title: Flash data, or session messages in Dart
body: <p>In advance I apologize if this is a repeat/legacy question, I just couldn't find any related resources for this issue.</p>
  
  <p>I am looking to show temporary user alerts when the user sends a delete, post update request (Think rails/laravel session flash messages) to let them know if it was successful or not. In previous projects I would user a small JQuery script to display the message for a couple seconds and have it disappear on its own. </p>
  
  <p>Are there some related animation fade in/out functions that I can use for this? </p>
  
  <p>Currently I am using QuerySelector to add the message to an alert div, but I am unable to make the alert disappear automatically.</p>