If you are looking for a jQuery plugin to save forms as drafts locally, sisyphus.js will do all the hard work for you. This lightweight jQuery plugin uses Local Storage (or jStorage if older browsers have to be supported) to maintain state of forms.
Plugin comes with some handy options; setup is very simple and multiple forms on the same page can be targeted. By default, plugin looks after all form elements, and if there is a need, some of them can be excluded.
Check out the latest version on github.
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