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| /*https://medium.com/talk-like/detecting-if-an-element-is-in-the-viewport-jquery-a6a4405a3ea2*/ | |
| $.fn.isInViewport = function() { | |
| var elementTop = $(this).offset().top; | |
| var elementBottom = elementTop + $(this).outerHeight(); | |
| var viewportTop = $(window).scrollTop(); | |
| var viewportBottom = viewportTop + $(window).height(); | |
| return elementBottom > viewportTop && elementTop < viewportBottom; | |
| }; | |
| /*usage*/ | |
| if ($('#element').visible(true)) { | |
| // The element is visible, do something | |
| } else { | |
| // The element is NOT visible, do something else | |
| } | |
| /*other JS*/ | |
| function isScrolledIntoView(elem){ | |
| var $elem = $(elem); | |
| var $window = $(window); | |
| var docViewTop = $window.scrollTop(); | |
| var docViewBottom = docViewTop + $window.height(); | |
| var elemTop = $elem.offset().top; | |
| var elemBottom = elemTop + $elem.height(); | |
| return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop)); | |
| } | |
| /*usage*/ | |
| if(isScrolledIntoView($('#element'))){ | |
| // The element is visible, do something | |
| $(this).children('span').text('visible'); | |
| } else { | |
| // The element is NOT visible, do something else | |
| $(this).children('span').text('invisible'); | |
| } |
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