Use the tags of a blog to add 'categories'. Then look at the Blog Tools plugin. It offers an additional route to a page with all the blog with the same tag (eg. /blog/tag/MyTag) including archive support.

With this configuration, you're better off staying on Elgg 3.

Just update on the latest version.

If you want the most stability than use the LTS version of Elgg (currently 3.3) If you wish to use the newest features use the latest stable release (currently 4.0).

I know plugin support is important, that is up to the individual developer of a plugin which versions they wish to support.

We (ColdTrick, Jeroen Dalsem and me) only support the latest release of Elgg. The older versions of the plugins still work but bugs will only be solved for the latest release of Elgg.

Also have a look at the Elgg support policy to find out what works best for your use case. http://learn.elgg.org/en/stable/appendix/support.html

Thank @jerome, 

I spent some time on the lightbox options, but I didn't find any useful for my problem.

Does anyone have any solutions for me?

It's a question about JS experience.

Look at jQuery API.

I read a lot about jquery colorbox.

Here is the only way to do.

The first colorbox instance should to load in an iframe. In this iframe we can load another colorbox.

My issue now is how can I load an ajax view in an iframe ? I am using  ajax view to create entity through a lightbox. 

elgg_register_menu_item('title', [

      'is_trusted' => true,

      'name' => 'addbusinessdirectory',

      'text' => "Add an entity",

      'title' => elgg_echo('add:object:pessekcompany:title'),

      'icon' => 'plus', 

      'link_class' => ['elgg-button', 'elgg-button-action', 'mrs', 'elgg-lightbox'],

      'href' => elgg_http_add_url_query_elements('ajax/view/pessek_company/add', [

                'guid' => $param1,

                 'container_guid' => $param2,

      ]),

      'data-colorbox-opts' => json_encode([

                'maxHeight' => '85%',

                'maxWidth' => '90%', 

                'width' => '60%',

                'iframe' => true,

      ]),

]);