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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <title>Cropper.js</title>
  <link rel="stylesheet" href="../css/cropper.css">
  <style>
    .container {
      margin: 20px auto;
      max-width: 960px;
    }

    img {
      max-width: 100%;
    }

    .row,
    .preview {
      overflow: hidden;
    }

    .col {
      float: left;
    }

    .col-6 {
      width: 50%;
    }

    .col-3 {
      width: 25%;
    }

    .col-2 {
      width: 16.7%;
    }

    .col-1 {
      width: 8.3%;
    }
  </style>
</head>
<body>
  <div class="container">
    <h1>Customize preview for Cropper</h1>
    <div class="row">
      <div class="col col-6">
        <img id="image" src="../images/picture.jpg" alt="Picture">
      </div>
      <div class="col col-3">
        <div class="preview"></div>
      </div>
      <div class="col col-2">
        <div class="preview"></div>
      </div>
      <div class="col col-1">
        <div class="preview"></div>
      </div>
    </div>
  </div>

  <script src="../js/cropper.js"></script>
  <script>
    function each(arr, callback) {
      var length = arr.length;
      var i;

      for (i = 0; i < length; i++) {
        callback.call(arr, arr[i], i, arr);
      }

      return arr;
    }

    window.addEventListener('DOMContentLoaded', function () {
      var image = document.querySelector('#image');
      var previews = document.querySelectorAll('.preview');
      var previewReady = false;
      var cropper = new Cropper(image, {
          ready: function () {
            var clone = this.cloneNode();

            clone.className = '';
            clone.style.cssText = (
              'display: block;' +
              'width: 100%;' +
              'min-width: 0;' +
              'min-height: 0;' +
              'max-width: none;' +
              'max-height: none;'
            );

            each(previews, function (elem) {
              elem.appendChild(clone.cloneNode());
            });
            previewReady = true;
          },

          crop: function (event) {
            if (!previewReady) {
              return;
            }

            var data = event.detail;
            var cropper = this.cropper;
            var imageData = cropper.getImageData();
            var previewAspectRatio = data.width / data.height;

            each(previews, function (elem) {
              var previewImage = elem.getElementsByTagName('img').item(0);
              var previewWidth = elem.offsetWidth;
              var previewHeight = previewWidth / previewAspectRatio;
              var imageScaledRatio = data.width / previewWidth;

              elem.style.height = previewHeight + 'px';
              previewImage.style.width = imageData.naturalWidth / imageScaledRatio + 'px';
              previewImage.style.height = imageData.naturalHeight / imageScaledRatio + 'px';
              previewImage.style.marginLeft = -data.x / imageScaledRatio + 'px';
              previewImage.style.marginTop = -data.y / imageScaledRatio + 'px';
            });
          },
        });
    });
  </script>
</body>
</html>