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POHTML5/jQuery metronome - performance problems
 

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    <p>As mentioned in the title I'm trying to create a jQuery/JavaScript based metronome along with the HTML <code>&lt;audio /&gt;</code> tag to play the sound. </p> <p>It works "okay", but it seems to me the <code>setInterval</code> method is not working accurately enough. I searched some threads here, but for I am new to both jQuery and JavaScript and I haven't found a working solution. Same for the "open new tab and setInterval stops or lags" - problem. I tried to prevent that with <code>stop(true,true)</code> but it didn't work as I expected. </p> <p>I want the metronome to run "in background" without changing tempo when opening a new tab and doing something there. Also I want an exact metronome for sure ;)</p> <p>Here's my testing environment located: <a href="http://nie-wieder.net/metronom/test.html" rel="noreferrer">http://nie-wieder.net/metronom/test.html</a></p> <p>At the moment, JS-Code and HTML-markup are all in the test.html source, so you can look there.</p> <p>Also, here's the concerned (as I think) js-code I use:</p> <pre><code>$(document).ready(function() { //vars var intervalReference = 0; var currentCount = 1; var countIncrement = .5; var smin = 10; var smax =240; var svalue = 120; //soundchkbox $(".sndchck").attr("disabled", true); //preload sound $.ajax({ url: "snd/tick.ogg", success: function() { $(".sndchck").removeAttr("disabled"); } }); // tick event var met = $("#bpm").slider({ value: 120, min: smin, max: smax, step: 1, change: function( event, ui ) { var delay = (1000*60/ui.value)/2 clearInterval(intervalReference); //seems to be the Problem for me intervalReference = setInterval(function(){ var $cur_sd = $('#sub_div_'+currentCount); $cur_sd .stop(true,true) .animate({opacity: 1},15, function() { //Play HTML5 Sound if($('#sound_check:checked').val()){ $('#tick') .stop(true,true) .trigger("play"); } $(this). stop(true,true). animate({opacity:0}); } ); currentCount += countIncrement; if(currentCount &gt; 4.5) currentCount = 1 }, delay); createMusicTag(ui); } }); }); </code></pre> <p>Any help would be great, I'm out of ideas for now.</p>
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