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HTML

              
                <div id="page-wrapper" class="clearfix">
    <h1>HTML5 Text Editor</h1>
    <p>Powered by the FileSystem APIs.</p>

    <form action="#" method="POST" id="file-form">
      <div class="field">
        <input type="text" name="filename" id="filename" placeholder="Filename (e.g. treehouse.txt)">
      </div>
      <div class="field">
        <textarea name="content" id="content" placeholder="Type your content here..."></textarea>
      </div>
      <div class="field">
        <button type="submit">Save File</button>
        <div id="messages"></div>
      </div>
    </form>

    <div id="files">
      <h2>File Browser</h2>
      <ul id="file-list"></ul>
    </div>

  </div>
              
            
!

CSS

              
                *, *:before, *:after {
  -moz-box-sizing: border-box;
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

html {
  font-family: Helvetica, Arial, sans-serif;
  font-size: 100%;
  background: #333;
  color: #33383D;
  -webkit-font-smoothing: antialiased;
}

#page-wrapper {
  width: 960px;
  background: #FFF;
  padding: 1.25rem;
  margin: 1rem auto;
  min-height: 300px;
  border-top: 5px solid #69c773;
  box-shadow: 0 2px 10px rgba(0,0,0,0.8);
}

h1 {
  margin: 0;
}

h2 {
  margin-top: 0;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: #999;
}

p {
  font-size: 0.9rem;
  margin: 0.5rem 0 1.5rem 0;
}

a,
a:visited {
  color: #08C;
  text-decoration: none;
}

a:hover,
a:focus {
  color: #69c773;
  cursor: pointer;
}

a.delete-file,
a.delete-file:visited {
  color: #CC0000;
  margin-left: 0.5rem;
}

#file-form {
  width: 650px;
  float: left;
}

.field {
  margin-bottom: 1rem;
}

input,
textarea {
  width: 100%;
  padding: 0.5rem;
  font-size: 1rem;
  border: 1px solid #D9D9D9;
  border-radius: 3px;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.1);
}

textarea {
  min-height: 300px;
}

button {
  display: inline-block;
  border-radius: 3px;
  border: none;
  font-size: 0.9rem;
  padding: 0.6rem 1em;
  background: #86b32d;
  border-bottom: 1px solid #5d7d1f;
  color: white;
  margin: 0 0.25rem;
  text-align: center;
}

button:hover {
  opacity: 0.75;
  cursor: pointer;
}

#files {
  width: 230px;
  float: right;
}

#files ul {
  margin: 0;
  padding: 0.5rem 1rem;
  height: 330px;
  overflow-y: auto;
  list-style: none;
  background: #F7F7F7;
  border: 1px solid #D9D9D9;
  border-radius: 3px;
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.1);
}

#files li {
  padding: 0.5rem 0;
}

#messages {
  display: inline-block;
  font-weight: bold;
  color: #69c773;
  margin-left: 1rem;
}

/* Clearfix Utils */

.clearfix {
  *zoom: 1;
}

.clearfix:before,
.clearfix:after {
  display: table;
  line-height: 0;
  content: "";
}

.clearfix:after {
  clear: both;
}

              
            
!

JS

              
                
// Allow for vendor prefixes.
window.requestFileSystem = window.requestFileSystem ||
                           window.webkitRequestFileSystem;


// Create a variable that will store a reference to the FileSystem.
var filesystem = null;

// Get references to the page elements.
var form = document.getElementById('file-form');
var filenameInput = document.getElementById('filename');
var contentTextArea = document.getElementById('content');

var fileList = document.getElementById('file-list');

var messageBox = document.getElementById('messages');


