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    <p>I still don't know what was wrong with <code>undelegate</code> which I couldn't make it work, but I managed to fix my code by using <code>on</code> and <code>off</code>.</p> <p>As <a href="https://stackoverflow.com/questions/16266581/jquery-undelegate-does-not-work?noredirect=1#comment23277711_16266581">adeneo said</a> I was delegating and undelegating on each window resize which was quiet a bug and I think I fixed that but holding the last state on <code>device</code> variable.</p> <pre><code>var $window = $(window); var device; function desktopSidenav() { $(".nav-list &gt; li").off('click'); $(".nav-list &gt; li").on('mouseover', function(e) { $(this).find("a").addClass('active'); $(this).find("div.sub-items").toggle(); }).on('mouseout', function(e) { $(this).find('a').removeClass('active'); $(this).find("div.sub-items").toggle(); }); } function handheldSidenav() { $(".nav-list &gt; li").off('mouseover').off('mouseout'); $(".nav-list &gt; li").on('click', function(e) { if ($(this).find("div.sub-items").is(':hidden')) { $(this).find("a:first").addClass('active').next().slideDown('slow'); } else { $(this).find("a:first").removeClass('active').next().slideUp('slow'); } e.preventDefault(); }); } </code></pre> <p>Now I check the window size before doing anything else an I'll hold the device type in <code>device</code> variable. If window is resized, I'm gonna check the device state and do the things based on device type.</p> <pre><code>if ($window.width() &gt; 767) { device = 'desktop'; desktopSidenav(); } else { device = 'handheld'; handheldSidenav(); } $window.resize(function() { if ($window.width() &gt; 767) { if (device == 'handheld') { device = 'desktop'; desktopSidenav(); } } else { if (device == 'desktop') { device = 'handheld'; handheldSidenav(); } } }); </code></pre> <p>If I use <code>delegate</code> and <code>undelegate</code> instead of <code>on</code> and <code>off</code>, the code won't work and I still don't know why, so this cannot be count as a real answer, but I wanted to tell everyone who has a similar problem to use jQuery's <code>on</code> and <code>off</code> instead on <code>delegate</code>.</p>
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    1. POjQuery Undelegate does not work
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    1. USFarid Rn
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    1. POjQuery Undelegate does not work
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    1. COIt sounds like you are not sure which code paths are really being run in different circumstances. Add lots of `console.log` statements to learn what is really happening. It would be quicker than: guess; fail; guess again; fail again; ad infinitum.
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      1. USSean Hogan
 

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