js 页面图片等元素在普通元素中滚动动态加载技术

/*! * 2012-01-13 v1.1 偏移值计算修改 position → offset * 2012-09-25 v1.2 增加滚动容器参数, 回调参数 * 2015-11-17 v1.3 只对显示元素进行处理*/(function($) {$.fn.scrollLoading = function(options) {var defaults = {attr: "data-url",container: $(window),callback: $.noop};var params = $.extend({}, defaults, options || {});params.cache = [];$(this).each(function() {var node = this.nodeName.toLowerCase(), url = $(this).attr(params["attr"]);//重组var data = {obj: $(this),tag: node,url: url};params.cache.push(data);});var callback = function(call) {if ($.isFunction(params.callback)) {params.callback.call(call.get(0));}};//动态显示数据var loading = function() {var contHeight = params.container.height();if ($(window).get(0) === window) {contop = $(window).scrollTop();} else {contop = params.container.offset().top;}$.each(params.cache, function(i, data) {var o = data.obj, tag = data.tag, url = data.url, post, posb;if (o) {post = o.offset().top - contop, post + o.height();if (o.is(‘:visible‘) && (post >= 0 && post < contHeight) || (posb > 0 && posb <= contHeight)) {if (url) {//在浏览器窗口内if (tag === "img") {//图片，改变srccallback(o.attr("src", url));} else {o.load(url, {}, function() {callback(o);});}} else {// 无地址，直接触发回调callback(o);}data.obj = null;}}});};//事件触发//加载完毕即执行loading();//滚动执行params.container.bind("scroll", loading);};})(jQuery);


//实例

<script>
 ???var tempHTML = "";
 ???for (var i=1; i<=30; i+=1) {
 ???????if (i == 6) {
 ???????????tempHTML += ‘<div class="zxx_test_list scrollLoading" data-url="loaded.html"><div style="padding:100px 0; text-align:center;"><img src="/study/image/loading.gif" style="margin:0 8px -8px 0;" />加载中...</div></div>‘;
 ???????} else {
 ???????????tempHTML += ‘<div class="zxx_test_list tc"><img class="scrollLoading" data-url="//image.zhangxinxu.com/image/study/head/s180/‘+i+‘.jpeg" src="//s1.xiaomishu.com/b/img/pixel.gif" width="180" height="180" style="background:url(/study/image/loading.gif) no-repeat center;" /><br />图片‘+i+‘(新浪微博提供)</div>‘;
 ???????}
 ???}
 ???tempHTML += ‘<div class="zxx_test_list tc"><h6>下面藏了一张图片，<a href="javascript:" id="zxxClickBtn">点击显示</a></h6>\
 ???????<div id="zxxShow" style="display:none;">\
 ??????????<img class="scrollLoading" width="256" height="191" data-url="//image.zhangxinxu.com/image/study/s/s256/mm1.jpg" />\
 ???????</div></div>‘;
 ???document.getElementById("zxxMainCon").innerHTML = tempHTML;
</script>

<script>
 ???$(function() {
 ???????$(".scrollLoading").scrollLoading({
 ???????????container: $("#zxxMainCon"),
 ???????????callback: function() {
 ???????????????this.style.border = "3px solid #a0b3d6";
 ???????????}
 ???????});

 ???????//$(".scrollLoading").scrollLoading();
 ???????
 ???});
</script>

js 页面图片等元素在普通元素中滚动动态加载技术

原文地址：https://www.cnblogs.com/xieyongbin/p/10324313.html