implementacion de carga dinamica de imagenes con lazy loading

index.php

@@ -718,11 +718,12 @@ legend.legend-area {
     <script src="./librerias/bootstrap/js/bootstrap.min.js" ></script>
         <script src="./librerias/charts/Chart.bundle.js"></script>
     <script src="./librerias/charts/utils.js"></script>
+    <script src="./librerias/lazy/jquery.lazy.min.js"></script>
 
 	<!-- morris  -->
- <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css">
+<!--  <link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.css"> -->
- <script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script>
+<!--  <script src="//cdnjs.cloudflare.com/ajax/libs/raphael/2.1.0/raphael-min.js"></script> -->
- <script src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script>
+<!--  <script src="//cdnjs.cloudflare.com/ajax/libs/morris.js/0.5.1/morris.min.js"></script> -->
 <!-- morris  -->
 
 <style>
@@ -1186,6 +1187,9 @@ $eventos= "
 <?php } ?>
 
     <script type="text/javascript">
+$(function() {
+        $('.lazy').Lazy();
+    });
 
 $(document).delegate('*[data-toggle="lightbox"]', 'click', function(event) {
     event.preventDefault();

librerias/lazy/jquery.lazy.js

@@ -0,0 +1,870 @@
+/*!
+ * jQuery & Zepto Lazy - v1.7.6
+ * http://jquery.eisbehr.de/lazy/
+ *
+ * Copyright 2012 - 2017, Daniel 'Eisbehr' Kern
+ *
+ * Dual licensed under the MIT and GPL-2.0 licenses:
+ * http://www.opensource.org/licenses/mit-license.php
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * $("img.lazy").lazy();
+ */
+
+;(function(window, undefined) {
+    "use strict";
+
+    // noinspection JSUnresolvedVariable
+    /**
+     * library instance - here and not in construct to be shorter in minimization
+     * @return void
+     */
+    var $ = window.jQuery || window.Zepto,
+
+    /**
+     * unique plugin instance id counter
+     * @type {number}
+     */
+    lazyInstanceId = 0,
+
+    /**
+     * helper to register window load for jQuery 3
+     * @type {boolean}
+     */    
+    windowLoaded = false;
+
+    /**
+     * make lazy available to jquery - and make it a bit more case-insensitive :)
+     * @access public
+     * @type {function}
+     * @param {object} settings
+     * @return void
+     */
+    $.fn.Lazy = $.fn.lazy = function(settings) {
+        return new LazyPlugin(this, settings);
+    };
+
+    /**
+     * helper to add plugins to lazy prototype configuration
+     * @access public
+     * @type {function}
+     * @param {string|Array} names
+     * @param {string|Array} [elements]
+     * @param {function} loader
+     * @return void
+     */
+    $.Lazy = $.lazy = function(names, elements, loader) {
+        // make second parameter optional
+        if( $.isFunction(elements) ) {
+            loader = elements;
+            elements = [];
+        }
+
+        // exit here if parameter is not a callable function
+        if( !$.isFunction(loader) ) {
+            return;
+        }
+
+        // make parameters an array of names to be sure
+        names = $.isArray(names) ? names : [names];
+        elements = $.isArray(elements) ? elements : [elements];
+
+        var config = LazyPlugin.prototype.config,
+            forced = config._f || (config._f = {});
+
+        // add the loader plugin for every name
+        for( var i = 0, l = names.length; i < l; i++ ) {
+            if( config[names[i]] === undefined || $.isFunction(config[names[i]]) ) {
+                config[names[i]] = loader;
+            }
+        }
+
+        // add forced elements loader
+        for( var c = 0, a = elements.length; c < a; c++ ) {
+            forced[elements[c]] = names[0];
+        }
+    };
+
+    /**
+     * contains all logic and the whole element handling
+     * is packed in a private function outside class to reduce memory usage, because it will not be created on every plugin instance
+     * @access private
+     * @type {function}
+     * @param {LazyPlugin} instance
+     * @param {object} config
+     * @param {object|Array} items
+     * @param {object} events
+     * @param {string} namespace
+     * @return void
+     */
+    function _executeLazy(instance, config, items, events, namespace) {
+        /**
+         * a helper to trigger the 'onFinishedAll' callback after all other events
+         * @access private
+         * @type {number}
+         */
+        var _awaitingAfterLoad = 0,
+
+        /**
+         * visible content width
+         * @access private
+         * @type {number}
+         */
+        _actualWidth = -1,
+
+        /**
+         * visible content height
+         * @access private
+         * @type {number}
+         */
+        _actualHeight = -1,
+
+        /**
+         * determine possibly detected high pixel density
+         * @access private
+         * @type {boolean}
+         */
+        _isRetinaDisplay = false, 
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _afterLoad = "afterLoad",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _load = "load",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _error = "error",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _img = "img",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _src = "src",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _srcset = "srcset",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _sizes = "sizes",
