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jquery.viewport.js
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jquery.viewport.js
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/*
* Viewport - jQuery selectors for finding elements in viewport
*
* Copyright (c) 2008 Mika Tuupola
*
* Licensed under the MIT license:
* http://www.opensource.org/licenses/mit-license.php
*
* Revision: $Id$
*
*/
(function($) {
$.belowthefold = function(element, settings) {
var fold = $(window).height() + $(window).scrollTop();
return fold <= $(element).offset().top - settings.threshold;
};
$.abovethetop = function(element, settings) {
var top = $(window).scrollTop();
return top >= $(element).offset().top + $(element).height() - settings.threshold;
};
$.rightofscreen = function(element, settings) {
var fold = $(window).width() + $(window).scrollLeft();
return fold <= $(element).offset().left - settings.threshold;
};
$.leftofscreen = function(element, settings) {
var left = $(window).scrollLeft();
return left >= $(element).offset().left + $(element).width() - settings.threshold;
};
$.inviewport = function(element, settings) {
return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) && !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
};
$.extend($.expr[':'], {
"below-the-fold" : "$.belowthefold(a, {threshold : 0})",
"above-the-top" : "$.abovethetop(a, {threshold : 0})",
"left-of-screen" : "$.leftofscreen(a, {threshold : 0})",
"right-of-screen" : "$.rightofscreen(a, {threshold : 0})",
"in-viewport" : "$.inviewport(a, {threshold : 0})"
});
})(jQuery);