39 lines
1.4 KiB
JavaScript
39 lines
1.4 KiB
JavaScript
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var startTime;
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var endTime;
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var testConnectionSpeed = {
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imageAddr: 'https://upload.wikimedia.org/wikipedia/commons/a/a6/Brandenburger_Tor_abends.jpg', // this is just an example, you rather want an image hosted on your server
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downloadSize: 2707459, // this must match with the image above
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getConnectionSpeed: function(callback) {
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testConnectionSpeed.InitiateSpeedDetection();
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testConnectionSpeed.callback = callback;
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},
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InitiateSpeedDetection: function() {
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window.setTimeout(testConnectionSpeed.MeasureConnectionSpeed, 1);
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},
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result: function() {
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var duration = (endTime - startTime) / 1000;
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var bitsLoaded = testConnectionSpeed.downloadSize * 8;
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var speedBps = (bitsLoaded / duration).toFixed(2);
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var speedKbps = (speedBps / 1024).toFixed(2);
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var speedMbps = (speedKbps / 1024).toFixed(2);
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testConnectionSpeed.callback(speedMbps);
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},
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MeasureConnectionSpeed: function() {
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var download = new Image();
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download.onload = function() {
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endTime = (new Date()).getTime();
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testConnectionSpeed.result();
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};
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startTime = (new Date()).getTime();
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var cacheBuster = '?nnn=' + startTime;
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download.src = testConnectionSpeed.imageAddr + cacheBuster;
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},
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};
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// start test immediatly, you could also call this on any event or whenever you want
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// testConnectionSpeed.getConnectionSpeed(function(time) { console.log(time) });
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module.exports = testConnectionSpeed.getConnectionSpeed;
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