+
+        /**
+         * dictionary entry for better minimization
+         * @access private
+         * @type {string}
+         */
+        _backgroundImage = "background-image";
+
+        /**
+         * initialize plugin
+         * bind loading to events or set delay time to load all items at once
+         * @access private
+         * @return void
+         */
+        function _initialize() {
+            // detect actual device pixel ratio
+            // noinspection JSUnresolvedVariable
+            _isRetinaDisplay = window.devicePixelRatio > 1;
+
+            // prepare all initial items
+            items = _prepareItems(items);
+
+            // if delay time is set load all items at once after delay time
+            if( config.delay >= 0 ) {
+                setTimeout(function() {
+                    _lazyLoadItems(true);
+                }, config.delay);
+            }
+
+            // if no delay is set or combine usage is active bind events
+            if( config.delay < 0 || config.combined ) {
+                // create unique event function
+                events.e = _throttle(config.throttle, function(event) {
+                    // reset detected window size on resize event
+                    if( event.type === "resize" ) {
+                        _actualWidth = _actualHeight = -1;
+                    }
+
+                    // execute 'lazy magic'
+                    _lazyLoadItems(event.all);
+                });
+
+                // create function to add new items to instance
+                events.a = function(additionalItems) {
+                    additionalItems = _prepareItems(additionalItems);
+                    items.push.apply(items, additionalItems);
+                };
+
+                // create function to get all instance items left
+                events.g = function() {
+                    // filter loaded items before return in case internal filter was not running until now
+                    return (items = $(items).filter(function() {
+                        return !$(this).data(config.loadedName);
+                    }));
+                };
+
+                // create function to force loading elements
+                events.f = function(forcedItems) {
+                    for( var i = 0; i < forcedItems.length; i++ ) {
+                        // only handle item if available in current instance
+                        // use a compare function, because Zepto can't handle object parameter for filter
+                        // var item = items.filter(forcedItems[i]);
+                        /* jshint loopfunc: true */
+                        var item = items.filter(function() {
+                            return this === forcedItems[i];
+                        });
+
+                        if( item.length ) {
+                            _lazyLoadItems(false, item);   
+                        }
+                    }
+                };
+
+                // load initial items
+                _lazyLoadItems();
+
+                // bind lazy load functions to scroll and resize event
+                // noinspection JSUnresolvedVariable
+                $(config.appendScroll).on("scroll." + namespace + " resize." + namespace, events.e);
+            }
+        }
+
+        /**
+         * prepare items before handle them
+         * @access private
+         * @param {Array|object|jQuery} items
+         * @return {Array|object|jQuery}
+         */
+        function _prepareItems(items) {
+            // fetch used configurations before loops
+            var defaultImage = config.defaultImage,
+                placeholder = config.placeholder,
+                imageBase = config.imageBase,
+                srcsetAttribute = config.srcsetAttribute,
+                loaderAttribute = config.loaderAttribute,
+                forcedTags = config._f || {};
+
+            // filter items and only add those who not handled yet and got needed attributes available
+            items = $(items).filter(function() {
+                var element = $(this),
+                    tag = _getElementTagName(this);
+
+                return !element.data(config.handledName) && 
+                       (element.attr(config.attribute) || element.attr(srcsetAttribute) || element.attr(loaderAttribute) || forcedTags[tag] !== undefined);
+            })
+
+            // append plugin instance to all elements
+            .data("plugin_" + config.name, instance);
+
+            for( var i = 0, l = items.length; i < l; i++ ) {
+                var element = $(items[i]),
+                    tag = _getElementTagName(items[i]),
+                    elementImageBase = element.attr(config.imageBaseAttribute) || imageBase;
+
+                // generate and update source set if an image base is set
+                if( tag === _img && elementImageBase && element.attr(srcsetAttribute) ) {
+                    element.attr(srcsetAttribute, _getCorrectedSrcSet(element.attr(srcsetAttribute), elementImageBase));
+                }
+
+                // add loader to forced element types
+                if( forcedTags[tag] !== undefined && !element.attr(loaderAttribute) ) {
+                    element.attr(loaderAttribute, forcedTags[tag]);
+                }
