IDE currently doesn't have a HTML 5 File API autocomplit for Javascript.

Try this code for autocoplit.

function handleFileSelect(evt) {
       var files = evt.target.files; // !!! MISSING AUTOCOMPLIT FOR files[] array only 'freeze()' present for autocomplit purposes
       // files is a FileList of File objects. List some properties.
       var output = [];
          for (var i = 0, f; f = files[i]; i++) {
      output.push('<li><strong>', f.name, '</strong> (', f.type || 'n/a', ') - ',
      f.size, ' bytes, last modified: ',
      f.lastModifiedDate ? f.lastModifiedDate.toLocaleDateString() : 'n/a',
                    '</li>');
            }
            document.getElementById('list').innerHTML = '<ul>' + output.join('') + '</ul>';
        }

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