Sha256: b7a51de3db800329ad504c3528ee3f1285caabd3f988456e8a0beedaf5a9f33c
Contents?: true
Size: 1.8 KB
Versions: 85
Compression:
Stored size: 1.8 KB
Contents
pageflow.bandwidth = function() {
var maxLoadTime = 5000;
pageflow.bandwidth.promise = pageflow.bandwidth.promise || new $.Deferred(function(deferred) {
var smallFileUrl = pageflow.assetUrls.smallBandwidthProbe + "?" + new Date().getTime(),
largeFileUrl = pageflow.assetUrls.largeBandwidthProbe + "?" + new Date().getTime(),
smallFileSize = 165,
largeFileSize = 1081010;
$.when(timeFile(smallFileUrl), timeFile(largeFileUrl))
.done(function(timeToLoadSmallFile, timeToLoadLargeFile) {
var timeDelta = (timeToLoadLargeFile - timeToLoadSmallFile) / 1000;
var bitsDelta = (largeFileSize - smallFileSize) * 8;
timeDelta = Math.max(timeDelta, 0.01);
deferred.resolve({
durationInSeconds: timeDelta,
speedInBps: (bitsDelta / timeDelta).toFixed(2)
});
})
.fail(function() {
deferred.resolve({
durationInSeconds: Infinity,
speedInBps: 0
});
});
}).promise();
return pageflow.bandwidth.promise;
function timeFile(url) {
var startTime = new Date().getTime();
return withTimeout(loadFile(url), maxLoadTime).pipe(function() {
return new Date().getTime() - startTime;
});
}
function loadFile(url, options) {
return new $.Deferred(function(deferred) {
var image = new Image();
image.onload = deferred.resolve;
image.onerror = deferred.reject;
image.src = url;
}).promise();
}
function withTimeout(promise, milliseconds) {
return new $.Deferred(function(deferred) {
var timeout = setTimeout(function() {
deferred.reject();
}, milliseconds);
promise
.always(function() {
clearTimeout(timeout);
})
.then(deferred.resolve, deferred.reject);
}).promise();
}
};
Version data entries
85 entries across 85 versions & 1 rubygems