/*
 * jquery.scrollLoading.js
 * by zhangxinxu  http://www.zhangxinxu.com
 * 2010-11-19 v1.0
*/
(function ($) { $.fn.scrollLoading = function (options) { var defaults = { attr: "data-url" }; var params = $.extend({}, defaults, options || {}); params.cache = []; $(this).each(function () { var node = this.nodeName.toLowerCase(), url = $(this).attr(params["attr"]); if (!url) { return }; var data = { obj: $(this), tag: node, url: url }; params.cache.push(data) }); var loading = function () { var st = $(window).scrollTop(), sth = st + $(window).height(); $.each(params.cache, function (i, data) { var o = data.obj, tag = data.tag, url = data.url; if (o) { post = o.position().top; posb = post + o.height(); if ((post > st && post < sth) || (posb > st && posb < sth)) { if (tag === "img") { o.attr("src", url) } else { o.load(url) }; data.obj = null } } }); return false }; loading(); $(window).bind("scroll", loading) } })(jQuery);