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26 Apr 2013
Infinite Scrolling in Blogger

infinity Symbol

Infinite Scrolling refers to the ability to continuously load new content on a page without refreshing it which gives an appearance of endlessness. It is used by major sites like Google+ , Facebook and Twitter and pretty successfully at that. The biggest benefit being exposure to more content and faster browsing . We will see how to integrate it into our Blogger blog by using Infinite Ajax Scroll jQuery plugin

Features

1. Faster Loading
2. Content Exposure increase many fold
3. More intuitive for Touch devices
4. Best suited for image-heavy blogs
5. Simplified Navigation
6. Higher user Engagement

Adding it to your Blog

Across the Whole Blog
It will work on the Home Page , Label Pages , Archive Pages as well as Post Pages ( the previous post will be loaded in full )

<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js'></script> <script type='text/javascript'> //<![CDATA[ (function($){'use strict';Date.now=Date.now||function(){return+new Date()};$.ias=function(g){var h=$.extend({},$.ias.defaults,g);var i=new $.ias.util();var j=new $.ias.paging(h.scrollContainer);var k=(h.history?new $.ias.history():false);var l=this;function init(){var d;j.onChangePage(function(a,b,c){if(k){k.setPage(a,c)}h.onPageChange.call(this,a,c,b)});reset();if(k&&k.havePage()){stop_scroll();d=k.getPage();i.forceScrollTop(function(){var a;if(d>1){paginateToPage(d);a=get_scroll_threshold(true);$('html, body').scrollTop(a)}else{reset()}})}return l}init();function reset(){hide_pagination();h.scrollContainer.scroll(scroll_handler)}function scroll_handler(){var a,scrThreshold;a=i.getCurrentScrollOffset(h.scrollContainer);scrThreshold=get_scroll_threshold();if(a>=scrThreshold){if(get_current_page()>=h.triggerPageThreshold){stop_scroll();show_trigger(function(){paginate(a)})}else{paginate(a)}}}function stop_scroll(){h.scrollContainer.unbind('scroll',scroll_handler)}function hide_pagination(){$(h.pagination).hide()}function get_scroll_threshold(a){var b,threshold;b=$(h.container).find(h.item).last();if(b.size()===0){return 0}threshold=b.offset().top+b.height();if(!a){threshold+=h.thresholdMargin}return threshold}function paginate(d,e){var f;f=$(h.next).attr('href');if(!f){if(h.noneleft){$(h.container).find(h.item).last().after(h.noneleft)}return stop_scroll()}if(h.beforePageChange&&$.isFunction(h.beforePageChange)){if(h.beforePageChange(d,f)===false){return}}j.pushPages(d,f);stop_scroll();show_loader();loadItems(f,function(a,b){var c=h.onLoadItems.call(this,b),curLastItem;if(c!==false){$(b).hide();curLastItem=$(h.container).find(h.item).last();curLastItem.after(b);$(b).fadeIn()}f=$(h.next,a).attr('href');$(h.pagination).replaceWith($(h.pagination,a));remove_loader();hide_pagination();if(f){reset()}else{stop_scroll()}h.onRenderComplete.call(this,b);if(e){e.call(this)}})}function loadItems(b,c,d){var e=[],container,startTime=Date.now(),diffTime,self;d=d||h.loaderDelay;$.get(b,null,function(a){container=$(h.container,a).eq(0);if(0===container.length){container=$(a).filter(h.container).eq(0)}if(container){container.find(h.item).each(function(){e.push(this)})}if(c){self=this;diffTime=Date.now()-startTime;if(diffTime<d){setTimeout(function(){c.call(self,a,e)},d-diffTime)}else{c.call(self,a,e)}}},'html')}function paginateToPage(a){var b=get_scroll_threshold(true);if(b>0){paginate(b,function(){stop_scroll();if((j.getCurPageNum(b)+1)<a){paginateToPage(a);$('html,body').animate({'scrollTop':b},400,'swing')}else{$('html,body').animate({'scrollTop':b},1000,'swing');reset()}})}}function get_current_page(){var a=i.getCurrentScrollOffset(h.scrollContainer);return j.getCurPageNum(a)}function get_loader(){var a=$('.ias_loader');if(a.size()===0){a=$('<div class="ias_loader">'+h.loader+'</div>');a.hide()}return a}function show_loader(){var a=get_loader(),el;if(h.customLoaderProc!