+
+                // set default image on every element without source
+                if( tag === _img && defaultImage && !element.attr(_src) ) {
+                    element.attr(_src, defaultImage);
+                }
+
+                // set placeholder on every element without background image
+                else if( tag !== _img && placeholder && (!element.css(_backgroundImage) || element.css(_backgroundImage) === "none") ) {
+                    element.css(_backgroundImage, "url('" + placeholder + "')");
+                }
+            }
+
+            return items;
+        }
+
+        /**
+         * the 'lazy magic' - check all items
+         * @access private
+         * @param {boolean} [allItems]
+         * @param {object} [forced]
+         * @return void
+         */
+        function _lazyLoadItems(allItems, forced) {
+            // skip if no items where left
+            if( !items.length ) {
+                // destroy instance if option is enabled
+                if( config.autoDestroy ) {
+                    // noinspection JSUnresolvedFunction
+                    instance.destroy();
+                }
+
+                return;
+            }
+
+            var elements = forced || items,
+                loadTriggered = false,
+                imageBase = config.imageBase || "",
+                srcsetAttribute = config.srcsetAttribute,
+                handledName = config.handledName;
+
+            // loop all available items
+            for( var i = 0; i < elements.length; i++ ) {
+                // item is at least in loadable area
+                if( allItems || forced || _isInLoadableArea(elements[i]) ) {
+                    var element = $(elements[i]),
+                        tag = _getElementTagName(elements[i]),
+                        attribute = element.attr(config.attribute),
+                        elementImageBase = element.attr(config.imageBaseAttribute) || imageBase,
+                        customLoader = element.attr(config.loaderAttribute);
+
+                        // is not already handled 
+                    if( !element.data(handledName) &&
+                        // and is visible or visibility doesn't matter
+                        (!config.visibleOnly || element.is(":visible")) && (
+                        // and image source or source set attribute is available
+                        (attribute || element.attr(srcsetAttribute)) && (
+                            // and is image tag where attribute is not equal source or source set
+                            (tag === _img && (elementImageBase + attribute !== element.attr(_src) || element.attr(srcsetAttribute) !== element.attr(_srcset))) ||
+                            // or is non image tag where attribute is not equal background
+                            (tag !== _img && elementImageBase + attribute !== element.css(_backgroundImage))
+                        ) ||
+                        // or custom loader is available
+                        customLoader ))
+                    {
+                        // mark element always as handled as this point to prevent double handling
+                        loadTriggered = true;
+                        element.data(handledName, true);
+
+                        // load item
+                        _handleItem(element, tag, elementImageBase, customLoader);
+                    }
+                }
+            }
+
+            // when something was loaded remove them from remaining items
+            if( loadTriggered ) {
+                items = $(items).filter(function() {
+                    return !$(this).data(handledName);
+                });
+            }
+        }
+
+        /**
+         * load the given element the lazy way
+         * @access private
+         * @param {object} element
+         * @param {string} tag
+         * @param {string} imageBase
+         * @param {function} [customLoader]
+         * @return void
+         */
+        function _handleItem(element, tag, imageBase, customLoader) {
+            // increment count of items waiting for after load
+            ++_awaitingAfterLoad;
+
+            // extended error callback for correct 'onFinishedAll' handling
+            var errorCallback = function() {
+                _triggerCallback("onError", element);
+                _reduceAwaiting();
+
+                // prevent further callback calls
+                errorCallback = $.noop;
+            };
+
+            // trigger function before loading image
+            _triggerCallback("beforeLoad", element);
+
+            // fetch all double used data here for better code minimization
+            var srcAttribute = config.attribute,
+                srcsetAttribute = config.srcsetAttribute,
+                sizesAttribute = config.sizesAttribute,
+                retinaAttribute = config.retinaAttribute,
+                removeAttribute = config.removeAttribute,
+                loadedName = config.loadedName,
+                elementRetina = element.attr(retinaAttribute);
+
+            // handle custom loader
+            if( customLoader ) {
+                // on load callback
+                var loadCallback = function() {
+                    // remove attribute from element
+                    if( removeAttribute ) {
