mirror of
https://github.com/Poniverse/Pony.fm.git
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59 lines
1.9 KiB
JavaScript
59 lines
1.9 KiB
JavaScript
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/*
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* Viewport - jQuery selectors for finding elements in viewport
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*
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* Copyright (c) 2008-2009 Mika Tuupola
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*
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* Licensed under the MIT license:
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* http://www.opensource.org/licenses/mit-license.php
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*
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* Project home:
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* http://www.appelsiini.net/projects/viewport
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*
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*/
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(function($) {
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$.belowthefold = function(element, settings) {
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var fold = $(window).height() + $(window).scrollTop();
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return fold <= $(element).offset().top - settings.threshold;
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};
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$.abovethetop = function(element, settings) {
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var top = $(window).scrollTop();
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return top >= $(element).offset().top + $(element).height() - settings.threshold;
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};
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$.rightofscreen = function(element, settings) {
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var fold = $(window).width() + $(window).scrollLeft();
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return fold <= $(element).offset().left - settings.threshold;
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};
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$.leftofscreen = function(element, settings) {
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var left = $(window).scrollLeft();
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return left >= $(element).offset().left + $(element).width() - settings.threshold;
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};
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$.inviewport = function(element, settings) {
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return !$.rightofscreen(element, settings) && !$.leftofscreen(element, settings) && !$.belowthefold(element, settings) && !$.abovethetop(element, settings);
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};
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$.extend($.expr[':'], {
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"below-the-fold": function(a, i, m) {
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return $.belowthefold(a, {threshold : 0});
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},
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"above-the-top": function(a, i, m) {
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return $.abovethetop(a, {threshold : 0});
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},
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"left-of-screen": function(a, i, m) {
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return $.leftofscreen(a, {threshold : 0});
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},
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"right-of-screen": function(a, i, m) {
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return $.rightofscreen(a, {threshold : 0});
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},
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"in-viewport": function(a, i, m) {
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return $.inviewport(a, {threshold : 0});
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}
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});
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})(jQuery);
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