title: How to implement auto save for a form?
body: <p>I plan on using ReactiveForms with the help of FormBuilder. And I'm wondering in which way auto save can be implemented. I need the following behaviour:</p>
  
  <p>There's no submit button on a page. When user makes changes within a form, the data is automatically saved and gets sent to a server.</p>
  
  <p>How can this be achieved in Angular2? </p>
  
  <p>Thank you.</p>