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var $ = require('jquery');
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(function($, window, document, undefined) {
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var $window = $(window);
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$.fn.lazyload = function(options) {
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var elements = this;
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var $container;
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var settings = {
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threshold : 0,
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failure_limit : 0,
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event : "scroll",
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effect : "show",
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container : window,
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data_attribute : "original",
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skip_invisible : true,
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appear : null,
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load : null,
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yasPath: '/web/',
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yasImgDomain: 'http://analytics.yhurl.com/yas.gif',
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placeholder : "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC",
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try_again_css: null
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};
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function update() {
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var counter = 0;
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elements.each(function() {
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var $this = $(this);
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if (settings.skip_invisible && !$this.is(":visible")) {
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return;
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}
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if ($.abovethetop(this, settings) ||
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$.leftofbegin(this, settings)) {
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/* Nothing. */
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} else if (!$.belowthefold(this, settings) &&
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!$.rightoffold(this, settings)) {
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$this.trigger("appear");
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/* if we found an image we'll load, reset the counter */
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counter = 0;
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} else {
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if (++counter > settings.failure_limit) {
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return false;
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}
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}
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});
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};
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//add by jp, 发送图片方式跨域发送消息
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function crossSend(param, callback) {
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var image = new Image(1, 1);
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image.src = settings.yasImgDomain + settings.yasPath + '?' + param;
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image.onload = function() {
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image.onload = null;
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if (callback) {
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callback();
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}
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};
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};
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if(options) {
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/* Maintain BC for a couple of versions. */
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if (undefined !== options.failurelimit) {
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options.failure_limit = options.failurelimit;
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delete options.failurelimit;
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}
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if (undefined !== options.effectspeed) {
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options.effect_speed = options.effectspeed;
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delete options.effectspeed;
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}
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$.extend(settings, options);
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}
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/* Cache container as jQuery as object. */
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$container = (settings.container === undefined ||
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settings.container === window) ? $window : $(settings.container);
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/* Fire one scroll event per scroll. Not one scroll event per image. */
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if (0 === settings.event.indexOf("scroll")) {
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$container.bind(settings.event, function() {
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return update();
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});
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}
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this.each(function() {
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var self = this;
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var $self = $(self);
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self.loaded = false;
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/* If no src attribute given use data:uri. */
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if ($self.attr("src") === undefined || $self.attr("src") === false || $self.attr("src") === '') {
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if ($self.is("img")) {
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$self.attr("src", settings.placeholder);
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}
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}
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/* When appear is triggered load original image. */
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$self.one("appear", function() {
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//add by jp
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if($self.timerid) clearTimeout($self.timerid);
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//console.log("img appear, this.loaded:" + this.loaded + ", id:" + $self.attr("id"));
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if (!this.loaded) {
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if (settings.appear) {
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var elements_left = elements.length;
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settings.appear.call(self, elements_left, settings);
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}
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$("<img />")
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//add by jp
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.bind("error abort", function(){
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$self.attr("src",settings.placeholder);
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loadfail({info:'error'});
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})
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.bind("load", function() {
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//add by jp, 加载超时后，不再进行加载，通过传统方式设置src，边下载边渲染
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if($self.loadtimeout){
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return;
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}
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//add by jp, 清理检测图片下载超时定时器
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clearTimeout($self.timerid);
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//add by jp, 上报图片加载成功事件
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if( $self.attr("pfmrpt") ){
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//crossImgSend('success');
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}
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var original = $self.attr("data-" + settings.data_attribute);
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$self.hide();
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if ($self.is("img")) {
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$self.attr("src", original);
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} else {
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$self.css("background-image", "url('" + original + "')");
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}
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$self[settings.effect](settings.effect_speed);
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self.loaded = true;
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/* Remove image from array so it is not looped next time. */
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var temp = $.grep(elements, function(element) {
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return !element.loaded;
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});
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elements = $(temp);
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if (settings.load) {