+                        element.removeAttr(config.loaderAttribute);
+                    }
+
+                    // mark element as loaded
+                    element.data(loadedName, true);
+
+                    // call after load event
+                    _triggerCallback(_afterLoad, element);
+
+                    // remove item from waiting queue and possibly trigger finished event
+                    // it's needed to be asynchronous to run after filter was in _lazyLoadItems
+                    setTimeout(_reduceAwaiting, 1);
+
+                    // prevent further callback calls
+                    loadCallback = $.noop;
+                };
+
+                // bind error event to trigger callback and reduce waiting amount
+                element.off(_error).one(_error, errorCallback)
+
+                // bind after load callback to element
+                .one(_load, loadCallback);
+
+                // trigger custom loader and handle response
+                if( !_triggerCallback(customLoader, element, function(response) {
+                    if( response ) {
+                        element.off(_load);
+                        loadCallback();
+                    }
+                    else {
+                        element.off(_error);
+                        errorCallback();
+                    }
+                })) element.trigger(_error);
+            }
+
+            // handle images
+            else {
+                // create image object
+                var imageObj = $(new Image());
+
+                // bind error event to trigger callback and reduce waiting amount
+                imageObj.one(_error, errorCallback)
+
+                // bind after load callback to image
+                .one(_load, function() {
+                    // remove element from view
+                    element.hide();
+
+                    // set image back to element
+                    // do it as single 'attr' calls, to be sure 'src' is set after 'srcset'
+                    if( tag === _img ) {
+                        element.attr(_sizes, imageObj.attr(_sizes))
+                               .attr(_srcset, imageObj.attr(_srcset))
+                               .attr(_src, imageObj.attr(_src));
+                    }
+                    else {
+                        element.css(_backgroundImage, "url('" + imageObj.attr(_src) + "')");
+                    }
+
+                    // bring it back with some effect!
+                    element[config.effect](config.effectTime);
+
+                    // remove attribute from element
+                    if( removeAttribute ) {
+                        element.removeAttr(srcAttribute + " " + srcsetAttribute + " " + retinaAttribute + " " + config.imageBaseAttribute);
+
+                        // only remove 'sizes' attribute, if it was a custom one
+                        if( sizesAttribute !== _sizes ) {
+                            element.removeAttr(sizesAttribute);
+                        }
+                    }
+
+                    // mark element as loaded
+                    element.data(loadedName, true);
+
+                    // call after load event
+                    _triggerCallback(_afterLoad, element);
+
+                    // cleanup image object
+                    imageObj.remove();
+
+                    // remove item from waiting queue and possibly trigger finished event
+                    _reduceAwaiting();
+                });
+
+                // set sources
+                // do it as single 'attr' calls, to be sure 'src' is set after 'srcset'
+                var imageSrc = (_isRetinaDisplay && elementRetina ? elementRetina : element.attr(srcAttribute)) || "";
+                imageObj.attr(_sizes, element.attr(sizesAttribute))
+                        .attr(_srcset, element.attr(srcsetAttribute))
+                        .attr(_src, imageSrc ? imageBase + imageSrc : null);
+
+                // call after load even on cached image
+                imageObj.complete && imageObj.trigger(_load); // jshint ignore : line
+            }
+        }
+
+        /**
+         * check if the given element is inside the current viewport or threshold
+         * @access private
+         * @param {object} element
+         * @return {boolean}
+         */
+        function _isInLoadableArea(element) {
+            var elementBound = element.getBoundingClientRect(),
+                direction    = config.scrollDirection,
+                threshold    = config.threshold,
+                vertical     = // check if element is in loadable area from top
+                               ((_getActualHeight() + threshold) > elementBound.top) &&
+                               // check if element is even in loadable are from bottom
+                               (-threshold < elementBound.bottom),
+                horizontal   = // check if element is in loadable area from left
+                               ((_getActualWidth() + threshold) > elementBound.left) &&
+                               // check if element is even in loadable area from right
+                               (-threshold < elementBound.right);
+
+            if( direction === "vertical" ) {
+                return vertical;
+            }
