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    <p>While adding <code>stop()</code> before <code>animate()</code> will resolve the problem, it may be worth understanding the source of the problem.</p> <p>In this case, the user observes a delay in the animation because multiple animations are in the queue before it.</p> <p>One contributor to the queue backing up because the animation function complete call is executed once per animated element, not once for the animation as a whole. In the following example, the complete call is invoked twice, which in turn invokes another animation, causing 4 animations to enter the queue.</p> <p>For example:</p> <pre><code>$("ul#menu a").click(function() { myId = this.id; $("ul#menu, h1#logo").animate({left: '-=572'}, 500, function() { // This code will run twice, once when ul#menu finishes animating // and once when h1#logo finishes animating. Is this the desired // behavior? Is it safe to call api.goTo() twice? $("#lang").css("display", "none"); $("#"+myId+"pr").animate({left: 0}, 200); if(myId == "dojazd") { $("#outer-mapka").css("left", "50%").css("margin-left", "-213px"); } else { api.goTo(myId.charAt(myId.length-1)); } }); }); </code></pre> <p>Another contributor to the queue backup, and the primary contribution, is because of a generic selector. In the following example, when a closed link is clicked, it causes all 7 text classes to animate, and when they complete, they cause 2 more animations. Resulting in 21 animations:</p> <pre><code>$("a.close").click(function() { api.goTo(1); // The .text selector matches seven different elements. Thus, a when // clicking the close link, seven animations are added to the queue. $(".text").animate({left: "-=950"}, 200, function() { $(".text, #outer-mapka").css("left", "-950px"); // And two more animations are added to the queue. $("ul#menu, h1#logo").animate({left: '0'}, 500, function() {} ); $("#lang").css("display", "block"); }); }); </code></pre> <p>Thus, when you clicked a menu, closed the page, then clicked the menu again, a delay could be observed waiting for the 21 animations to go through the queue.</p> <p>To resolve this, one can use a flag to indicate if the complete function should run. Additionally, being more specific on the selectors can help prevent unnecessary invocations. Here is a possible solution implementing both:</p> <pre><code>$(window).load(function() { mCustomScrollbars(); $(function(){ var menu_visible=true; // Flag to indicate if menu is visible. $("ul#menu a").click(function() { myId = this.id; $("ul#menu, h1#logo").animate({left: '-=572'}, 500, function() { // If the menu is not visible, then return as this function has // already ran. if (!menu_visible) return; // Will be hiding the menu, so set the flag to false. menu_visible = false; $("#lang").css("display", "none"); $("#"+myId+"pr").animate({left: 0}, 200); if(myId == "dojazd") { $("#outer-mapka").css("left", "50%").css("margin-left", "-213px"); } else { api.goTo(myId.charAt(myId.length-1)); } }); }); // For each text class. $(".text").each(function() { // Store a handle to the text. var $text=$(this); // Add a click event to a close link within the text. $("a.close", $text).click(function() { api.goTo(1); // Only animate the text containing the close link. $text.animate({left: "-=950"}, 200, function() { $(".text, #outer-mapka").css("left", "-950px"); $("ul#menu, h1#logo").animate({left: '0'}, 500, function() { // The menu is visible so set the flag. menu_visible=true; }) ; $("#lang").css("display", "block"); }); }); }); }); }); </code></pre>
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