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How To Add JQuery Lazy Load Plugin to Blogger

Posted by Lasantha Bandara on February 18th, 2013 File Under : image, java script, jquery11 Comments
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This post will explain to you how to add JQuery Lazy Load Plugin to your blogger blog or any other website easily.If you have a blog or website containing many images, this tricks will be very helpful to you.It can reduce the page loading time of your site.You can see more details about this JQuery Lazy Load Plugin from here: http://www.appelsiini.net/projects/lazyload.Look at the DEMO page to see the result.

Lazy loader is a jQuery plugin written in JavaScript. It delays loading of images in (long) web pages. Images outside of viewport (visible part of web page) wont be loaded before user scrolls to them. Using lazy load on long web pages containing many large images makes the page load faster. Browser will be in ready state after loading visible images. In some cases it can also help to reduce server load.

To add JQuery Lazy Load Plugin to your blogger blog or any other website follow the steps given below:

1.Login to your blogger dashboard--> layout- -> Edit HTML

2.Scroll down to where you see </head> tag .

3.Copy below code and paste it just before the </head> tag .

<script charset='utf-8' src='http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js' type='text/javascript'/>

<script type='text/javascript'>
//<![CDATA[

/*
 * Lazy Load - jQuery plugin for lazy loading images
 *
 * Copyright (c) 2007-2009 Mika Tuupola
 *
 * Licensed under the MIT license:
 *   http://www.opensource.org/licenses/mit-license.php
 *
 * Project home:
 *   http://www.appelsiini.net/projects/lazyload
 *
 * Version:  1.5.0
 *
 */
(function($) {

    $.fn.lazyload = function(options) {
        var settings = {
            threshold    : 0,
            failurelimit : 0,
            event        : "scroll",
            effect       : "show",
            container    : window
        };
                
        if(options) {
            $.extend(settings, options);
        }

        /* Fire one scroll event per scroll. Not one scroll event per image. */
        var elements = this;
        if ("scroll" == settings.event) {
            $(settings.container).bind("scroll", function(event) {
                
                var counter = 0;
                elements.each(function() {
                    if ($.abovethetop(this, settings) ||
                        $.leftofbegin(this, settings)) {
                            /* Nothing. */
                    } else if (!$.belowthefold(this, settings) &&
                        !$.rightoffold(this, settings)) {
                            $(this).trigger("appear");
                    } else {
                        if (counter++ > settings.failurelimit) {
                            return false;
                        }
                    }
                });
                /* Remove image from array so it is not looped next time. */
                var temp = $.grep(elements, function(element) {
                    return !element.loaded;
                });
                elements = $(temp);
            });
        }
        
        this.each(function() {
            var self = this;
            
            /* Save original only if it is not defined in HTML. */
            if (undefined == $(self).attr("original")) {
                $(self).attr("original", $(self).attr("src"));     
            }

            if ("scroll" != settings.event || 
                    undefined == $(self).attr("src") || 
                    settings.placeholder == $(self).attr("src") || 
                    ($.abovethetop(self, settings) ||
                     $.leftofbegin(self, settings) || 
                     $.belowthefold(self, settings) || 
                     $.rightoffold(self, settings) )) {
                        
                if (settings.placeholder) {
                    $(self).attr("src", settings.placeholder);      
                } else {
                    $(self).removeAttr("src");
                }
                self.loaded = false;
            } else {
                self.loaded = true;
            }
            
            /* When appear is triggered load original image. */
            $(self).one("appear", function() {
                if (!this.loaded) {
                    $("<img />")
                        .bind("load", function() {
                            $(self)
                                .hide()
                                .attr("src", $(self).attr("original"))
                                [settings.effect](settings.effectspeed);
                            self.loaded = true;
                        })
                        .attr("src", $(self).attr("original"));
                };
            });

            /* When wanted event is triggered load original image */
            /* by triggering appear.                              */
            if ("scroll" != settings.event) {
                $(self).bind(settings.event, function(event) {
                    if (!self.loaded) {
                        $(self).trigger("appear");
                    }
                });
            }
        });
        
        /* Force initial check if images should appear. */
        $(settings.container).trigger(settings.event);
        
        return this;

    };

    /* Convenience methods in jQuery namespace.           */
    /* Use as  $.belowthefold(element, {threshold : 100, container : window}) */

    $.belowthefold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).height() + $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top + $(settings.container).height();
        }
        return fold <= $(element).offset().top - settings.threshold;
    };
    
    $.rightoffold = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).width() + $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left + $(settings.container).width();
        }
        return fold <= $(element).offset().left - settings.threshold;
    };
        
    $.abovethetop = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollTop();
        } else {
            var fold = $(settings.container).offset().top;
        }
        return fold >= $(element).offset().top + settings.threshold  + $(element).height();
    };
    
    $.leftofbegin = function(element, settings) {
        if (settings.container === undefined || settings.container === window) {
            var fold = $(window).scrollLeft();
        } else {
            var fold = $(settings.container).offset().left;
        }
        return fold >= $(element).offset().left + settings.threshold + $(element).width();
    };
    /* Custom selectors for your convenience.   */
    /* Use as $("img:below-the-fold").something() */

    $.extend($.expr[':'], {
        "below-the-fold" : "$.belowthefold(a, {threshold : 0, container: window})",
        "above-the-fold" : "!$.belowthefold(a, {threshold : 0, container: window})",
        "right-of-fold"  : "$.rightoffold(a, {threshold : 0, container: window})",
        "left-of-fold"   : "!$.rightoffold(a, {threshold : 0, container: window})"
    });
    
})(jQuery);

//]]>
</script>

<script charset='utf-8' type='text/javascript'>

$(function() {

   $(&quot;img&quot;).lazyload({placeholder : &quot;http://4.bp.blogspot.com/-wRaPvE0Jqrs/USIW4erewNI/AAAAAAAAFNk/TXDOtgYUGlc/s1600/grey.gif&quot;,threshold : 200});

});

</script>

Note : You can download javascript files from here if you want to host above files yourself.

4.Now save your template and you are done.Refresh your site to see the result.

File Under : image, java script, jquery

11 Responses to “How To Add JQuery Lazy Load Plugin to Blogger”

  1. Trick Css says:

    good friend, but use for what? Thanks ^_^

  2. Beben says:

    whats different we add in CSS on img post???
    like...
    .post img background{url(http://Pic-Loading.gif) no-repeat center center
    i think thats same function another metode...great my dearest friend

  3. Anonymous says:

    @Trick Css

    Very useful.

  4. Asad Manzoor says:

    Thanks Bro keep it up

  5. Anthony Souls says:

    Hello there, Thanks, saw the Lazyloader but didnt know how to integrate it into blogger. I do have a question, I hope you can help: How do you get this to work with flash? I tried embed instead of img but it greyed it out and never reloaded it. I tried to edit the code img / to embed / in lazyloader to see if that worked, it didn't. Is it possible to get this to work with flash?

  6. Andi Techno says:

    ough i see why some my jquery not work when i put this lazy script, your file is error 404 (not found) please reupload

  7. girl games says:

    Very useful.

  8. surinder says:

    Thanks for sharing :)
    feel free to visit my page

  9. Comeso Anti-Piracy says:

    Thanks for this! Saved me a lot of time!

  10. celina says:

    wow..its works!! thank you so much for sharing this.. regards.

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