title: How do you make a web page change without reloading the page?
body: <p>What should I look into to accomplish this.</p>
  
  <p>When you select an input field some text to the right shows up.</p>
  
  <p>For example: <a href="https://twitter.com/signup" rel="nofollow noreferrer"><a href="https://twitter.com/signup" rel="nofollow noreferrer">https://twitter.com/signup</a></a></p>
  
  <p>Anyway i need something like that works with PHP. What should I look in to?</p>
  
  <p>And also How can you query the database and not have to reload the page to see result? For example i have seen on many sites registration you can check if the a username is used without the page reloading. Dont know how to explain better.</p>
  
  <p>Thanks</p>