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A simple jQuery function that adds a class when the target(s) is in the viewport
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| function onViewport(el, elClass, offset, callback) { | |
| /*** Based on http://ejohn.org/blog/learning-from-twitter/ ***/ | |
| var didScroll = false; | |
| var this_top; | |
| var height; | |
| var top; | |
| if(!offset) { var offset = 0; } | |
| $(window).scroll(function() { | |
| didScroll = true; | |
| }); | |
| setInterval(function() { | |
| if (didScroll) { | |
| didScroll = false; | |
| top = $(this).scrollTop(); | |
| $(el).each(function(i){ | |
| this_top = $(this).offset().top - offset; | |
| height = $(this).height(); | |
| // Scrolled within current section | |
| if (top >= this_top && !$(this).hasClass(elClass)) { | |
| $(this).addClass(elClass); | |
| if (typeof callback == "function") callback(el); | |
| } | |
| }); | |
| } | |
| }, 100); | |
| } |
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