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var elements_left = elements.length;
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settings.load.call(self, elements_left, settings);
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}
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})
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.attr("src", $self.attr("data-" + settings.data_attribute));
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//add by jp , 临时保存图片url
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$self.src = $self.attr("data-" + settings.data_attribute);
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//add by jp , 上报图片开始加载事件
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if( $self.attr("pfmrpt") && _yas && _yas.add){
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//crossImgSend(,'start');
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}
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//add by jp, 图片加载失败或超时的处理
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var loadtimeout = function(options){
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//记录标识图片加载超时
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$self.loadtimeout = true;
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//上报图片加载超时事件
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if( $self.attr("pfmrpt") && _yas && _yas.add){
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options.info ; //error or timeout
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//crossImgSend(settings.yasImgDomain,settings.yasPath,'fail');
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}
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//清除图片src取值，便于图片边下载边渲染
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$self.attr("src","");
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setTimeout(function(){
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$self.attr("src",$self.src);
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},50);
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};
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//add by jp, 图片加载失败或超时的处理
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var loadfail = function(options){
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//记录标识图片加载超时
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$self.loadtimeout = true;
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//上报图片加载失败事件
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if( $self.attr("pfmrpt") && _yas && _yas.add){
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options.info ; //error or timeout
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//crossImgSend(settings.yasImgDomain,settings.yasPath,'fail');
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}
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var width = $self.width();
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var height = $self.height();
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var $tryagain = $("<div class="+settings.try_again_css+" style='background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC) ;text-align: center;position:relative;width:"+width+"px;height:"+height+"px; line-height:"+height+"px'>图片打开失败,点击重新加载</div>");
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// $tryagain.css("background-image",settings.placeholder);
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$self.replaceWith($tryagain);
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$tryagain.bind("click", function(){
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$tryagain.replaceWith($self);
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//清除图片src取值，便于图片边下载边渲染
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$self.attr("src","");
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setTimeout(function(){
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$self.attr("src",$self.src);
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},50);
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});
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};
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//图片下载超时检测
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$self.timerid = setTimeout(loadtimeout,3000);
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}
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});
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/* When wanted event is triggered load original image */
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/* by triggering appear. */
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if (0 !== settings.event.indexOf("scroll")) {
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$self.bind(settings.event, function() {
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if (!self.loaded) {
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$self.trigger("appear");
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}
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});
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}
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});
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/* Check if something appears when window is resized. */
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$window.bind("resize", function() {
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update();
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});
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/* With IOS5 force loading images when navigating with back button. */
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/* Non optimal workaround. */
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if ((/(?:iphone|ipod|ipad).*os 5/gi).test(navigator.appVersion)) {
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$window.bind("pageshow", function(event) {
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if (event.originalEvent && event.originalEvent.persisted) {
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elements.each(function() {
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$(this).trigger("appear");
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});
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}
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});
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}
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/* Force initial check if images should appear. */
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$(document).ready(function() {
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update();
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});
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return this;
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};
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/* Convenience methods in jQuery namespace. */
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/* Use as $.belowthefold(element, {threshold : 100, container : window}) */
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$.belowthefold = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = (window.innerHeight ? window.innerHeight : $window.height()) + $window.scrollTop();
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} else {
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fold = $(settings.container).offset().top + $(settings.container).height();
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}
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return fold <= $(element).offset().top - settings.threshold;
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};
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$.rightoffold = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.width() + $window.scrollLeft();
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} else {
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fold = $(settings.container).offset().left + $(settings.container).width();
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}
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return fold <= $(element).offset().left - settings.threshold;
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};
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$.abovethetop = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.scrollTop();
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} else {
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fold = $(settings.container).offset().top;
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}
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return fold >= $(element).offset().top + settings.threshold + $(element).height();
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};
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$.leftofbegin = function(element, settings) {
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var fold;
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if (settings.container === undefined || settings.container === window) {
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fold = $window.scrollLeft();
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} else {
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fold = $(settings.container).offset().left;
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}
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return fold >= $(element).offset().left + settings.threshold + $(element).width();
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};
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$.inviewport = function(element, settings) {
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return !$.rightoffold(element, settings) && !$.leftofbegin(element, settings) &&
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!$.belowthefold(element, settings) && !$.abovethetop(element, settings);
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};
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})($, window, document); |
...
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...
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