Random Posts With Thumbnail and Summary for Blogger

If you want to increase the number of page impression, this widget might help you.The Random Posts Widget will show random posts you have added to your blog. The main advantages of this widget is that it is loading pretty fast and shows thumbnails of your posts too, along with the comments link. Random posts are displaying a page at random regardless of the date published. Therefore here we will discuss how to display random posts in blogger widget.
Login into your blogger account, And Select Text/Html Gadget. Copy code below and paste inside that gadget. Don't forget to save the gadget.

<style>
<!--
#random-posts img{float:left;margin-right:10px;border:1px solid #999;background:#FFF;width:72px;height:72px;padding:3px}
-->
</style>
<ul id='random-posts'>
<script type='text/javaScript'>
var rdp_numposts=5;
var rdp_snippet_length=60;
var rdp_info='yes';
var rdp_comment='Comment';
var rdp_disable='';
var rdp_current=[];var rdp_total_posts=0;var rdp_current=new Array(rdp_numposts);function totalposts(json){rdp_total_posts=json.feed.openSearch$totalResults.$t}document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&max-results=0&callback=totalposts\"><\/script>');function getvalue(){for(var i=0;i<rdp_numposts;i++){var found=false;var rndValue=get_random();for(var j=0;j<rdp_current.length;j++){if(rdp_current[j]==rndValue){found=true;break}};if(found){i--}else{rdp_current[i]=rndValue}}};function get_random(){var ranNum=1+Math.round(Math.random()*(rdp_total_posts-1));return ranNum};
</script>
<script type='text/javaScript'>
function random_posts(json){a=location.href;y=a.indexOf('?m=0');for(var i=0;i<rdp_numposts;i++){var entry=json.feed.entry[i];var rdp_posttitle=entry.title.$t;if('content'in entry){var rdp_get_snippet=entry.content.$t}else{if('summary'in entry){var rdp_get_snippet=entry.summary.$t}else{var rdp_get_snippet="";}};rdp_get_snippet=rdp_get_snippet.replace(/<[^>]*>/g,"");if(rdp_get_snippet.length<rdp_snippet_length){var rdp_snippet=rdp_get_snippet}else{rdp_get_snippet=rdp_get_snippet.substring(0,rdp_snippet_length);var space=rdp_get_snippet.lastIndexOf(" ");rdp_snippet=rdp_get_snippet.substring(0,space)+"&#133;";};for(var j=0;j<entry.link.length;j++){if('thr$total'in entry){var rdp_commentsNum=entry.thr$total.$t+' '+rdp_comment}else{rdp_commentsNum=rdp_disable};if(entry.link[j].rel=='alternate'){var rdp_posturl=entry.link[j].href;if(y!=-1){rdp_posturl=rdp_posturl+'?m=0'}var rdp_postdate=entry.published.$t;if('media$thumbnail'in entry){var rdp_thumb=entry.media$thumbnail.url}else{rdp_thumb="https://lh6.googleusercontent.com/-DyZeFWzDdww/UJkgeoWm13I/AAAAAAAAANA/KKrXbBx77IM/s72/no-image.png"}}};document.write('<li>');document.write('<img alt="'+rdp_posttitle+'" src="'+rdp_thumb+'"/>');document.write('<div><a href="'+rdp_posturl+'" rel="nofollow" title="'+rdp_snippet+'">'+rdp_posttitle+'</a></div>');if(rdp_info=='yes'){document.write('<span>'+rdp_postdate.substring(8,10)+'/'+rdp_postdate.substring(5,7)+'/'+rdp_postdate.substring(0,4)+' - '+rdp_commentsNum)+'</span>'}document.write('<div style="clear:both"></div></li>')}};getvalue();for(var i=0;i<rdp_numposts;i++){document.write('<script type=\"text/javascript\" src=\"/feeds/posts/default?alt=json-in-script&start-index='+rdp_current[i]+'&max-results=1&callback=random_posts\"><\/script>')};
</script>
</ul>

Now you will see Random Posts with thumbnail on your blog
Note: 
Replace numposts=5 with the number of posts you want to be show.
info='yes'; Show date and comment. Set no if you don't want to show it