title: Who to limit a textbox to a list of words, not admitting any other
body: <p>I apologize for my English.</p>
  
  <p>I wanted to know how I can limit a textbox to a list of words, not admitting any other.
  Example: {London, Lisbon, Paris, Rome, Madrid}, the user can only type these words.
  How to do this...</p>
  
  <p>Thankful for the help</p>