.focus() | jQuery UI 1.10 Documentation

.focus( delay [, callback ] )Returns: jQuery

Description: Asynchronously set focus to an element.

.focus( delay [, callback ] )
- delay
  
  Type: Integer
  
  The number of milliseconds to wait before setting focus.
- callback
  
  Type: Function()
  
  A function to invoke after the element has been focused.

This plugin extends jQuery's built-in .focus() method. If jQuery UI is not loaded, calling the .focus() method may not fail directly, as the method still exists. However, the expected behavior will not occur.