==false){h.customLoaderProc(a)}else{el=$(h.container).find(h.item).last();el.after(a);a.fadeIn()}}function remove_loader(){var a=get_loader();a.remove()}function get_trigger(a){var b=$('.ias_trigger');if(b.size()===0){b=$('<div class="ias_trigger"><a href="#">'+h.trigger+'</a></div>');b.hide()}$('a',b).off('click').on('click',function(){remove_trigger();a.call();return false});return b}function show_trigger(a){var b=get_trigger(a),el;el=$(h.container).find(h.item).last();el.after(b);b.fadeIn()}function remove_trigger(){var a=get_trigger();a.remove()}};$.ias.defaults={container:'.blog-posts',scrollContainer:$(window),item:'.post-outer',pagination:'#blog-pager',next:'#blog-pager-older-link a',loader:'<img src="http://1.bp.blogspot.com/-luorIIJzBBo/USnR6gOh-1I/AAAAAAAAJ_c/VEh_iQfKHqE/s1600/loading.gif"/>',loaderDelay:600,triggerPageThreshold:8,trigger:'Load more Posts',thresholdMargin:-500,history:true,onPageChange:function(){},beforePageChange:function(){},onLoadItems:function(){},onRenderComplete:function(){ FB.XFBML.parse(); gapi.plusone.go(); twttr.widgets.load(); _gaq.push(['_trackPageview']); },customLoaderProc:false};$.ias.util=function(){var c=false;var d=false;var e=this;function init(){$(window).load(function(){c=true})}init();this.forceScrollTop=function(a){$('html,body').scrollTop(0);if(!d){if(!c){setTimeout(function(){e.forceScrollTop(a)},1)}else{a.call();d=true}}};this.getCurrentScrollOffset=function(a){var b,wndHeight;if(a.get(0)===window){b=a.scrollTop()}else{b=a.offset().top}wndHeight=a.height();return b+wndHeight}};$.ias.paging=function(){var c=[[0,document.location.toString()]];var d=function(){};var e=1;var f=new $.ias.util();function init(){$(window).scroll(scroll_handler)}init();function scroll_handler(){var a,curPageNum,curPagebreak,scrOffset,urlPage;a=f.getCurrentScrollOffset($(window));curPageNum=getCurPageNum(a);curPagebreak=getCurPagebreak(a);if(e!==curPageNum){scrOffset=curPagebreak[0];urlPage=curPagebreak[1];d.call({},curPageNum,scrOffset,urlPage)}e=curPageNum}function getCurPageNum(a){for(var i=(c.length-1);i>0;i--){if(a>c[i][0]){return i+1}}return 1}this.getCurPageNum=function(a){a=a||f.getCurrentScrollOffset($(window));return getCurPageNum(a)};function getCurPagebreak(a){for(var i=(c.length-1);i>=0;i--){if(a>c[i][0]){return c[i]}}return null}this.onChangePage=function(a){d=a};this.pushPages=function(a,b){c.push([a,b])}};$.ias.history=function(){var e=false;var f=false;function init(){f=!!(window.history&&history.pushState&&history.replaceState);f=false}init();this.setPage=function(a,b){this.updateState({page:a},'',b)};this.havePage=function(){return(this.getState()!==false)};this.getPage=function(){var a;if(this.havePage()){a=this.getState();return a.page}return 1};this.getState=function(){var a,stateObj,pageNum;if(f){stateObj=history.state;if(stateObj&&stateObj.ias){return stateObj.ias}}else{a=(window.location.hash.substring(0,7)==='#/page/');if(a){pageNum=parseInt(window.location.hash.replace('#/page/',''),10);return{page:pageNum}}}return false};this.updateState=function(a,b,c){if(e){this.replaceState(a,b,c)}else{this.pushState(a,b,c)}};this.pushState=function(a,b,c){var d;if(f){history.pushState({ias:a},b,c)}else{d=(a.page>0?'#/page/'+a.page:'');window.location.hash=d}e=true};this.replaceState=function(a,b,c){if(f){history.replaceState({ias:a},b,c)}else{this.pushState(a,b,c)}}}})(jQuery); //]]> </script><script>jQuery.ias();</script> <a href="http://www.stylifyyourblog.com" alt="Blogger Templates" >Blogger Templates and Widgets</a>

