Autosave forms to local storage

[jeremydw]

A project has requested an "autosave" feature for a form. We should implement a module that autosaves forms to local storage and restores them when the page is reloaded. There should be an API to clear the saved form data.

• Thinking that the key names could be determined based on the field names.
• By default, I would say that the form should autosave on keyup, debounced.

Some ideas around sample usage:

<form id="example">
  <input type="text" name="title">
  ...
</form>

var autosave = require('airkit/forms/autosave');

var el = document.getElementById('example');
var options = {...};  // Whatever options we might have.
var autosaver = autosave.init(el, options);
autosaver.clear();  // Clears saved data.