How to generate a thumbnail image after adding an image inside an input type=”file” in a form and submitting them both on the same form

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I found This simpler yet powerful tutorial. It simply creates an img element and, using the fileReader object, assigns its source attribute as the value of the form input

function previewFile() {
  var preview = document.querySelector('img');
  var file    = document.querySelector('input[type=file]').files[0];
  var reader  = new FileReader();

  reader.onloadend = function () {
    preview.src = reader.result;
  }

  if (file) {
    reader.readAsDataURL(file);
  } else {
    preview.src = "";
  }
}
<input type="file" onchange="previewFile()"><br>
<img src="" height="200" alt="Image preview...">

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