Rinser/html/js/jquery.unveil.js

/**
 * jQuery Unveil
 * A very lightweight jQuery plugin to lazy load images
 * http://luis-almeida.github.com/unveil
 *
 * Licensed under the MIT license.
 * Copyright 2013 Luís Almeida
 * https://github.com/luis-almeida
 */

;
(function($) {
  var isMobile = false; //initiate as false
// device detection
  if(/(android|bb\d+|meego).+mobile|avantgo|bada\/|blackberry|blazer|compal|elaine|fennec|hiptop|iemobile|ip(hone|od)|ipad|iris|kindle|Android|Silk|lge |maemo|midp|mmp|netfront|opera m(ob|in)i|palm( os)?|phone|p(ixi|re)\/|plucker|pocket|psp|series(4|6)0|symbian|treo|up\.(browser|link)|vodafone|wap|windows (ce|phone)|xda|xiino/i.test(navigator.userAgent)
    || /1207|6310|6590|3gso|4thp|50[1-6]i|770s|802s|a wa|abac|ac(er|oo|s\-)|ai(ko|rn)|al(av|ca|co)|amoi|an(ex|ny|yw)|aptu|ar(ch|go)|as(te|us)|attw|au(di|\-m|r |s )|avan|be(ck|ll|nq)|bi(lb|rd)|bl(ac|az)|br(e|v)w|bumb|bw\-(n|u)|c55\/|capi|ccwa|cdm\-|cell|chtm|cldc|cmd\-|co(mp|nd)|craw|da(it|ll|ng)|dbte|dc\-s|devi|dica|dmob|do(c|p)o|ds(12|\-d)|el(49|ai)|em(l2|ul)|er(ic|k0)|esl8|ez([4-7]0|os|wa|ze)|fetc|fly(\-|_)|g1 u|g560|gene|gf\-5|g\-mo|go(\.w|od)|gr(ad|un)|haie|hcit|hd\-(m|p|t)|hei\-|hi(pt|ta)|hp( i|ip)|hs\-c|ht(c(\-| |_|a|g|p|s|t)|tp)|hu(aw|tc)|i\-(20|go|ma)|i230|iac( |\-|\/)|ibro|idea|ig01|ikom|im1k|inno|ipaq|iris|ja(t|v)a|jbro|jemu|jigs|kddi|keji|kgt( |\/)|klon|kpt |kwc\-|kyo(c|k)|le(no|xi)|lg( g|\/(k|l|u)|50|54|\-[a-w])|libw|lynx|m1\-w|m3ga|m50\/|ma(te|ui|xo)|mc(01|21|ca)|m\-cr|me(rc|ri)|mi(o8|oa|ts)|mmef|mo(01|02|bi|de|do|t(\-| |o|v)|zz)|mt(50|p1|v )|mwbp|mywa|n10[0-2]|n20[2-3]|n30(0|2)|n50(0|2|5)|n7(0(0|1)|10)|ne((c|m)\-|on|tf|wf|wg|wt)|nok(6|i)|nzph|o2im|op(ti|wv)|oran|owg1|p800|pan(a|d|t)|pdxg|pg(13|\-([1-8]|c))|phil|pire|pl(ay|uc)|pn\-2|po(ck|rt|se)|prox|psio|pt\-g|qa\-a|qc(07|12|21|32|60|\-[2-7]|i\-)|qtek|r380|r600|raks|rim9|ro(ve|zo)|s55\/|sa(ge|ma|mm|ms|ny|va)|sc(01|h\-|oo|p\-)|sdk\/|se(c(\-|0|1)|47|mc|nd|ri)|sgh\-|shar|sie(\-|m)|sk\-0|sl(45|id)|sm(al|ar|b3|it|t5)|so(ft|ny)|sp(01|h\-|v\-|v )|sy(01|mb)|t2(18|50)|t6(00|10|18)|ta(gt|lk)|tcl\-|tdg\-|tel(i|m)|tim\-|t\-mo|to(pl|sh)|ts(70|m\-|m3|m5)|tx\-9|up(\.b|g1|si)|utst|v400|v750|veri|vi(rg|te)|vk(40|5[0-3]|\-v)|vm40|voda|vulc|vx(52|53|60|61|70|80|81|83|85|98)|w3c(\-| )|webc|whit|wi(g |nc|nw)|wmlb|wonu|x700|yas\-|your|zeto|zte\-/i.test(navigator.userAgent.substr(0,4))) isMobile = true;
        var blackList = ['feeds.feedburner.com', '.feedsportal.co'];
        $.fn.unveil = function(threshold, callback) {

            var $w = $(window),
                th = threshold || 0,
                retina = window.devicePixelRatio > 1,
                attrib = retina ? "data-src-retina" : "data-src",
                images = this,
                loaded;

          var fixer = (isMobile) ? '365,fit,q65/' : '1140,fit,q80/';

          var urlPrefix = 'http://image.silvrtree.co.uk/' + fixer;

            this.one("unveil", function() {
                    var source = this.getAttribute(attrib);
                    source = source || this.getAttribute("data-src");

                    var flag = false;
                    for (var item in blackList) {
                        var u = blackList[item];
                        if (source.indexOf(u) !== -1) {
                                flag = true;
                            }
                        }

                        if (source && !flag) {

                          if (!S(source).startsWith('http')) {
                            source = 'http://' + S(source).stripLeft('/').s;
                               }
                          source = urlPrefix + source;

                            this.setAttribute("src", source);
                            if (typeof callback === "function") callback.call(this);
                        }

                        if (flag) {
                            this.setAttribute("style", 'display:none !important;');
                        }
                    });

                function unveil() {
                    var inview = images.filter(function() {
                        var $e = $(this);
                        //    if ($e.is(":hidden")) return;

                        var wt = $w.scrollTop(),
                            wb = wt + $w.height(),
                            et = $e.offset().top,
                            eb = et + $e.height();

                        return eb >= wt - th && et <= wb + th;
                    });

                    loaded = inview.trigger("unveil");
                    images = images.not(loaded);
                }

                $w.on("scroll.unveil resize.unveil lookup.unveil", unveil);

                unveil();

                return this;

            };

        })(window.jQuery || window.Zepto);