+            else if( direction === "horizontal" ) {
+                return horizontal;
+            }
+
+            return vertical && horizontal;
+        }
+
+        /**
+         * receive the current viewed width of the browser
+         * @access private
+         * @return {number}
+         */
+        function _getActualWidth() {
+            return _actualWidth >= 0 ? _actualWidth : (_actualWidth = $(window).width());
+        }
+
+        /**
+         * receive the current viewed height of the browser
+         * @access private
+         * @return {number}
+         */
+        function _getActualHeight() {
+            return _actualHeight >= 0 ? _actualHeight : (_actualHeight = $(window).height());
+        }
+
+        /**
+         * get lowercase tag name of an element
+         * @access private
+         * @param {object} element
+         * @returns {string}
+         */
+        function _getElementTagName(element) {
+            return element.tagName.toLowerCase();
+        }
+
+        /**
+         * prepend image base to all srcset entries
+         * @access private
+         * @param {string} srcset
+         * @param {string} imageBase
+         * @returns {string}
+         */
+        function _getCorrectedSrcSet(srcset, imageBase) {
+            if( imageBase ) {
+                // trim, remove unnecessary spaces and split entries
+                var entries = srcset.split(",");
+                srcset = "";
+
+                for( var i = 0, l = entries.length; i < l; i++ ) {
+                    srcset += imageBase + entries[i].trim() + (i !== l - 1 ? "," : "");
+                }
+            }
+
+            return srcset;
+        }
+
+        /**
+         * helper function to throttle down event triggering
+         * @access private
+         * @param {number} delay
+         * @param {function} callback
+         * @return {function}
+         */
+        function _throttle(delay, callback) {
+            var timeout,
+                lastExecute = 0;
+
+            return function(event, ignoreThrottle) {
+                var elapsed = +new Date() - lastExecute;
+
+                function run() {
+                    lastExecute = +new Date();
+                    // noinspection JSUnresolvedFunction
+                    callback.call(instance, event);
+                }
+
+                timeout && clearTimeout(timeout); // jshint ignore : line
+
+                if( elapsed > delay || !config.enableThrottle || ignoreThrottle ) {
+                    run();
+                }
+                else {
+                    timeout = setTimeout(run, delay - elapsed);
+                }
+            };
+        }
+
+        /**
+         * reduce count of awaiting elements to 'afterLoad' event and fire 'onFinishedAll' if reached zero
+         * @access private
+         * @return void
+         */
+        function _reduceAwaiting() {
+            --_awaitingAfterLoad;
+
+            // if no items were left trigger finished event
+            if( !items.length && !_awaitingAfterLoad ) {
+                _triggerCallback("onFinishedAll");
+            }
+        }
+
+        /**
+         * single implementation to handle callbacks, pass element and set 'this' to current instance
+         * @access private
+         * @param {string|function} callback
+         * @param {object} [element]
+         * @param {*} [args]
+         * @return {boolean}
+         */
+        function _triggerCallback(callback, element, args) {
+            if( (callback = config[callback]) ) {
+                // jQuery's internal '$(arguments).slice(1)' are causing problems at least on old iPads
+                // below is shorthand of 'Array.prototype.slice.call(arguments, 1)'
+                callback.apply(instance, [].slice.call(arguments, 1));
+                return true;
+            }
+
+            return false;
+        }
+
+        // if event driven or window is already loaded don't wait for page loading
+        if( config.bind === "event" || windowLoaded ) {
+            _initialize();
+        }
+
+        // otherwise load initial items and start lazy after page load
+        else {
+            // noinspection JSUnresolvedVariable
+            $(window).on(_load + "." + namespace, _initialize);
+        }  
+    }
+
+    /**
+     * lazy plugin class constructor
+     * @constructor
+     * @access private
+     * @param {object} elements
+     * @param {object} settings
+     * @return {object|LazyPlugin}
+     */
+    function LazyPlugin(elements, settings) {
+        /**
+         * this lazy plugin instance
+         * @access private
+         * @type {object|LazyPlugin|LazyPlugin.prototype}
+         */
+        var _instance = this,
+
+        /**
+         * this lazy plugin instance configuration
+         * @access private
+         * @type {object}
+         */
+        _config = $.extend({}, _instance.config, settings),
+
+        /**
+         * instance generated event executed on container scroll or resize
+         * packed in an object to be referenceable and short named because properties will not be minified
+         * @access private
+         * @type {object}
+         */
+        _events = {},
+
+        /**
+         * unique namespace for instance related events