// A simple error handler to be used throughout this demo.
function errorHandler(error) {
  var message = '';

  switch (error.code) {
    case FileError.SECURITY_ERR:
      message = 'Security Error';
      break;
    case FileError.NOT_FOUND_ERR:
      message = 'Not Found Error';
      break;
    case FileError.QUOTA_EXCEEDED_ERR:
      message = 'Quota Exceeded Error';
      break;
    case FileError.INVALID_MODIFICATION_ERR:
      message = 'Invalid Modification Error';
      break;
    case FileError.INVALID_STATE_ERR:
      message = 'Invalid State Error';
      break;
    default:
      message = 'Unknown Error';
      break;
  }

  console.log(message);
}


// Request a FileSystem and set the filesystem variable.
function initFileSystem() {
  navigator.webkitPersistentStorage.requestQuota(1024 * 1024 * 5,
    function(grantedSize) {

      // Request a file system with the new size.
      window.requestFileSystem(window.PERSISTENT, grantedSize, function(fs) {

        // Set the filesystem variable.
        filesystem = fs;

        // Setup event listeners on the form.
        setupFormEventListener();

        // Update the file browser.
        listFiles();

      }, errorHandler);

    }, errorHandler);
}


function loadFile(filename) {
  filesystem.root.getFile(filename, {}, function(fileEntry) {

    fileEntry.file(function(file) {
      var reader = new FileReader();

      reader.onload = function(e) {
        // Update the form fields.
        filenameInput.value = filename;
        contentTextArea.value = this.result;
      };

      reader.readAsText(file);
    }, errorHandler);

  }, errorHandler);
}


function displayEntries(entries) {
  // Clear out the current file browser entries.
  fileList.innerHTML = '';

  entries.forEach(function(entry, i) {
    var li = document.createElement('li');

    var link = document.createElement('a');
    link.innerHTML = entry.name;
    link.className = 'edit-file';
    li.appendChild(link);

    var delLink = document.createElement('a');
    delLink.innerHTML = '[x]';
    delLink.className = 'delete-file';
    li.appendChild(delLink);

    fileList.appendChild(li);

    // Setup an event listener that will load the file when the link
    // is clicked.
    link.addEventListener('click', function(e) {
      e.preventDefault();
      loadFile(entry.name);
    });

    // Setup an event listener that will delete the file when the delete link
    // is clicked.
    delLink.addEventListener('click', function(e) {
      e.preventDefault();
      deleteFile(entry.name);
    });
  });
}


function listFiles() {
  var dirReader = filesystem.root.createReader();
  var entries = [];

  var fetchEntries = function() {
    dirReader.readEntries(function(results) {
      if (!results.length) {
        displayEntries(entries.sort().reverse());
      } else {
        entries = entries.concat(results);
        fetchEntries();
      }
    }, errorHandler);
  };

  fetchEntries();
}


// Save a file in the FileSystem.
function saveFile(filename, content) {
  filesystem.root.getFile(filename, {create: true}, function(fileEntry) {

    fileEntry.createWriter(function(fileWriter) {

      fileWriter.onwriteend = function(e) {
        // Update the file browser.
        listFiles();

        // Clean out the form field.
        filenameInput.value = '';
        contentTextArea.value = '';

        // Show a saved message.
        messageBox.innerHTML = 'File saved!';
      };

      fileWriter.onerror = function(e) {
        console.log('Write error: ' + e.toString());
        alert('An error occurred and your file could not be saved!');
      };

      var contentBlob = new Blob([content], {type: 'text/plain'});

      fileWriter.write(contentBlob);

    }, errorHandler);

  }, errorHandler);
}


function deleteFile(filename) {
  filesystem.root.getFile(filename, {create: false}, function(fileEntry) {

    fileEntry.remove(function(e) {
      // Update the file browser.
      listFiles();

      // Show a deleted message.
      messageBox.innerHTML = 'File deleted!';
    }, errorHandler);

  }, errorHandler);
}


// Add event listeners on the form.
function setupFormEventListener() {

  form.addEventListener('submit', function(e) {
    e.preventDefault();

    // Get the form data.
    var filename = filenameInput.value;
    var content = contentTextArea.value;

    // Save the file.
    saveFile(filename, content);
  });

}

// Start the app by requesting a FileSystem (if the browser supports the API)
if (window.requestFileSystem) {
  initFileSystem();
} else {
  alert('Sorry! Your browser doesn\'t support the FileSystem API :(');
}
              
            
!
999px

Console