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jumplee/isScrolledIntoView.js

Created July 23, 2015 09:40
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  1. jumplee renamed this gist Jul 23, 2015. 1 changed file with 0 additions and 0 deletions.
    0 元素是否在屏幕内.js → isScrolledIntoView.js
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    File renamed without changes.
  2. jumplee created this gist Jul 23, 2015.
    13 changes: 13 additions & 0 deletions 元素是否在屏幕内.js
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    Original file line number Diff line number Diff line change
    @@ -0,0 +1,13 @@
    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));
    }