title: Angular2 file input onchange
body: <p>I have input file (without submit - typicall input file). I'd like to call some function when chose file.</p>
  
  <p>Example:
  I click on "Choose file" -> choose file -> now system detects change and call some function which prints all these file information (for example image name).</p>
  
  <p>I can't use ngModel on input file, right? How to do that?</p>