+         * @access private
+         * @type {string}
+         */
+        _namespace = _config.name + "-" + (++lazyInstanceId);
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * wrapper to get or set an entry from plugin instance configuration
+         * much smaller on minify as direct access
+         * @access public
+         * @type {function}
+         * @param {string} entryName
+         * @param {*} [value]
+         * @return {LazyPlugin|*}
+         */
+        _instance.config = function(entryName, value) {
+            if( value === undefined ) {
+                return _config[entryName];
+            }
+
+            _config[entryName] = value;
+            return _instance;
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * add additional items to current instance
+         * @access public
+         * @param {Array|object|string} items
+         * @return {LazyPlugin}
+         */
+        _instance.addItems = function(items) {
+            _events.a && _events.a($.type(items) === "string" ? $(items) : items); // jshint ignore : line
+            return _instance;
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * get all left items of this instance
+         * @access public
+         * @returns {object}
+         */
+        _instance.getItems = function() {
+            return _events.g ? _events.g() : {};
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * force lazy to load all items in loadable area right now
+         * by default without throttle
+         * @access public
+         * @type {function}
+         * @param {boolean} [useThrottle]
+         * @return {LazyPlugin}
+         */
+        _instance.update = function(useThrottle) {
+            _events.e && _events.e({}, !useThrottle); // jshint ignore : line
+            return _instance;
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * force element(s) to load directly, ignoring the viewport
+         * @access public
+         * @param {Array|object|string} items
+         * @return {LazyPlugin}
+         */
+        _instance.force = function(items) {
+            _events.f && _events.f($.type(items) === "string" ? $(items) : items); // jshint ignore : line
+            return _instance;
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * force lazy to load all available items right now
+         * this call ignores throttling
+         * @access public
+         * @type {function}
+         * @return {LazyPlugin}
+         */
+        _instance.loadAll = function() {
+            _events.e && _events.e({all: true}, true); // jshint ignore : line
+            return _instance;
+        };
+
+        // noinspection JSUndefinedPropertyAssignment
+        /**
+         * destroy this plugin instance
+         * @access public
+         * @type {function}
+         * @return undefined
+         */
+        _instance.destroy = function() {
+            // unbind instance generated events
+            // noinspection JSUnresolvedFunction, JSUnresolvedVariable
+            $(_config.appendScroll).off("." + _namespace, _events.e);
+            // noinspection JSUnresolvedVariable
+            $(window).off("." + _namespace);
+
+            // clear events
+            _events = {};
+
+            return undefined;
+        };
+
+        // start using lazy and return all elements to be chainable or instance for further use
+        // noinspection JSUnresolvedVariable
+        _executeLazy(_instance, _config, elements, _events, _namespace);
+        return _config.chainable ? elements : _instance;
+    }
+
+    /**
+     * settings and configuration data
+     * @access public
+     * @type {object}
+     */
+    LazyPlugin.prototype.config = {
+        // general
+        name               : "lazy",
+        chainable          : true,
+        autoDestroy        : true,
+        bind               : "load",
+        threshold          : 500,
+        visibleOnly        : false,
+        appendScroll       : window,
+        scrollDirection    : "both",
+        imageBase          : null,
+        defaultImage       : "data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==",
+        placeholder        : null,
+        delay              : -1,
+        combined           : false,
+
+        // attributes
+        attribute          : "data-src",
+        srcsetAttribute    : "data-srcset",
+        sizesAttribute     : "data-sizes",
+        retinaAttribute    : "data-retina",
+        loaderAttribute    : "data-loader",
+        imageBaseAttribute : "data-imagebase",
+        removeAttribute    : true,
+        handledName        : "handled",
+        loadedName         : "loaded",
+
+        // effect
+        effect             : "show",
+        effectTime         : 0,
+
+        // throttle
+        enableThrottle     : true,
+        throttle           : 250,
+
+        // callbacks
+        beforeLoad         : undefined,
+        afterLoad          : undefined,
+        onError            : undefined,
+        onFinishedAll      : undefined
+    };
+
+    // register window load event globally to prevent not loading elements
+    // since jQuery 3.X ready state is fully async and may be executed after 'load' 
+    $(window).on("load", function() {
+        windowLoaded = true;
+    });
+})(window);

