JavaScript loading progress of an image

Question

Is there a way in JS to get the progress of a loading image while the image is being loaded? I want to use the new Progress tag of HTML5 to show the progress of loading imag

Answer 1

Actually, in latest chrome you can use it.

$progress = document.querySelector('#progress');

var url = 'https://placekitten.com/g/2000/2000';

var request = new XMLHttpRequest();
request.onprogress = onProgress;
request.onload = onComplete;
request.onerror = onError;

function onProgress(event) {
  if (!event.lengthComputable) {
    return;
  }
  var loaded = event.loaded;
  var total = event.total;
  var progress = (loaded / total).toFixed(2);

  $progress.textContent = 'Loading... ' + parseInt(progress * 100) + ' %';

  console.log(progress);
}

function onComplete(event) {
  var $img = document.createElement('img');
  $img.setAttribute('src', url);
  $progress.appendChild($img);
  console.log('complete', url);
}

function onError(event) {
  console.log('error');
}


$progress.addEventListener('click', function() {
  request.open('GET', url, true);
  request.overrideMimeType('text/plain; charset=x-user-defined');
  request.send(null);
});

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