javascript - Jquery: Why if I had a jquery trigger inside in other, the second when occurs fire multiple times? -


i have follow code make toggle vertical dropdown. problem happens when mouseenter several times in 'ul > li > a' , after select de submenu , enter inside it, second trigger fires multiple times.

$('nav > ul > li > a').on('mouseenter',function(e){     var currentid = this;     var index = $('ul.topnav > li > a').index(this);     $(this).addclass('selected');     $('nav ul ul').css('margin-top',(38*parseint(index)));      $(this).parent().find('ul').on('mouseenter',function(e){         //fire several times         console.log('hover');                    $(currentid).addclass('selected');     }).on('mouseleave',function(e){         $(currentid).removeclass('selected');         //fire several times         console.log('end hover');     });  }).on('mouseleave',function(e){     $(this).removeclass('selected'); );

you binding events subelements of each time hover nav > ul > li > a.

try this:

$('nav > ul > li > a').each(function(e){      $(this).on('mouseenter',function(e){         var index = $('ul.topnav > li > a').index(this);         $(this).addclass('selected');         $('nav ul ul').css('margin-top',(38*parseint(index)));     }).on('mouseleave',function(e){         $(this).removeclass('selected');     );      var currentid = this;      $(this).parent().find('ul').on('mouseenter',function(e){         //fire several times         console.log('hover');                    $(currentid).addclass('selected');     }).on('mouseleave',function(e){         $(currentid).removeclass('selected');         //fire several times         console.log('end hover');     });  });

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