jail.min.js

/*
*  JAIL: jQuery Asynchronous Image Loader
*
* Copyright (c) 2011 Sebastiano Armeli-Battana (http://www.sebastianoarmelibattana.com)
*
* By Sebastiano Armeli-Battana (@sebarmeli) - http://www.sebastianoarmelibattana.com
* Licensed under the MIT license.
* https://github.com/sebarmeli/JAIL/blob/master/MIT-LICENSE.txt
*
* Tested with jQuery 1.3.2+ on FF 2+, Opera 10+, Safari 4+, Chrome 8+ on Win/Mac/Linux and IE 6/7/8 on Win.
*
* Contributor : Derek Lindahl - dlindahl
*
* @link http://github.com/sebarmeli/JAIL
* @author Sebastiano Armeli-Battana
* @date 30/12/2011
* @version 0.9.9
*
*/
;(function(a,c){var b=c(jQuery),d=typeof define==="function"&&define.amd;if(d){define("jail",["jquery"],b)}else{(this.jQuery||this.$||this)[a]=b}}("jail",function(f){var b=f(window),d={timeout:1,effect:false,speed:400,triggerElement:null,offset:0,event:"load",callback:null,callbackAfterEachImage:null,placeholder:false,loadHiddenImages:false},k=[],g=false;f.jail=function(o,n){var o=o||{},n=f.extend({},d,n);f.jail.prototype.init(o,n);if(/^(load|scroll)/.test(n.event)){f.jail.prototype.later.call(o,n)}else{f.jail.prototype.onEvent.call(o,n)}};f.jail.prototype.init=function(o,n){o.data("triggerEl",(n.triggerElement)?f(n.triggerElement):b);if(!!n.placeholder){o.each(function(){f(this).attr("src",n.placeholder)})}};f.jail.prototype.onEvent=function(o){var n=this;if(!!o.triggerElement){i(o,n)}else{n.bind(o.event,{options:o,images:n},function(s){var r=f(this),q=s.data.options,p=s.data.images;k=f.extend({},p);a(q,r);f(s.currentTarget).unbind(s.type)})}};f.jail.prototype.later=function(o){var n=this;setTimeout(function(){k=f.extend({},n);n.each(function(){c(o,this,n)});o.event="scroll";i(o,n)},o.timeout)};function i(o,n){if(!!n){var p=n.data("triggerEl")}if(!!p&&typeof p.bind==="function"){p.bind(o.event,{options:o,images:n},m);b.resize({options:o,images:n},m)}}function j(n){var o=0;if(n.length>0){while(true){if(o===n.length){break}else{if(n[o].getAttribute("data-src")){o++}else{n.splice(o,1)}}}}}function m(p){var n=p.data.images,o=p.data.options;n.data("poller",setTimeout(function(){k=f.extend({},n);j(k);f(k).each(function(){if(this===window){return}c(o,this,k)});if(l(k)){f(p.currentTarget).unbind(p.type);return}else{if(o.event!=="scroll"){var q=(/scroll/i.test(o.event))?n.data("triggerEl"):b;o.event="scroll";n.data("triggerEl",q);i(o,f(k))}}},o.timeout))}function l(n){var o=true;f(n).each(function(){if(!!f(this).attr("data-src")){o=false}});return o}function c(q,s,o){var r=f(s),p=(/scroll/i.test(q.event))?o.data("triggerEl"):b,n=true;if(!q.loadHiddenImages){n=h(r,p,q)&&r.is(":visible")}if(n&&e(p,r,q.offset)){a(q,r)}}function e(u,n,s){var q=u[0]===window,y=(q?{top:0,left:0}:u.offset()),r=y.top+(q?u.scrollTop():0),t=y.left+(q?u.scrollLeft():0),p=t+u.width(),v=r+u.height(),x=n.offset(),w=n.width(),o=n.height();return(r-s)<=(x.top+o)&&(v+s)>=x.top&&(t-s)<=(x.left+w)&&(p+s)>=x.left}function a(n,o){o.hide();o.attr("src",o.attr("data-src"));o.removeAttr("data-src");if(n.effect){if(n.speed){o[n.effect](n.speed)}else{o[n.effect]()}o.css("opacity",1);o.show()}else{o.show()}j(k);if(!!n.callbackAfterEachImage){n.callbackAfterEachImage.call(this,o,n)}if(l(k)&&!!n.callback&&!g){n.callback.call(f.jail,n);g=true}}function h(q,o,p){var r=q.parent(),n=true;while(r.length&&r.get(0).nodeName.toUpperCase()!=="BODY"){if(r.css("overflow")==="hidden"){if(!e(r,q,p.offset)){n=false;break}}else{if(r.css("overflow")==="scroll"){if(!e(r,q,p.offset)){n=false;f(k).data("triggerEl",r);p.event="scroll";i(p,f(k));break}}}if(r.css("visibility")==="hidden"||q.css("visibility")==="hidden"){n=false;break}if(o!==b&&r===o){break}r=r.parent()}return n}f.fn.jail=function(n){new f.jail(this,n);k=[];return this};return f.jail}));