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118 lines
2.5 KiB
JavaScript
118 lines
2.5 KiB
JavaScript
/**
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* jQuery Unveil
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* A very lightweight jQuery plugin to lazy load images
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* http://luis-almeida.github.com/unveil
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*
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* Licensed under the MIT license.
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* Copyright 2013 Luís Almeida
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* https://github.com/luis-almeida
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*/
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(function ($) {
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var unveilId = 0;
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function getThreshold() {
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if (window.AppInfo && AppInfo.hasLowImageBandwidth) {
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return 0;
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}
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// Test search before setting to 0
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return 100;
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}
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$.fn.unveil = function () {
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var $w = $(window),
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th = getThreshold(),
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attrib = "data-src",
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images = this,
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loaded;
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unveilId++;
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var eventNamespace = 'unveil' + unveilId;
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this.one("unveil", function () {
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var elem = this;
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var source = elem.getAttribute(attrib);
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if (source) {
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ImageStore.setImageInto(elem, source);
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elem.setAttribute("data-src", '');
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}
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});
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function unveil() {
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var inview = images.filter(function () {
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var $e = $(this);
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if ($e.is(":hidden")) return;
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var wt = $w.scrollTop(),
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wb = wt + $w.height(),
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et = $e.offset().top,
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eb = et + $e.height();
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return eb >= wt - th && et <= wb + th;
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});
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loaded = inview.trigger("unveil");
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images = images.not(loaded);
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if (!images.length) {
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$w.off('scroll.' + eventNamespace);
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$w.off('resize.' + eventNamespace);
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}
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}
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$w.on('scroll.' + eventNamespace, unveil);
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$w.on('resize.' + eventNamespace, unveil);
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unveil();
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return this;
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};
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$.fn.lazyChildren = function () {
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var lazyItems = $(".lazy", this);
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if (lazyItems.length) {
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lazyItems.unveil();
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}
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return this;
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};
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$.fn.lazyImage = function (url) {
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return this.attr('data-src', url).unveil();
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};
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})(window.jQuery || window.Zepto);
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(function () {
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function setImageIntoElement(elem, url) {
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if (elem.tagName === "DIV") {
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elem.style.backgroundImage = "url('" + url + "')";
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} else {
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elem.setAttribute("src", url);
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}
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}
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function simpleImageStore() {
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var self = this;
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self.setImageInto = setImageIntoElement;
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}
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console.log('creating simpleImageStore');
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window.ImageStore = new simpleImageStore();
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})(); |