Javascript bug when switching tabs
Hello,
I'm developing a simple web site with an image slideshow on the front page. The slideshow is powered by javascript and are using javascript's "setTimeout" function to toggle between images with a jQuery animation. However, when I switch to another tab and wait for a while, then switch back, it seems like all animations that should have been run in the background has been queued up and then runs simultaneously as soon as I switch back to the original tab. Basically it freaks out for a few seconds when all stacked up animations are run, and then it goes back to the normal behaviour.
Is this a bug or a feature? And if it's a feature, how would you suggest that I code my javascript to avoid this problem?
Athraithe ag sebastiancarlsson ar
All Replies (2)
Try posting at the Web Development / Standards Evangelism forum at MozillaZine. The helpers over there are more knowledgeable about web page development issues with Firefox.
http://forums.mozillazine.org/viewforum.php?f=25
You'll need to register and login to be able to post in that forum.
See Additional Notes -section of JQuery's animate-function documentation
" Because of the nature of requestAnimationFrame(), you should never queue animations using a setInterval or setTimeout loop. In order to preserve CPU resources, browsers that support requestAnimationFrame will not update animations when the window/tab is not displayed.
If you continue to queue animations via setInterval or setTimeout while animation is paused, all of the queued animations will begin playing when the window/tab regains focus.
To avoid this potential problem, use the callback of your last animation in the loop, or append a function to the elements .queue() to set the timeout to start the next animation. "