Add a sequence to list SharePoint 2010

I was able to achieve this using JavaScript. Steps

1. Open the NewForm page of the list. Example http://webappurl/sitecollection/site/lists/listname/newform.aspx
2. Click Site Actions and Edit Page
3. Add new web part -> Content Editor Web Part

4. Edit HTML and insert below code

   <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
   
   <script>
       function pad(num, size) {
           var s = num+"";
           while (s.length < size) s = "0" + s;
           return s;
       }
   
       //CHANGE SITECOLLECTION URL
       var siteUrl = '/sitecollection/site';
       function retrieveListItems() {
           var clientContext = new SP.ClientContext(siteUrl);
           //CHANGE test TO THE ACTUAL LIST NAME
           var oList = clientContext.get_web().get_lists().getByTitle('test');
   
           var camlQuery = new SP.CamlQuery();
           camlQuery.set_viewXml('<View><Query><OrderBy><FieldRef Name="ID" Ascending="FALSE" /></OrderBy></Query><RowLimit>1</RowLimit></View>');
           this.collListItem = oList.getItems(camlQuery);
   
           clientContext.load(collListItem);
   
           clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed))
       }
   
       function onQuerySucceeded(sender, args) {
           if(collListItem.get_count() == 0) {
               $('input[title^="Sequence"]').val('000001');
               return;
           }
           var listItemEnumerator = collListItem.getEnumerator();
           while (listItemEnumerator.moveNext()) {
               var oListItem = listItemEnumerator.get_current();
               var maxId = oListItem.get_id();
               maxId = maxId + 1
   
               var nextSequence = pad(maxId, 6);
   
               $('input[title^="Sequence"]').val(nextSequence);
           }    
       }
   
       function onQueryFailed(sender, args) {
   
           alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
       }
   
       ExecuteOrDelayUntilScriptLoaded(retrieveListItems, "sp.js");
   </script>