Client-side Autosave Using localStorage

autosave.js

// Retrieve the object from storage onReady
var autosave = localStorage.getItem('file');

// parses the string (btw. its UTF-8)
var text = JSON.parse(autosave);

//modifies the textarea with the id="inputTextArea" 
$("textarea#inputTextArea").val(text);

// Autosave on keystroke works in offline mode
$("textarea#inputTextArea").change(function(){
  
  // pulls the value from the textarea
  var file = $('textarea#inputTextArea').val();
  
  // sets the file string to hold the data
  localStorage.setItem('file', JSON.stringify(file));
});