javascript upload drag and drop code example

Example: add drag drop to input type file

<!DOCTYPE html>
<html>
<body>
<div id="dropContainer" style="border:1px solid black;height:100px;">
   Drop Here
</div>
  Should update here:
  <input type="file" id="fileInput" />
  
  
<script>
dropContainer.ondragover = dropContainer.ondragenter = function(evt) {
  evt.preventDefault();
};

dropContainer.ondrop = function(evt) {
  // pretty simple -- but not for IE :(
  fileInput.files = evt.dataTransfer.files;

  // If you want to use some of the dropped files
  const dT = new DataTransfer();
  dT.items.add(evt.dataTransfer.files[0]);
  dT.items.add(evt.dataTransfer.files[3]);
  fileInput.files = dT.files;

  evt.preventDefault();
};
</script>

</body>
</html>

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