title: how to create form with a drop-down list that change the other option depend on selection
body: <p>I'm trying to create form with a drop-down list that can dynamically show different option when you select an element from the drop-down list. </p>
  
  <p>for example, if you have a drop-down list for the countries and another drop-down for states, when the user selects US from the countries drop-down, the states drop-down should change to show US states. if the user selected Canada , it should show Canadian states in states drop-down. </p>
  
  <p>I hope it's clear and sorry for my complicated explanation.</p>
  
  <p>I need a specific solution for cakePHP and the other thread dosen't answer and solve for the newer version of CakePHP.</p>