JSFiddle - React, Tailwind, and code Playground

by kougiland

HTML

<input type="file" id="files" name="files[]" />
<!--<input type="file" id="files" name="files[]" multiple />-->
<output id="list"></output>

CSS

body{
    color:black;
} 
.thumb {
    height: 75px;
    border: 1px solid #000;
    margin: 10px 5px 0 0;
  }

JavaScript

var fileAPI = document.querySelector("#fileAPI");
// Check for the various File API support.
if (window.File && window.FileReader && window.FileList && window.Blob) {
    alert("Great success! All the File APIs are supported.");
} else {
  alert('The File APIs are not fully supported in this browser.');
}

function handleFileSelect(evt) {
    var files = evt.target.files; // FileList object

    // Loop through the FileList and render image files as thumbnails.
    for (var i = 0, f; f = files[i]; i++) {

      // Only process image files.
      if (!f.type.match('image.*')) {
        continue;
      }

      var reader = new FileReader();

      // Closure to capture the file information.
      reader.onload = (function(theFile) {
        return function(e) {
          // Render thumbnail.
          var span = document.createElement('span');
          span.innerHTML = ['<img class="thumb" src="', e.target.result,
                            '" title="', escape(theFile.name), '"/>'].join('');
          document.getElementById('list').insertBefore(span, null);
        };
      })(f);

      // Read in the image file as a data URL.
      reader.readAsDataURL(f);
    }
  }

  document.getElementById('files').addEventListener('change', handleFileSelect, false);