title: How to check password while typing
body: <p>i want to build a website and need to make a change password site. How can i check the password while typing?</p>
  
  <p>See this example with the infobox at the right side.</p>
  
  <p><a href="https://i.stack.imgur.com/XK3Vy.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XK3Vy.png" alt="enter image description here"></a></p>
  
  <p>I use Angular2 and want to do that with typescript.</p>