How To Add Auto ‘Read More’ Feature with Thumbnails

It nice trick will automatically create post summaries with the help of thumbnails. You don't need to add any extra html code in every blogger post that you make

1.Go to "Template" --> "Edit HTML" of your blog.
2.Click on "Expand Widget Templates"
3.Scroll down to where you see </head> tag.
4.Now add below code just before </head> tag.

<script type='text/javascript'>
summary_noimg = 250;
summary_img = 200;
img_thumb_height = 150;
img_thumb_width = 150; 
</script>
<script type='text/javascript'>
//<![CDATA[

function removeHtmlTag(strx,chop){ 
 if(strx.indexOf("<")!=-1)
 {
  var s = strx.split("<"); 
  for(var i=0;i<s.length;i++){ 
   if(s[i].indexOf(">")!=-1){ 
    s[i] = s[i].substring(s[i].indexOf(">")+1,s[i].length); 
   } 
  } 
  strx =  s.join(""); 
 }
 chop = (chop < strx.length-1) ? chop : strx.length-2; 
 while(strx.charAt(chop-1)!=' ' && strx.indexOf(' ',chop)!=-1) chop++; 
 strx = strx.substring(0,chop-1); 
 return strx+'...'; 
}

function createSummaryAndThumb(pID){
 var div = document.getElementById(pID);
 var imgtag = "";
 var img = div.getElementsByTagName("img");
 var summ = summary_noimg;
 if(img.length>=1) { 
  imgtag = '<span style="float:left; padding:0px 10px 5px 0px;"><img src="'+img[0].src+'" width="'+img_thumb_width+'px" height="'+img_thumb_height+'px"/></span>';
  summ = summary_img;
 }

 var summary = imgtag + '<div>' + removeHtmlTag(div.innerHTML,summ) + '</div>';
 div.innerHTML = summary;
}

//]]>
</script>

Note : You can change below values as your choice.
summary_noimg : number of character to display when there is no image.
summary_img : number of character to display when there is an image.
img_thumb_height : hight of the post thumbnails.
img_thumb_width : width of the post thumbnails.

5.Now Scroll down to where you see this:

<data:post.body/>

6.Replace above code with below code.

<b:if cond='data:blog.pageType != "static_page"'>
<b:if cond='data:blog.pageType != "item"'>
<div expr:id='"summary" + data:post.id'><data:post.body/></div>
<script type='text/javascript'>createSummaryAndThumb("summary<data:post.id/>");</script>
</b:if>
</b:if>
<b:if cond='data:blog.pageType == "item"'><data:post.body/></b:if>

<b:if cond='data:blog.pageType == "static_page"'><data:post.body/></b:if>

<b:if cond='data:blog.pageType != "static_page"'>
<b:if cond='data:blog.pageType != "item"'>
<div style='float:right;margin-right:10px;margin-top:5px;'>
<a expr:href='data:post.url'>Read More</a>
</div>
</b:if>
</b:if>

7.Now save your template and you are done.