Using jQuery to test if an input is focus

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Using jQuery to test if an input has focus - StackOverflow

jQuery 1.6+

jQuery added a :focus selector so we no longer need to add it ourselves…

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return $('elem').is(':focus') ? true : false;

jQuery 1.5 and below

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jQuery.expr[':'].focus = function( elem ) {
  return elem === document.activeElement && (elem.type || elem.href);
};

Any version of jQuery

If you just want to figure out which element has focus, you can use $(document.activeElement); If you aren’t sure if the version will be 1.6 or lower, you can add the :focus selector if it is missing:

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(function ($) {
  var filters = $.expr[":"];
  if (!filters.focus) {
    filters.focus = function( elem ) {
      return elem === document.activeElement && (elem.type || elem.href);
    };
  }
})(jQuery);
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