kopia lustrzana https://github.com/OpenDroneMap/WebODM
89 wiersze
2.7 KiB
JavaScript
89 wiersze
2.7 KiB
JavaScript
var waitSeconds = 100;
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var head = document.getElementsByTagName('head')[0];
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var isWebkit = !!window.navigator.userAgent.match(/AppleWebKit\/([^ ;]*)/);
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var webkitLoadCheck = function(link, callback) {
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setTimeout(function() {
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for (var i = 0; i < document.styleSheets.length; i++) {
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var sheet = document.styleSheets[i];
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if (sheet.href == link.href)
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return callback();
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}
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webkitLoadCheck(link, callback);
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}, 10);
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};
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var cssIsReloadable = function cssIsReloadable(links) {
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// Css loaded on the page initially should be skipped by the first
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// systemjs load, and marked for reload
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var reloadable = true;
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forEach(links, function(link) {
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if(!link.hasAttribute('data-systemjs-css')) {
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reloadable = false;
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link.setAttribute('data-systemjs-css', '');
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}
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});
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return reloadable;
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}
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var findExistingCSS = function findExistingCSS(url){
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// Search for existing link to reload
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var links = head.getElementsByTagName('link')
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return filter(links, function(link){ return link.href === url; });
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}
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var noop = function() {};
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var loadCSS = function(url, existingLinks) {
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return new Promise(function(resolve, reject) {
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var timeout = setTimeout(function() {
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reject('Unable to load CSS');
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}, waitSeconds * 1000);
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var _callback = function(error) {
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clearTimeout(timeout);
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link.onload = link.onerror = noop;
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setTimeout(function() {
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if (error)
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reject(error);
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else
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resolve('');
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}, 7);
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};
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var link = document.createElement('link');
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link.type = 'text/css';
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link.rel = 'stylesheet';
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link.href = url;
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link.setAttribute('data-systemjs-css', '');
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if (!isWebkit) {
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link.onload = function() {
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_callback();
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}
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} else {
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webkitLoadCheck(link, _callback);
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}
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link.onerror = function(event) {
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_callback(event.error || new Error('Error loading CSS file.'));
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};
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if (existingLinks.length)
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head.insertBefore(link, existingLinks[0]);
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else
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head.appendChild(link);
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})
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// Remove the old link regardless of loading outcome
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.then(function(result){
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forEach(existingLinks, function(link){link.parentElement.removeChild(link);})
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return result;
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}, function(err){
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forEach(existingLinks, function(link){link.parentElement.removeChild(link);})
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throw err;
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})
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};
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exports.fetch = function(load) {
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// dont reload styles loaded in the head
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var links = findExistingCSS(load.address);
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if(!cssIsReloadable(links))
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return '';
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return loadCSS(load.address, links);
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}; |