Submitted by ultrabob on Thu, 02/16/2017 - 16:42    
  
  
    
  The #ajax['wrapper'] property includes the HTML ID of a page section that should be replaced (or altered in some other way).
  
  The #ajax['callback'] tells the Form system what callback should be called after the Ajax call happens and the form is rebuilt.
    
      
  
  
 
   
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