Only Home Page, Label Pages and Archive Pages
It will not work in the Post Pages

<script src='https://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js'></script> <script type='text/javascript'> //<![CDATA[ (function($){'use strict';Date.now=Date.now||function(){return+new Date()};$.ias=function(g){var h=$.extend({},$.ias.defaults,g);var i=new $.ias.util();var j=new $.ias.paging(h.scrollContainer);var k=(h.history?new $.ias.history():false);var l=this;function init(){var d;j.onChangePage(function(a,b,c){if(k){k.setPage(a,c)}h.onPageChange.call(this,a,c,b)});reset();if(k&&k.havePage()){stop_scroll();d=k.getPage();i.forceScrollTop(function(){var a;if(d>1){paginateToPage(d);a=get_scroll_threshold(true);$('html, body').scrollTop(a)}else{reset()}})}return l}init();function reset(){hide_pagination();h.scrollContainer.scroll(scroll_handler)}function scroll_handler(){var a,scrThreshold;a=i.getCurrentScrollOffset(h.scrollContainer);scrThreshold=get_scroll_threshold();if(a>=scrThreshold){if(get_current_page()>=h.triggerPageThreshold){stop_scroll();show_trigger(function(){paginate(a)})}else{paginate(a)}}}function stop_scroll(){h.scrollContainer.unbind('scroll',scroll_handler)}function hide_pagination(){$(h.pagination).hide()}function get_scroll_threshold(a){var b,threshold;b=$(h.container).find(h.item).last();if(b.size()===0){return 0}threshold=b.offset().top+b.height();if(!a){threshold+=h.thresholdMargin}return threshold}function paginate(d,e){var f;f=$(h.next).attr('href');if(!f){if(h.noneleft){$(h.container).find(h.item).last().after(h.noneleft)}return stop_scroll()}if(h.beforePageChange&&$.isFunction(h.beforePageChange)){if(h.beforePageChange(d,f)===false){return}}j.pushPages(d,f);stop_scroll();show_loader();loadItems(f,function(a,b){var c=h.onLoadItems.call(this,b),curLastItem;if(c!==false){$(b).hide();curLastItem=$(h.container).find(h.item).last();curLastItem.after(b);$(b).fadeIn()}f=$(h.next,a).attr('href');$(h.pagination).replaceWith($(h.pagination,a));remove_loader();hide_pagination();if(f){reset()}else{stop_scroll()}h.onRenderComplete.call(this,b);if(e){e.call(this)}})}function loadItems(b,c,d){var e=[],container,startTime=Date.now(),diffTime,self;d=d||h.loaderDelay;$.get(b,null,function(a){container=$(h.container,a).eq(0);if(0===container.length){container=$(a).filter(h.container).eq(0)}if(container){container.find(h.item).each(function(){e.push(this)})}if(c){self=this;diffTime=Date.now()-startTime;if(diffTime<d){setTimeout(function(){c.call(self,a,e)},d-diffTime)}else{c.call(self,a,e)}}},'html')}function paginateToPage(a){var b=get_scroll_threshold(true);if(b>0){paginate(b,function(){stop_scroll();if((j.getCurPageNum(b)+1)<a){paginateToPage(a);$('html,body').animate({'scrollTop':b},400,'swing')}else{$('html,body').animate({'scrollTop':b},1000,'swing');reset()}})}}function get_current_page(){var a=i.getCurrentScrollOffset(h.scrollContainer);return j.getCurPageNum(a)}function get_loader(){var a=$('.ias_loader');if(a.size()===0){a=$('<div class="ias_loader">'+h.loader+'</div>');a.hide()}return a}function show_loader(){var a=get_loader(),el;if(h.customLoaderProc!==false){h.customLoaderProc(a)}else{el=$(h.container).find(h.item).last();el.after(a);a.fadeIn()}}function remove_loader(){var a=get_loader();a.remove()}function get_trigger(a){var b=$('.ias_trigger');if(b.size()===0){b=$('<div class="ias_trigger"><a href="#">'+h.trigger+'</a></div>');b.hide()}$('a',b).off('click').on('click',function(){remove_trigger();a.call();return false});return b}function show_trigger(a){var b=get_trigger(a),el;el=$(h.container).find(h.item).last();el.after(b);b.fadeIn()}function remove_trigger(){var a=get_trigger();a.remove()}};$.ias.defaults={container:'.blog-posts',scrollContainer:$(window),item:'.post-outer',pagination:'#blog-pager',next:'#blog-pager-older-link a',loader:'<img src="http://1.bp.blogspot.com/-luorIIJzBBo/USnR6gOh-1I/AAAAAAAAJ_c/VEh_iQfKHqE/s1600/loading.gif"/>',loaderDelay:600,triggerPageThreshold:8,trigger:'Load more