JSFiddle - React, Tailwind, and code Playground

by zedsaid

HTML

<form id="form1" enctype="multipart/form-data" method="post" action="http://www.zedsaid.com/dev/upload">
    <div class="row">
      <label for="fileToUpload">Select a File to Upload</label><br />
      <input type="file" name="fileToUpload" id="fileToUpload" onchange="fileSelected();"/>
    </div>
    <div id="fileName"></div>
    <div id="fileSize"></div>
    <div id="fileType"></div>
    <div class="row">
      <input type="button" onclick="uploadFile()" value="Upload" />
    </div>
    <div id="progressNumber"></div>
  </form>

JavaScript

function fileSelected() {
	var file = document.getElementById('fileToUpload').files[0];
	if (file) {
	  var fileSize = 0;
	  if (file.size > 1024 * 1024)
		fileSize = (Math.round(file.size * 100 / (1024 * 1024)) / 100).toString() + 'MB';
	  else
		fileSize = (Math.round(file.size * 100 / 1024) / 100).toString() + 'KB';

	  document.getElementById('fileName').innerHTML = 'Name: ' + file.name;
	  document.getElementById('fileSize').innerHTML = 'Size: ' + fileSize;
	  document.getElementById('fileType').innerHTML = 'Type: ' + file.type;
	}
  }

      function uploadFile() {
        var fd = new FormData();
        fd.append("fileToUpload", document.getElementById('fileToUpload').files[0]);
        var xhr = new XMLHttpRequest();
        xhr.upload.addEventListener("progress", uploadProgress, false);
        xhr.addEventListener("load", uploadComplete, false);
        xhr.addEventListener("error", uploadFailed, false);
        xhr.addEventListener("abort", uploadCanceled, false);
        xhr.open("POST", "http://www.zedsaid.com/dev/upload");
        xhr.send(fd);
      }

      function uploadProgress(evt) {
        if (evt.lengthComputable) {
          var percentComplete = Math.round(evt.loaded * 100 / evt.total);
          document.getElementById('progressNumber').innerHTML = percentComplete.toString() + '%';
        }
        else {
          document.getElementById('progressNumber').innerHTML = 'unable to compute';
        }
      }

      function uploadComplete(evt) {
        /* This event is raised when the server send back a response */
        alert(evt.target.responseText);
      }

      function uploadFailed(evt) {
        alert("There was an error attempting to upload the file.");
      }

      function uploadCanceled(evt) {
        alert("The upload has been canceled by the user or the browser dropped the connection.");
      }