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IEATCODE answered on May 2, 2022 Popularity 8/10 Helpfulness 2/10

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Popularity 8/10 Helpfulness 2/10 Language python

Source: Grepper

Tags: python

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Contributed on May 02 2022

IEATCODE

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How to detect internet speed in JavaScript

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var arrTimes = [];
var i = 0; // start
var timesToTest = 5;
var tThreshold = 150; //ms
var testImage = "http://www.google.com/images/phd/px.gif"; // small image in your server
var dummyImage = new Image();
var isConnectedFast = false;

testLatency(function(avg){
  isConnectedFast = (avg <= tThreshold);
  /** output */
  document.body.appendChild(
    document.createTextNode("Time: " + (avg.toFixed(2)) + "ms - isConnectedFast? " + isConnectedFast)
  );
});

/** test and average time took to download image from server, called recursively timesToTest times */
function testLatency(cb) {
  var tStart = new Date().getTime();
  if (i<timesToTest-1) {
    dummyImage.src = testImage + '?t=' + tStart;
    dummyImage.onload = function() {
      var tEnd = new Date().getTime();
      var tTimeTook = tEnd-tStart;
      arrTimes[i] = tTimeTook;
      testLatency(cb);
      i++;
    };
  } else {
    /** calculate average of array items then callback */
    var sum = arrTimes.reduce(function(a, b) { return a + b; });
    var avg = sum / arrTimes.length;
    cb(avg);
  }
}
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Popularity 1/10 Helpfulness 1/10 Language javascript

Source: stackoverflow.com

Tags: javascript detect

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Contributed on Dec 31 2024

Landin

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How to detect internet speed in JavaScript

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