title: Oracle APEX Show Custom Alert Message Using Page Item Value
body: <p>I am trying to create a DA in order to show as an alert the value of my item page P2003_TEMP_DOUBLE.
  This value is not stored to any table in my database. The result of this action is a null alert!</p>
  <p><a href="https://i.stack.imgur.com/sd5J1.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sd5J1.png" alt="enter image description here" /></a></p>