librerias/lazy/jquery.lazy.min.js

@@ -0,0 +1,2 @@
+/*! jQuery & Zepto Lazy v1.7.6 - http://jquery.eisbehr.de/lazy - MIT&GPL-2.0 license - Copyright 2012-2017 Daniel 'Eisbehr' Kern */
+!function(t,e){"use strict";function r(r,a,i,u,l){function f(){L=t.devicePixelRatio>1,i=c(i),a.delay>=0&&setTimeout(function(){s(!0)},a.delay),(a.delay<0||a.combined)&&(u.e=v(a.throttle,function(t){"resize"===t.type&&(w=B=-1),s(t.all)}),u.a=function(t){t=c(t),i.push.apply(i,t)},u.g=function(){return i=n(i).filter(function(){return!n(this).data(a.loadedName)})},u.f=function(t){for(var e=0;e<t.length;e++){var r=i.filter(function(){return this===t[e]});r.length&&s(!1,r)}},s(),n(a.appendScroll).on("scroll."+l+" resize."+l,u.e))}function c(t){var i=a.defaultImage,o=a.placeholder,u=a.imageBase,l=a.srcsetAttribute,f=a.loaderAttribute,c=a._f||{};t=n(t).filter(function(){var t=n(this),r=m(this);return!t.data(a.handledName)&&(t.attr(a.attribute)||t.attr(l)||t.attr(f)||c[r]!==e)}).data("plugin_"+a.name,r);for(var s=0,d=t.length;s<d;s++){var A=n(t[s]),g=m(t[s]),h=A.attr(a.imageBaseAttribute)||u;g===N&&h&&A.attr(l)&&A.attr(l,b(A.attr(l),h)),c[g]===e||A.attr(f)||A.attr(f,c[g]),g===N&&i&&!A.attr(E)?A.attr(E,i):g===N||!o||A.css(O)&&"none"!==A.css(O)||A.css(O,"url('"+o+"')")}return t}function s(t,e){if(!i.length)return void(a.autoDestroy&&r.destroy());for(var o=e||i,u=!1,l=a.imageBase||"",f=a.srcsetAttribute,c=a.handledName,s=0;s<o.length;s++)if(t||e||A(o[s])){var g=n(o[s]),h=m(o[s]),b=g.attr(a.attribute),v=g.attr(a.imageBaseAttribute)||l,p=g.attr(a.loaderAttribute);g.data(c)||a.visibleOnly&&!g.is(":visible")||!((b||g.attr(f))&&(h===N&&(v+b!==g.attr(E)||g.attr(f)!==g.attr(F))||h!==N&&v+b!==g.css(O))||p)||(u=!0,g.data(c,!0),d(g,h,v,p))}u&&(i=n(i).filter(function(){return!n(this).data(c)}))}function d(t,e,r,i){++z;var o=function(){y("onError",t),p(),o=n.noop};y("beforeLoad",t);var u=a.attribute,l=a.srcsetAttribute,f=a.sizesAttribute,c=a.retinaAttribute,s=a.removeAttribute,d=a.loadedName,A=t.attr(c);if(i){var g=function(){s&&t.removeAttr(a.loaderAttribute),t.data(d,!0),y(T,t),setTimeout(p,1),g=n.noop};t.off(I).one(I,o).one(D,g),y(i,t,function(e){e?(t.off(D),g()):(t.off(I),o())})||t.trigger(I)}else{var h=n(new Image);h.one(I,o).one(D,function(){t.hide(),e===N?t.attr(C,h.attr(C)).attr(F,h.attr(F)).attr(E,h.attr(E)):t.css(O,"url('"+h.attr(E)+"')"),t[a.effect](a.effectTime),s&&(t.removeAttr(u+" "+l+" "+c+" "+a.imageBaseAttribute),f!==C&&t.removeAttr(f)),t.data(d,!0),y(T,t),h.remove(),p()});var m=(L&&A?A:t.attr(u))||"";h.attr(C,t.attr(f)).attr(F,t.attr(l)).attr(E,m?r+m:null),h.complete&&h.trigger(D)}}function A(t){var e=t.getBoundingClientRect(),r=a.scrollDirection,n=a.threshold,i=h()+n>e.top&&-n<e.bottom,o=g()+n>e.left&&-n<e.right;return"vertical"===r?i:"horizontal"===r?o:i&&o}function g(){return w>=0?w:w=n(t).width()}function h(){return B>=0?B:B=n(t).height()}function m(t){return t.tagName.toLowerCase()}function b(t,e){if(e){var r=t.split(",");t="";for(var a=0,n=r.length;a<n;a++)t+=e+r[a].trim()+(a!==n-1?",":"")}return t}function v(t,e){var n,i=0;return function(o,u){function l(){i=+new Date,e.call(r,o)}var f=+new Date-i;n&&clearTimeout(n),f>t||!a.enableThrottle||u?l():n=setTimeout(l,t-f)}}function p(){--z,i.length||z||y("onFinishedAll")}function y(t,e,n){return!!(t=a[t])&&(t.apply(r,[].slice.call(arguments,1)),!0)}var z=0,w=-1,B=-1,L=!1,T="afterLoad",D="load",I="error",N="img",E="src",F="srcset",C="sizes",O="background-image";"event"===a.bind||o?f():n(t).on(D+"."+l,f)}function a(a,o){var u=this,l=n.extend({},u.config,o),f={},c=l.name+"-"+ ++i;return u.config=function(t,r){return r===e?l[t]:(l[t]=r,u)},u.addItems=function(t){return f.a&&f.a("string"===n.type(t)?n(t):t),u},u.getItems=function(){return f.g?f.g():{}},u.update=function(t){return f.e&&f.e({},!t),u},u.force=function(t){return f.f&&f.f("string"===n.type(t)?n(t):t),u},u.loadAll=function(){return f.e&&f.e({all:!0},!0),u},u.destroy=function(){return n(l.appendScroll).off("."+c,f.e),n(t).off("."+c),f={},e},r(u,l,a,f,c),l.chainable?a:u}var n=t.jQuery||t.Zepto,i=0,o=!1;n.fn.Lazy=n.fn.lazy=function(t){return new a(this,t)},n.Lazy=n.lazy=function(t,r,i){if(n.isFunction(r)&&(i=r,r=[]),n.isFunction(i)){t=n.isArray(t)?t:[t],r=n.isArray(r)?r:[r];for(var o=a.prototype.config,u=o._f||(o._f={}),l=0,f=t.length;l<f;l++)(o[t[l]]===e||n.isFunction(o[t[l]]))&&(o[t[l]]=i);for(var c=0,s=r.length;c<s;c++)u[r[c]]=t[0]}},a.prototype.config={name:"lazy",chainable:!0,autoDestroy:!0,bind:"load",threshold:500,visibleOnly:!1,appendScroll:t,scrollDirection:"both",imageBase:null,defaultImage:"data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACH5BAEAAAAALAAAAAABAAEAAAICRAEAOw==",placeholder:null,delay:-1,combined:!1,attribute:"data-src",srcsetAttribute:"data-srcset",sizesAttribute:"data-sizes",retinaAttribute:"data-retina",loaderAttribute:"data-loader",imageBaseAttribute:"data-imagebase",removeAttribute:!0,handledName:"handled",loadedName:"loaded",effect:"show",effectTime:0,enableThrottle:!0,throttle:250,beforeLoad:e,afterLoad:e,onError:e,onFinishedAll:e},n(t).on("load",function(){o=!0})}(window);

