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/*! Lazy Load XT v1.1.0 2016-01-12
* http://ressio.github.io/lazy-load-xt
* (C) 2016 RESS.io
* Licensed under MIT */
(function ($, window, document, undefined) {
// options
var lazyLoadXT = 'lazyLoadXT',
dataLazied = 'lazied',
load_error = 'load error',
classLazyHidden = 'lazy-hidden',
docElement = document.documentElement || document.body,
// force load all images in Opera Mini and some mobile browsers without scroll event or getBoundingClientRect()
forceLoad = (window.onscroll === undefined || !!window.operamini || !docElement.getBoundingClientRect),
options = {
autoInit: true, // auto initialize in $.ready
selector: 'img[data-src]', // selector for lazyloading elements
blankImage: 'data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7',
throttle: 99, // interval (ms) for changes check
forceLoad: forceLoad, // force auto load all images
loadEvent: 'pageshow', // check AJAX-loaded content in jQueryMobile
updateEvent: 'load orientationchange resize scroll touchmove focus', // page-modified events
forceEvent: 'lazyloadall', // force loading of all elements
//onstart: null,
oninit: {removeClass: 'lazy'}, // init handler
onshow: {addClass: classLazyHidden}, // start loading handler
onload: {removeClass: classLazyHidden, addClass: 'lazy-loaded'}, // load success handler
onerror: {removeClass: classLazyHidden}, // error handler
//oncomplete: null, // complete handler
//scrollContainer: undefined,
checkDuplicates: true
},
elementOptions = {
srcAttr: 'data-src',
edgeX: 0,
edgeY: 0,
visibleOnly: true
},
$window = $(window),
$isFunction = $.isFunction,
$extend = $.extend,
$data = $.data || function (el, name) {
return $(el).data(name);
},
elements = [],
topLazy = 0,
/*
waitingMode=0 : no setTimeout
waitingMode=1 : setTimeout, no deferred events
waitingMode=2 : setTimeout, deferred events
*/
waitingMode = 0;
$[lazyLoadXT] = $extend(options, elementOptions, $[lazyLoadXT]);
/**
* Return options.prop if obj.prop is undefined, otherwise return obj.prop
* @param {*} obj
* @param {*} prop
* @returns *
*/
function getOrDef(obj, prop) {
return obj[prop] === undefined ? options[prop] : obj[prop];
}
/**
* @returns {number}
*/
function scrollTop() {
var scroll = window.pageYOffset;
return (scroll === undefined) ? docElement.scrollTop : scroll;
}
/**
* Add new elements to lazy-load list:
* $(elements).lazyLoadXT() or $(window).lazyLoadXT()
*
* @param {object} [overrides] override global options
*/
$.fn[lazyLoadXT] = function (overrides) {
overrides = overrides || {};
var blankImage = getOrDef(overrides, 'blankImage'),
checkDuplicates = getOrDef(overrides, 'checkDuplicates'),
scrollContainer = getOrDef(overrides, 'scrollContainer'),
forceShow = getOrDef(overrides, 'show'),
elementOptionsOverrides = {},
prop;
// empty overrides.scrollContainer is supported by both jQuery and Zepto
$(scrollContainer).on('scroll', queueCheckLazyElements);
for (prop in elementOptions) {
elementOptionsOverrides[prop] = getOrDef(overrides, prop);
}
return this.each(function (index, el) {
if (el === window) {
$(options.selector).lazyLoadXT(overrides);
} else {
var duplicate = checkDuplicates && $data(el, dataLazied),
$el = $(el).data(dataLazied, forceShow ? -1 : 1);
// prevent duplicates
if (duplicate) {
queueCheckLazyElements();
return;
}
if (blankImage && el.tagName === 'IMG' && !el.src) {
el.src = blankImage;
}
// clone elementOptionsOverrides object
$el[lazyLoadXT] = $extend({}, elementOptionsOverrides);
triggerEvent('init', $el);
elements.push($el);
queueCheckLazyElements();
}
});
};
/**
* Process function/object event handler
* @param {string} event suffix
* @param {jQuery} $el
*/
function triggerEvent(event, $el) {
var handler = options['on' + event];
if (handler) {
if ($isFunction(handler)) {
handler.call($el[0]);
} else {
if (handler.addClass) {
$el.addClass(handler.addClass);
}
if (handler.removeClass) {
