diff options
Diffstat (limited to 'static/lazyload.js')
| -rw-r--r-- | static/lazyload.js | 181 |
1 files changed, 1 insertions, 180 deletions
diff --git a/static/lazyload.js b/static/lazyload.js index 6b76a3c..73943af 100644 --- a/static/lazyload.js +++ b/static/lazyload.js @@ -1,180 +1 @@ -/*! - * Lazy Load - JavaScript plugin for lazy loading images - * - * Copyright (c) 2007-2019 Mika Tuupola - * - * Licensed under the MIT license: - * http://www.opensource.org/licenses/mit-license.php - * - * Project home: - * https://appelsiini.net/projects/lazyload - * - * Version: 2.0.0-rc.2 - * - */ - -(function (root, factory) { - if (typeof exports === "object") { - module.exports = factory(root); - } else if (typeof define === "function" && define.amd) { - define([], factory); - } else { - root.LazyLoad = factory(root); - } -}) (typeof global !== "undefined" ? global : this.window || this.global, function (root) { - - "use strict"; - - if (typeof define === "function" && define.amd){ - root = window; - } - - const defaults = { - src: "data-src", - srcset: "data-srcset", - selector: ".lazyload", - root: null, - rootMargin: "0px", - threshold: 0 - }; - - /** - * Merge two or more objects. Returns a new object. - * @private - * @param {Boolean} deep If true, do a deep (or recursive) merge [optional] - * @param {Object} objects The objects to merge together - * @returns {Object} Merged values of defaults and options - */ - const extend = function () { - - let extended = {}; - let deep = false; - let i = 0; - let length = arguments.length; - - /* Check if a deep merge */ - if (Object.prototype.toString.call(arguments[0]) === "[object Boolean]") { - deep = arguments[0]; - i++; - } - - /* Merge the object into the extended object */ - let merge = function (obj) { - for (let prop in obj) { - if (Object.prototype.hasOwnProperty.call(obj, prop)) { - /* If deep merge and property is an object, merge properties */ - if (deep && Object.prototype.toString.call(obj[prop]) === "[object Object]") { - extended[prop] = extend(true, extended[prop], obj[prop]); - } else { - extended[prop] = obj[prop]; - } - } - } - }; - - /* Loop through each object and conduct a merge */ - for (; i < length; i++) { - let obj = arguments[i]; - merge(obj); - } - - return extended; - }; - - function LazyLoad(images, options) { - this.settings = extend(defaults, options || {}); - this.images = images || document.querySelectorAll(this.settings.selector); - this.observer = null; - this.init(); - } - - LazyLoad.prototype = { - init: function() { - - /* Without observers load everything and bail out early. */ - if (!root.IntersectionObserver) { - this.loadImages(); - return; - } - - let self = this; - let observerConfig = { - root: this.settings.root, - rootMargin: this.settings.rootMargin, - threshold: [this.settings.threshold] - }; - - this.observer = new IntersectionObserver(function(entries) { - Array.prototype.forEach.call(entries, function (entry) { - if (entry.isIntersecting) { - self.observer.unobserve(entry.target); - let src = entry.target.getAttribute(self.settings.src); - let srcset = entry.target.getAttribute(self.settings.srcset); - if ("img" === entry.target.tagName.toLowerCase()) { - if (src) { - entry.target.src = src; - } - if (srcset) { - entry.target.srcset = srcset; - } - } else { - entry.target.style.backgroundImage = "url(" + src + ")"; - } - } - }); - }, observerConfig); - - Array.prototype.forEach.call(this.images, function (image) { - self.observer.observe(image); - }); - }, - - loadAndDestroy: function () { - if (!this.settings) { return; } - this.loadImages(); - this.destroy(); - }, - - loadImages: function () { - if (!this.settings) { return; } - - let self = this; - Array.prototype.forEach.call(this.images, function (image) { - let src = image.getAttribute(self.settings.src); - let srcset = image.getAttribute(self.settings.srcset); - if ("img" === image.tagName.toLowerCase()) { - if (src) { - image.src = src; - } - if (srcset) { - image.srcset = srcset; - } - } else { - image.style.backgroundImage = "url('" + src + "')"; - } - }); - }, - - destroy: function () { - if (!this.settings) { return; } - this.observer.disconnect(); - this.settings = null; - } - }; - - root.lazyload = function(images, options) { - return new LazyLoad(images, options); 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