title: Django - How to auto populate form field from two others fields
body: <p>Here's what I'm looking for. In my form I have three fields, all CharFields. Those are Name, Surname and Username. Username should be set as a sum of Name and Surname, so for Name = Joe, Surname = Black, Username = Joe Black.</p>
  
  <p>As the form is displayed, all fields all empty. I'd like it to auto-populate the Username while i'm writing data to a Name or a Surname. The reason of this is that I don't have to fill the Username field, but when I'd like to, I will be able to set it different than Name + Surname.</p>
  
  <p>Is it possible without using jQuery? If so, is there any good tutorial on this?</p>