$el.removeClass(handler.removeClass);
}
}
}
$el.trigger('lazy' + event, [$el]);
// queue next check as images may be resized after loading of actual file
queueCheckLazyElements();
}
/**
* Trigger onload/onerror handler
* @param {Event} e
*/
function triggerLoadOrError(e) {
triggerEvent(e.type, $(this).off(load_error, triggerLoadOrError));
}
/**
* Load visible elements
* @param {bool} [force] loading of all elements
*/
function checkLazyElements(force) {
if (!elements.length) {
return;
}
force = force || options.forceLoad;
topLazy = Infinity;
var viewportTop = scrollTop(),
viewportHeight = window.innerHeight || docElement.clientHeight,
viewportWidth = window.innerWidth || docElement.clientWidth,
i,
length;
for (i = 0, length = elements.length; i < length; i++) {
var $el = elements[i],
el = $el[0],
objData = $el[lazyLoadXT],
removeNode = false,
visible = force || $data(el, dataLazied) < 0,
topEdge;
// remove items that are not in DOM
if (!$.contains(docElement, el)) {
removeNode = true;
} else if (force || !objData.visibleOnly || el.offsetWidth || el.offsetHeight) {
if (!visible) {
var elPos = el.getBoundingClientRect(),
edgeX = objData.edgeX,
edgeY = objData.edgeY;
topEdge = (elPos.top + viewportTop - edgeY) - viewportHeight;
visible = (topEdge <= viewportTop && elPos.bottom > -edgeY &&
elPos.left <= viewportWidth + edgeX && elPos.right > -edgeX);
}
if (visible) {
$el.on(load_error, triggerLoadOrError);
triggerEvent('show', $el);
var srcAttr = objData.srcAttr,
src = $isFunction(srcAttr) ? srcAttr($el) : el.getAttribute(srcAttr);
if (src) {
el.src = src;
}
removeNode = true;
} else {
if (topEdge < topLazy) {
topLazy = topEdge;
}
}
}
if (removeNode) {
$data(el, dataLazied, 0);
elements.splice(i--, 1);
length--;
}
}
if (!length) {
triggerEvent('complete', $(docElement));
}
}
/**
* Run check of lazy elements after timeout
*/
function timeoutLazyElements() {
if (waitingMode > 1) {
waitingMode = 1;
checkLazyElements();
setTimeout(timeoutLazyElements, options.throttle);
} else {
waitingMode = 0;
}
}
/**
* Queue check of lazy elements because of event e
* @param {Event} [e]
*/
function queueCheckLazyElements(e) {
if (!elements.length) {
return;
}
// fast check for scroll event without new visible elements
if (e && e.type === 'scroll' && e.currentTarget === window) {
if (topLazy >= scrollTop()) {
return;
}
}
if (!waitingMode) {
setTimeout(timeoutLazyElements, 0);
}
waitingMode = 2;
}
/**
* Initialize list of hidden elements
*/
function initLazyElements() {
$window.lazyLoadXT();
}
/**
* Loading of all elements
*/
function forceLoadAll() {
checkLazyElements(true);
}
/**
* Initialization
*/
$(document).ready(function () {
triggerEvent('start', $window);
$window
.on(options.updateEvent, queueCheckLazyElements)
.on(options.forceEvent, forceLoadAll);
$(document).on(options.updateEvent, queueCheckLazyElements);
if (options.autoInit) {
$window.on(options.loadEvent, initLazyElements);
initLazyElements(); // standard initialization
}
});
})(window.jQuery || window.Zepto || window.$, window, document);
(function ($) {
var options = $.lazyLoadXT;
options.selector += ',video,iframe[data-src],embed[data-src]';
options.videoPoster = 'data-poster';
$(document).on('lazyshow', 'video', function (e, $el) {
var srcAttr = $el.lazyLoadXT.srcAttr,
isFuncSrcAttr = $.isFunction(srcAttr),
changed = false;
$el.attr('poster', $el.attr(options.videoPoster));
$el.children('source,track')
.each(function (index, el) {
var $child = $(el),
src = isFuncSrcAttr ? srcAttr($child) : $child.attr(srcAttr);
if (src) {
$child.attr('src', src);
changed = true;
}
});
// reload video
if (changed && typeof $(this).attr('preload') !== 'undefined' && 'none' != $(this).attr('preload') ) {
this.load();
}
$(this).removeClass('lazy-hidden');
});
$(document).on('lazyshow', 'embed', function (e, $el) {
$(this).removeClass('lazy-hidden');
});
})(window.jQuery || window.Zepto || window.$);