Top Commentators Widget with Avatars for Blogger

The commentators are a fundamental part of any blog, since they are the ones that give life to the blog, opening and replying to discussions which leads to more activity in the posts.

It is therefore very important to know which are the most active users of your blog, the users who leave more comments, and for this reason, today I present a great method to display a list with the top commentators.

The gadget will look something like this:

This Top Commentators gadget comes with user's avatar and is done with JavaScript.

How to Add the Top Commenters Gadget to Blogger

1. To add this gadget, you have to go to Layout, click on Add a Gadget link.

2. Select the HTML/JavaScript gadget and copy/paste within the empty box the following code:

<style type="text/css">
.top-commentators {
margin: 3px 0;
border-bottom: 1px dotted #ccc;
}
.avatar-top-commentators {
vertical-align:middle;
border-radius: 30px;
}
.top-commentators .commenter-link-name {
padding-left:0;
}
</style>
<script type="text/javascript">
var maxTopCommenters = 8;  
var minComments = 1;       
var numDays = 0;           
var excludeMe = true;      
var excludeUsers = ["Anonymous", "someotherusertoexclude"];   
var maxUserNameLength = 42;
//
var txtTopLine = '<b>[#].</b> [image] [user] ([count])';
var txtNoTopCommenters = 'No top commentators at this time.';
var txtAnonymous = '';
//
var sizeAvatar = 33;
var cropAvatar = true;
//
var urlNoAvatar = "https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj-QPh6D5mNz35STy1a-id8D9H4b4aPrNU3L7MJRFPrJVPygc8g7CW5r6dIURsTDMkyamPhauFwatCp-QLkYgO9RTL7-6tMj_S78fHqJP3DR_eUejsEiSygRzv40ZOp-S3ToRmf65Mavd_e/s1600/avatar_blue_m_96.png" + sizeAvatar;
var urlAnoAvatar = 'https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiFLjM3tmGOYihyphenhyphen9IHqYhlndy1B6_Roiru76NgRrhKH8GkT51szF9HGrr_Uob8q8LVxsiOlYU0ZbjCuTh1Qv2_qGn1n2XGihDAJPg2KVDc00s6SZmuGud1PcjQJDE9MJ6N8VsSrnLS9LeGJ/s1600/avatar1.png' + sizeAvatar;
var urlMyProfile = '';
var urlMyAvatar = '';

if(!Array.indexOf) {
 Array.prototype.indexOf=function(obj) {
  for(var i=0;i<this.length;i++) if(this[i]==obj) return i;
  return -1;
}}
function replaceTopCmtVars(text, item, position)
{
  if(!item || !item.author) return text;
  var author = item.author;

  var authorUri = "";
  if(author.uri && author.uri.$t != "")
    authorUri = author.uri.$t;

  var avaimg = urlAnoAvatar;
  var bloggerprofile = "http://www.blogger.com/profile/";
  if(author.gd$image && author.gd$image.src && authorUri.substr(0,bloggerprofile.length) == bloggerprofile)
    avaimg = author.gd$image.src;
  else {
    var parseurl = document.createElement('a');
    if(authorUri != "") {
      parseurl.href = authorUri;
      avaimg = 'http://www.google.com/s2/favicons?domain=' + parseurl.hostname;
    }
  }
  if(urlMyProfile != "" && authorUri == urlMyProfile && urlMyAvatar != "")
    avaimg = urlMyAvatar;
  if(avaimg == "http://img2.blogblog.com/img/b16-rounded.gif" && urlNoAvatar != "")
    avaimg = urlNoAvatar;
  var newsize="s"+sizeAvatar;
  avaimg = avaimg.replace(/\/s\d\d+-c\//, "/"+newsize+"-c/");
  if(cropAvatar) newsize+="-c";
  avaimg = avaimg.replace(/\/s\d\d+(-c){0,1}\//, "/"+newsize+"/");

  var authorName = author.name.$t;
  if(authorName == 'Anonymous' && txtAnonymous != '' && avaimg == urlAnoAvatar)
    authorName = txtAnonymous;
  var imgcode = '<img class="avatar-top-commentators" height="'+sizeAvatar+'" width="'+sizeAvatar+'" title="'+authorName+'" src="'+avaimg+'" />';
  if(authorUri!="") imgcode = '<a href="'+authorUri+'">'+imgcode+'</a>';

  if(maxUserNameLength > 3 && authorName.length > maxUserNameLength)
    authorName = authorName.substr(0, maxUserNameLength-3) + "...";
  var authorcode = authorName;
  if(authorUri!="") authorcode = '<a class="commenter-link-name" href="'+authorUri+'">'+authorcode+'</a>';

  text = text.replace('[user]', authorcode);
  text = text.replace('[image]', imgcode);
  text = text.replace('[#]', position);
  text = text.replace('[count]', item.count);
  return text;
}

