Adding related post Widget with responsive thumbnails to blogger or blogger post

STEP 1: Log into your blogger account and go to themes > Edit HTML

STEP 2: Click anywhere inside the code area and press the Ctrl + F keys

STEP 3: Type </head> into the search box and click enter; then copy and paste the code below just before/above the </head> tag 

<!--Related Posts with thumbnails Scripts and Styles Start-->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<style type='text/css'>
#related-posts{float:left;width:auto;}
#related-posts a{border-right: 1px dotted #eaeaea;}
#related-posts h4{margin-top: 10px;background:none;font:18px Oswald;padding:3px;color:#999999; text-transform:uppercase;}
#related-posts .related_img {margin:5px;border:2px solid #f2f2f2;object-fit: cover;width:110px;height:100px;-webkit-border-radius: 5px;-moz-border-radius: 5px; border-radius: 5px; }
#related-title {color:#333;text-align:center;text-transform:capitalize;padding: 0px 5px 10px;font-size:12px;width:110px; height: 40px;}
</style>
<script type='text/javascript'>
//<![CDATA[
var relatedTitles=new Array();var relatedTitlesNum=0;var relatedUrls=new Array();var thumburl=new Array();function related_results_labels_thumbs(json){for(var i=0;i<json.feed.entry.length;i++){var entry=json.feed.entry[i];relatedTitles[relatedTitlesNum]=entry.title.$t;try{thumburl[relatedTitlesNum]=entry.gform_foot.url}catch(error){s=entry.content.$t;a=s.indexOf("<img");b=s.indexOf("src=\"",a);c=s.indexOf("\"",b+5);d=s.substr(b+5,c-b-5);if((a!=-1)&&(b!=-1)&&(c!=-1)&&(d!="")){thumburl[relatedTitlesNum]=d}else thumburl[relatedTitlesNum]='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgEqXrr8okli1A3Qmwklqplh-PA8uM-8CZkRT1JTXJc2iC6DrRuDorkF6YUcM6LwIl48fqZRwNPRGFHpWog8z9yGGUzdLZVJVleAJDw-QFSwMgwUVIM2ofAVt_k5xhuSBfXlcya3LlxcDCi/s1600/no-thumbnail.png'}if(relatedTitles[relatedTitlesNum].length>35)relatedTitles[relatedTitlesNum]=relatedTitles[relatedTitlesNum].substring(0,35)+"...";for(var k=0;k<entry.link.length;k++){if(entry.link[k].rel=='alternate'){relatedUrls[relatedTitlesNum]=entry.link[k].href;relatedTitlesNum++}}}}function removeRelatedDuplicates_thumbs(){var tmp=new Array(0);var tmp2=new Array(0);var tmp3=new Array(0);for(var i=0;i<relatedUrls.length;i++){if(!contains_thumbs(tmp,relatedUrls[i])){tmp.length+=1;tmp[tmp.length-1]=relatedUrls[i];tmp2.length+=1;tmp3.length+=1;tmp2[tmp2.length-1]=relatedTitles[i];tmp3[tmp3.length-1]=thumburl[i]}}relatedTitles=tmp2;relatedUrls=tmp;thumburl=tmp3}function contains_thumbs(a,e){for(var j=0;j<a.length;j++)if(a[j]==e)return true;return false}function printRelatedLabels_thumbs(){for(var i=0;i<relatedUrls.length;i++){if((relatedUrls[i]==currentposturl)||(!(relatedTitles[i]))){relatedUrls.splice(i,1);relatedTitles.splice(i,1);thumburl.splice(i,1);i--}}var r=Math.floor((relatedTitles.length-1)*Math.random());var i=0;if(relatedTitles.length>0)document.write('<h4>'+relatedpoststitle+'</h4>');document.write('<div style="clear: both;"/>');while(i<relatedTitles.length&&i<20&&i<maxresults){document.write('<a style="text-decoration:none;margin:0 4px 10px 0;float:left;');if(i!=0)document.write('"');else document.write('"');document.write(' href="'+relatedUrls[r]+'"><img class="related_img" src="'+thumburl[r]+'"/><br/><div id="related-title">'+relatedTitles[r]+'</div></a>');if(r<relatedTitles.length-1){r++}else{r=0}i++}document.write('</div>');relatedUrls.splice(0,relatedUrls.length);thumburl.splice(0,thumburl.length);relatedTitles.splice(0,relatedTitles.length)}
//]]>
</script>
</b:if>
<!--Related Posts with thumbnails Scripts and Styles End-->

TAKE NOTE:
You can edit the width and height of thumbnails; modify the 110px and 100px values in RED above
To change the colour and size of related post titles, change the values in BLUE
Remove the lines in GREEN if you want related posts to display both in homepage and posts pages

STEP 4: Using the search box, find the tag <div class='post-footer'> (You will find two but you need to stop at the second one). Now, paste the code below just before/above the <div class='post-footer'> tag

<!-- Related Posts with Thumbnails Code Start-->
<b:if cond='data:blog.pageType == &quot;item&quot;'>
<div id='related-posts'>
<b:loop values='data:post.labels' var='label'>
<b:if cond='data:label.isLast != &quot;true&quot;'>
</b:if>
<script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=related_results_labels_thumbs&amp;max-results=5&quot;' type='text/javascript'/></b:loop>
<script type='text/javascript'>
var currentposturl=&quot;<data:post.url/>&quot;;
var maxresults=5;
var relatedpoststitle=&quot;<b>Related Posts:</b>&quot;;
removeRelatedDuplicates_thumbs();
printRelatedLabels_thumbs();
</script>
</div><div class='clear'/><div style="font-size: 9px;float: right; margin: 5px;"><a  style="font-size: 9px; text-decoration: none;" href="https://helplogger.blogspot.com/2012/03/how-to-add-related-posts-widget-to.html" rel="nofollow" >Related Posts Widget</a></div>
</b:if>
<!-- Related Posts with Thumbnails Code End-->

TAKE NOTE:
Change the 5 value from maximum results = 5 to the number of related posts you want to be displayed
Customize the related posts and related posts widgets to the desired namesw of you want or decide
Remove the lines in GREEN if you want related posts to display both in homepage and posts pages
.
If you are unable to see the related posts widget after saving your template,then proceed to step 5

STEP 5: Using the search button find the code </b:includable>, then copy the code <div class= 'post-footer'> and paste it just above or before the </b:includable> tag

Since there are multiple </b:includable> tags, you can just search for id='postQuickEdit' var='post'>; the <</b:includable>> is directly above the <<b: includable  id='postQuickEdit' var='post'>

.
Save your template and enjoy
.
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