librerias/lazy/jquery.unveil.js

@@ -0,0 +1,56 @@
+/**
+ * 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($) {
+
+  $.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;
+
+    this.one("unveil", function() {
+      var source = this.getAttribute(attrib);
+      source = source || this.getAttribute("data-src");
+      if (source) {
+        this.setAttribute("src", source);
+        if (typeof callback === "function") callback.call(this);
+      }
+    });
+
+    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);

milfs/funciones/funciones.php

@@ -8739,7 +8739,7 @@ $imagen = remplacetas('form_datos','control',$row['control'],'contenido',"id_cam
 		
 		$titulo = remplacetas('form_datos','control',$row['control'],'contenido',"id_campo = '$campo_nombre'") ;
 	$contenido_desplegado ="
-<div style=' min-height: 500px; height: 500px;
+<div class='lazy' style=' min-height: 500px; height: 500px;
   background-image: url($_SESSION[url]images/secure/?file=600/$imagen[0]);
   background-position: center center;
   background-size: contain;
@@ -8765,7 +8765,7 @@ $imagen = remplacetas('form_datos','control',$row['control'],'contenido',"id_cam
 
 
 
-	$indicadores .= "<div><img height='50px'  width='100px'   src='$_SESSION[url]images/secure/?file=150/$imagen[0]'></div>";
+	$indicadores .= "<div><img height='50px'  width='100px'   data-src='$_SESSION[url]images/secure/?file=150/$imagen[0]'  src='$_SESSION[url]images/secure/?file=150/$imagen[0]'></div>";
 	$titulo = remplacetas('form_datos','id',$identificador,'contenido',"") ;
 	//$contenido  .= "$contenido_desplegado ";
 	$ordenado = ($ordenado +1 );
@@ -11057,7 +11057,7 @@ if (mysqli_num_rows($sql)!='0'){
 		if($imagen[3] != null AND $tipo !='titulos') {
 			$array[image]=$imagen;
 			$imagen_icon="secure/?file=150/$imagen";
-		$imagen= "<img class='thumbnail' src='images/secure/?file=150/$imagen' alt='$imagen' style='max-width:100px;' title='$imagen'>";
+		$imagen= "<img class='thumbnail'  data-src='images/secure/?file=150/$imagen' src='images/secure/?file=150/$imagen' alt='$imagen' style='max-width:100px;' title='$imagen'>";
 $td .= "<td class='planilla_$row[id_campo]' >$imagen</td>";
 	}else {$imagen='';}
 
@@ -11103,7 +11103,7 @@ $td .= "<td class='planilla_$row[id_campo]' >$imagen</td>";
 				}else {
 					$size="150"	;			
 				}
-				if($contenido !=""){$contenido = "<img class='img img-responsive' style='max-height: $size"."px !important;' src='$_SESSION[site]milfs/images/secure/?file=$size/$contenido'>"; }
+				if($contenido !=""){$contenido = "<img class=' lazy img img-responsive'  data-src='$_SESSION[site]milfs/images/secure/?file=$size/$contenido' style='max-height: $size"."px !important;' src=''>"; }
 				else{$contenido="";}
 				}
 			elseif($campo_tipo=='14'){