javascript - Jquery to check if inside element -


i'm trying add class element if user has clicked inside it.

all usual rules apply - "inside" means inside child, grandchild etc.

if inside, need add class - if outside class should removed.

i've pieced example, works, non-javascript man, i'd appreciate feedback whether it's reasonable approach, , if can improved on - improved, refer jquery/javascript performance.

any advice appreciated.

$("body").click(function (e) {      $fs = $(e.target).closest("fieldset.expand");      if ($fs.length) {         $fs.addclass("focus");     }     else {         $("fieldset.expand").removeclass("focus");     } }); 
<body>     <fieldset class="expand">         <input type="text" />         <input type="text" />         <input type="text" />     </fieldset> </body>

makes fieldset focusable (but not tabbable), using tabindex attribute negative value. set logic using focusin focusout events:

$('fieldset.expand').on('focusin focusout', function() {    $(this).toggleclass('focus', $(this).find('*').addback().is(':focus'));  });
fieldset.focus {    outline: 0;    background: red;  }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>  <fieldset tabindex="-1" class="expand">    <input type="text" />    <input type="text" />    <input type="text" />  </fieldset>


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