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(function ($) { var selectors = []; var checkBinded = false; var checkLock = false; var defaults = { interval: 250, force_process: false }; var $window = $(window); var $priorAppeared = []; function isAppeared() { return $(this).is(':appeared'); } function isNotTriggered() { return !$(this).data('_appear_triggered'); } function process() { checkLock = false; for (var index = 0, selectorsLength = selectors.length; index < selectorsLength; index++) { var $appeared = $(selectors[index]).filter(isAppeared); $appeared .filter(isNotTriggered) .data('_appear_triggered', true) .trigger('appear', [$appeared]); if ($priorAppeared[index]) { var $disappeared = $priorAppeared[index].not($appeared); $disappeared .data('_appear_triggered', false) .trigger('disappear', [$disappeared]); } $priorAppeared[index] = $appeared; } } function addSelector(selector) { selectors.push(selector); $priorAppeared.push(); } // ":appeared" custom filter $.expr.pseudos.appeared = $.expr.createPseudo(function (_arg) { return function (element) { var $element = $(element); if (!$element.is(':visible')) { return false; } var windowLeft = $window.scrollLeft(); var windowTop = $window.scrollTop(); var offset = $element.offset(); var left = offset.left; var top = offset.top; if (top + $element.height() >= windowTop && top - ($element.data('appear-top-offset') || 0) <= windowTop + $window.height() && left + $element.width() >= windowLeft && left - ($element.data('appear-left-offset') || 0) <= windowLeft + $window.width()) { return true; } return false; }; }); $.fn.extend({ // watching for element's appearance in browser viewport appear: function (selector, options) { $.appear(this, options); return this; } }); $.extend({ appear: function (selector, options) { var opts = $.extend({}, defaults, options || {}); if (!checkBinded) { var onCheck = function () { if (checkLock) { return; } checkLock = true; setTimeout(process, opts.interval); }; $(window).scroll(onCheck).resize(onCheck); checkBinded = true; } if (opts.force_process) { setTimeout(process, opts.interval); } addSelector(selector); }, // force elements's appearance check force_appear: function () { if (checkBinded) { process(); return true; } return false; } }); }(function () { if (typeof module !== 'undefined') { // Node return require('jquery'); } return jQuery; }()));