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What's happening

Okay, so I've made a function on my front page where some products are shown besides each other, fading out, changing products and fading back in every 5 seconds. The code looks like this:

var t; $(document).ready(function(){ // Some pre-animation stuff, like loading the products etc. // Initialize animation timer t = setInterval("changeProducts();", 5000); }; function changeProducts() { // Fade out $("#anfBox").fadeTo(200, 0.01, function() { // Change products // Fade back in $("#anfBox").fadeTo(200, 1); }); }

It all looks fine and runs as it should, except when i go to another window for a minute and then comes back, the changeProducts function is executed rapidly a few times (depending on how long i've been away). The products fade out, change fades in again, and then repeats instantly, where there should be a ~5 second delay.

What I've tried

So what I think I need to do is use something like clearInterval(t) when the focus is lost from the window, then re-initialize the timer when the window is re-entered, i just don't know how to do that, and i'm having a hard time finding anything useful on google.

I'm thinking maybe there's allso a way to run the animations even if the window is not in focus to avoid the function-queue.

I've also tried using setTimeout() instead but with no luck.

Any ideas on how to avoid the animation-queue is much appreciated.

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1 Answer 1

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With the latest browser updates lots of browsers now stop execution of code when current page or tab is not active. When you return that tab/window it executes all of queued actions and you see a rush of effect running each after.

Simply check effect queue before apply another effect, if queue's length is 0 then apply.

Try this (example);

var t; function changeProducts() { // Fade out var $anfBox = $("#anfBox"), queue = $anfBox.queue('fx'); if (queue && queue.length === 0) { $anfBox.fadeTo(200, 0.01, function() { // Change products // Fade back in $anfBox.fadeTo(200, 1); }); } } $(document).ready(function() { // Some pre-animation stuff, like loading the products etc. // Initialize animation timer t = setInterval(changeProducts, 5000); });
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1 Comment

This works perfectly, thanks allot. :) The jsfiddle link is a nice touch to the answer as well.

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