Posts',thresholdMargin:-500,history:true,onPageChange:function(){},beforePageChange:function(){},onLoadItems:function(){},onRenderComplete:function(){ FB.XFBML.parse(); gapi.plusone.go(); twttr.widgets.load(); _gaq.push(['_trackPageview']); },customLoaderProc:false};$.ias.util=function(){var c=false;var d=false;var e=this;function init(){$(window).load(function(){c=true})}init();this.forceScrollTop=function(a){$('html,body').scrollTop(0);if(!d){if(!c){setTimeout(function(){e.forceScrollTop(a)},1)}else{a.call();d=true}}};this.getCurrentScrollOffset=function(a){var b,wndHeight;if(a.get(0)===window){b=a.scrollTop()}else{b=a.offset().top}wndHeight=a.height();return b+wndHeight}};$.ias.paging=function(){var c=[[0,document.location.toString()]];var d=function(){};var e=1;var f=new $.ias.util();function init(){$(window).scroll(scroll_handler)}init();function scroll_handler(){var a,curPageNum,curPagebreak,scrOffset,urlPage;a=f.getCurrentScrollOffset($(window));curPageNum=getCurPageNum(a);curPagebreak=getCurPagebreak(a);if(e!==curPageNum){scrOffset=curPagebreak[0];urlPage=curPagebreak[1];d.call({},curPageNum,scrOffset,urlPage)}e=curPageNum}function getCurPageNum(a){for(var i=(c.length-1);i>0;i--){if(a>c[i][0]){return i+1}}return 1}this.getCurPageNum=function(a){a=a||f.getCurrentScrollOffset($(window));return getCurPageNum(a)};function getCurPagebreak(a){for(var i=(c.length-1);i>=0;i--){if(a>c[i][0]){return c[i]}}return null}this.onChangePage=function(a){d=a};this.pushPages=function(a,b){c.push([a,b])}};$.ias.history=function(){var e=false;var f=false;function init(){f=!!(window.history&&history.pushState&&history.replaceState);f=false}init();this.setPage=function(a,b){this.updateState({page:a},'',b)};this.havePage=function(){return(this.getState()!==false)};this.getPage=function(){var a;if(this.havePage()){a=this.getState();return a.page}return 1};this.getState=function(){var a,stateObj,pageNum;if(f){stateObj=history.state;if(stateObj&&stateObj.ias){return stateObj.ias}}else{a=(window.location.hash.substring(0,7)==='#/page/');if(a){pageNum=parseInt(window.location.hash.replace('#/page/',''),10);return{page:pageNum}}}return false};this.updateState=function(a,b,c){if(e){this.replaceState(a,b,c)}else{this.pushState(a,b,c)}};this.pushState=function(a,b,c){var d;if(f){history.pushState({ias:a},b,c)}else{d=(a.page>0?'#/page/'+a.page:'');window.location.hash=d}e=true};this.replaceState=function(a,b,c){if(f){history.replaceState({ias:a},b,c)}else{this.pushState(a,b,c)}}}})(jQuery); //]]> </script><script>jQuery.ias();</script> <a href="http://www.stylifyyourblog.com" alt="Blogger Templates" >Blogger Templates and Widgets</a>

Video Tutorial

Some Tips

+1 , Tweet and Like Buttons will be loaded after every AJAX request , so if you have these social sharing buttons beneath every post then don't worry about them not showing

When the new post is loaded beneath a post ( If you choose the first option ) , then the Threaded comments in the newly loaded post will not work

To replace the Loader image , just search for .gif in the Widget code and replace that whole URL with another Image

To change the number of times before the user is asked to load more pages , search for triggerPageThreshold: and replace the numeric value ahead of it , if for example you set the value as 4 then the plugin will load new content four times before it asks you weather you want to see more content or not

onRenderComplete:function() function is used to tell the plugin what to do after the page has been successfully loaded , Here I have added a snippet which tells Google Analytics that a new page is loaded so that GA registers every AJAX request as a New Page visit

loaderDelay: tell how much milliseconds to wait before the new content is actually added to the page

For information about all the other options available in this plugin visit IAS Options

If you face any troubles in implementing , feel free to ask me via comments

Til next time,
Prayag Verma at 18:17

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