The Lazy plugin for jQuery load specified images after the page load itself and speed up your loading time through this. Images outside of the visible area will only get loaded when the user scrolls to them. This will not only increase the page loading speed, it will even decrease your traffic.

Lazy will work with a wide range of browsers and support jQuery versions for years backwards. You can pick any version since jQuery 1.3.0 or greater.

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Source: jquery.eisbehr.de

1. INCLUDE JS FILES

<script type="text/javascript" src="../jquery.min.js"></script>
<script type="text/javascript" src="../jquery.lazy.min.js"></script>

2. HTML

you need to add a 'data-src' attribute to those images you want to load delayed and insert the image path you want to load over Lazy

<img class="lazy" data-src="path_to/image.jpg" src="" />

3. JAVASCRIPT

// javascript code
jQuery(document).ready(function() {
    jQuery("img.lazy").lazy();
});

4. OPTIONS

Overview of all settings you can use to configure Lazy and change its behavior:

Delayed Loading

By default, Lazy will load images on scroll or resize event, when an images enters the threshold/viewport. But there is also an option to load all images after a given delay time. You can set the time in milliseconds with the 'delay' parameter.

// javascript code
jQuery(document).ready(function() {
    jQuery("img.lazy").lazy({
        delay: 2000
    });
});

Callbacks

Lazy gives you the option to use callback functions, before, on and after loading images. And if the imange to load was not found, there is even a error callback. You can use them to create a better and more dynamic user experience or for further events.

The before and after load callback will have the current element as parameter. Because Lazy can even handle non-img tags, the on and error callbacks will always have an image object as parameter.

// javascript code
jQuery("img.lazy").lazy({
    beforeLoad: function(element) {
        element.removeClass("lazy"); 
    },
    onLoad: function(element) {
        element.addClass("loading"); 
    },
    afterLoad: function(element) { 
        element.removeClass("loading").addClass("loaded"); 
    },
    onError: function(element) {
        console.log("image loading error: " + element.attr("src"));
    },
});

Throttle

The throttle function helps to decrease unnecessary function calls through scroll or resize events. On this events the trigger gets called many, many times in a second. But there is no need to handle all of this event triggers at once. To many calls can slow down the javascript engine and brings no advantages for the user.

So the throttle will limit those calls in a given time. In this timespawn only one call will be handled and all others will be ignored.

By default this option is activated and will work in background. You will not notice it. There are some parameters to change the timespawn, for faster or slower handling, or deactivate the throttle:

// javascript code
jQuery("img.lazy").lazy({
    enableThrottle: true,
    throttle: 250
});