'text/css' : 'text/javascript';
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if (/MSIE/.test(navigator.userAgent)) {
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// fixme: find a way to check if css/js have loaded in msie
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setTimeout(addFileToCache, 2500);
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} else {
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if (type == 'css') {
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element.rel = 'stylesheet';
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waitForCSS();
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} else {
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element.onload = addFileToCache;
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}
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}
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head.appendChild(element);
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} else {
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addFileToCache();
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}
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}
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} else {
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callback();
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}
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function addFileToCache() {
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if (isImage) {
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// for an image, save the element itself,
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// so that it remains in the browser cache
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cache[file] = element;
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callback(element);
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} else {
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cache[file] = true;
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callback();
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}
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}
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function findFileInHead() {
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return Ox.makeArray(
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document.getElementsByTagName(type == 'css' ? 'link' : 'script')
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).map(function(element) {
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return element[type == 'css' ? 'href' : 'src'] == file;
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}).reduce(function(prev, curr) {
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return prev || curr;
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}, false);
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}
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function waitForCSS() {
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var error = false;
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try {
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element.sheet.cssRule;
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} catch(e) {
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error = true;
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setTimeout(function() {
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waitForCSS();
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}, 25);
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}
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!error && addFileToCache();
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}
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};
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}());
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