var topcommenters = {};
var ndxbase = 1;
function showTopCommenters(json) {
  var one_day=1000*60*60*24;
  var today = new Date();

  if(urlMyProfile == "") {
    var elements = document.getElementsByTagName("*");
    var expr = /(^| )profile-link( |$)/;
    for(var i=0 ; i<elements.length ; i++)
      if(expr.test(elements[i].className)) {
        urlMyProfile = elements[i].href;
        break;
      }
  }

  if(json && json.feed && json.feed.entry && json.feed.entry.length) for(var i = 0 ; i < json.feed.entry.length ; i++ ) {
    var entry = json.feed.entry[i];
    if(numDays > 0) {
      var datePart = entry.published.$t.match(/\d+/g);
      var cmtDate = new Date(datePart[0],datePart[1]-1,datePart[2],datePart[3],datePart[4],datePart[5]);
     
      var days = Math.ceil((today.getTime()-cmtDate.getTime())/(one_day));
      if(days > numDays) break;
    }
    var authorUri = "";
    if(entry.author[0].uri && entry.author[0].uri.$t != "")
      authorUri = entry.author[0].uri.$t;

    if(excludeMe && authorUri != "" && authorUri == urlMyProfile)
      continue;
    var authorName = entry.author[0].name.$t;
    if(excludeUsers.indexOf(authorName) != -1)
      continue;

    var hash=entry.author[0].name.$t + "-" + authorUri;
    if(topcommenters[hash])
      topcommenters[hash].count++;
    else {
      var commenter = new Object();
      commenter.author = entry.author[0];
      commenter.count = 1;
      topcommenters[hash] = commenter;
    }
  }
  if(json && json.feed && json.feed.entry && json.feed.entry.length && json.feed.entry.length == 200) {
    ndxbase += 200;
    document.write('<script type="text/javascript" src="http://'+window.location.hostname+'/feeds/comments/default?redirect=false&max-results=200&start-index='+ndxbase+'&alt=json-in-script&callback=showTopCommenters"></'+'script>');
    return;
  }

  // convert object to array of tuples
  var tuplear = [];
  for(var key in topcommenters) tuplear.push([key, topcommenters[key]]);

  tuplear.sort(function(a, b) {
    if(b[1].count-a[1].count)
        return b[1].count-a[1].count;
    return (a[1].author.name.$t.toLowerCase() < b[1].author.name.$t.toLowerCase()) ? -1 : 1;
  });

  var realcount = 0;
  for(var i = 0; i < maxTopCommenters && i < tuplear.length ; i++) {
    var item = tuplear[i][1];
    if(item.count < minComments)
        break;
    document.write('<di'+'v class="top-commentators">');
    document.write(replaceTopCmtVars(txtTopLine, item, realcount+1));
    document.write('</d'+'iv>');
    realcount++;
  }
  if(!realcount)
    document.write(txtNoTopCommenters);
}
document.write('<script type="text/javascript" src="http://'+window.location.hostname+'/feeds/comments/default?redirect=false&max-results=200&alt=json-in-script&callback=showTopCommenters"></'+'script>');
</script>

3. Now you just have to save changes and you're done!

Configuration

- To modify the number of users displayed in the gadget, look for var maxTopCommenters = 8; and change 8 with any number you want.
- To change the avatar size of the commenters, look for var sizeAvatar = 33; and change number 33 with the number of pixels you want.

Redirect Blogger 404 Error (Page Not Found) To Homepage

Whenever, by mistake, we or a user misspells an URL inexistent in our blog, it automatically redirects to the 404 error page (page not found). A message like this would appear:

"Sorry, the page you were looking for in this blog does not exist."

And probably this will not make a good impression on the greatest potential users of our blog. Before the user clicks the back button or close the window/browser's tab, thus leaving our site forever, we may want to redirect 404 error in Blogger to a page, where are chances that the visitor will continue reading our blog.

One of the most used methods is the "meta refresh" but the problem with this method is that it breaks navigation (doesn't allow returning back). In this case, the best method is by using Javascript which will be shown below.

Redirect Blogger 404 Error with Javascript

First of all, go to your Blogger dashboard and then to Settings > Search preferences > Custom Page Not Found.

Copy and paste the following code:

Sorry, the page you're looking for in this blog does not exist.
You will be redirected to homepage shortly.
<script type = "text/javascript">
BSPNF_redirect = setTimeout(function() {
location.pathname= "/"
}, 5000);
</script>

The message which is going to be displayed can be edited as you want. If you are willing to redirect your blog 404 error page to another page other than your home page, just replace pathname to href and / with the url of your page. And finally, the number 5000 is the delay expressed in milliseconds. You can edit any value if this is more convenient.

Next thing to do is to save all changes made in this section and do a little test to check if the code works well. You can enter a nonexistent URL on your blog, and see if the 404 error page added previously appears, followed by a redirection after 5 seconds. That's it!