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December 12, 2015 03:59
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jQuery filter to detect if a element or part of it is appearing in the window (viewport)
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jQuery.expr[':'].appearing = function(elem) { | |
var $window = $(window), | |
windowViewTop = $window.scrollTop(), | |
windowViewBottom = windowViewTop + $window.height(), | |
elemTop = $(elem).offset().top, | |
elemBottom = elemTop + $(elem).height(), | |
isAppearingFully = ((elemTop >= windowViewTop) && (elemBottom <= windowViewBottom)), | |
isAppearingBottom = ((windowViewTop > elemTop) && (windowViewTop < elemBottom)), | |
isAppearingTop = ((windowViewBottom > elemTop) && (windowViewTop < elemBottom)); | |
return isAppearingFully || isAppearingBottom || isAppearingTop; | |
}; |
Nice improvement.
Updated :D
There's an error in line 9, it should be
#9: isAppearingFully = ((elemTop >= windowViewTop) && (elemBottom <= windowViewBottom)),
I've fixed it. Thanks @jhuesos
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A little improvement: