Category Archives: Software

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One of the things that I thought it’d be cool to be able to do with Idno, is to be able to embed a post into a blog post, rather like you can with a tweet or public Facebook posting.

Embedding posts mean that you can take a posting that you or someone else has written on their Idno site, and then build up a conversation around it.


So, I wrote a quick plugin that provides this functionality!

This current version uses an iframe to display an embed view of the selected object, using code inserted using the JSONP api, which gives you a live view of the object complete with latest comment count and using your site’s theme choices. Future versions of the plugin may make more use of the raw data returned via the JSONP endpoint.

All links will open in a new tab, so if you want to see the comments (or comment directly, if the site in question uses my in place comments plugin), then you can follow links without causing problems.

Have fun!

» Visit the project on Github…

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idnoJSONP, or json with padding, is a technique hack that allows you to retrieve json content from a remote page, and pass that content to a Javascript function, without falling foul of the browser XSS same origin policy.

Idno has had a JSON view of it’s data objects for some time, but up until now it has been hard to call that data from within javascript, unless you were doing it from the same domain.

So, I sent Ben a pull request which adds JSONP support to Idno core, together with some enhancements to the data the standard JSON view provides.

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elgg_logo1 Here’s the scenario; you’re a developer and you’ve been asked to do some work on an existing Elgg site, or you’ve built an Elgg site with some complex plugin interdependencies that you need to copy on to a live site.

In both cases, this primarily involves copying the source code and Elgg database from one site to another, here’s how…

Source code and database

  1. Install the source code for your project; scp it from the other site, git clone –recursive, whatever…
  2. On the site you’re copying, take a dump of the database. You can look in your engine/settings.php for the database username and password:

    mysqldump -u your-db-user -p elgg_database > database-dump.sql

  3. Copy this file onto your new host.
  4. Create a new database and install the Elgg database into it, in the mysql client do the following:

    create database new_elgg_database;
    grant all on new_elgg_database.* to `db_username`@`localhost` identified by 'db-password';
    use new_elgg_database;
    source /path/to/database-dump.sql

  5. You should now have a local copy of the elgg database installed, but in order for it to work you need to change a few paths. Firstly, alter your dataroot and site location details in your prefix_datalists table:

    update elggdatalists set value="/path/to/elgg/" where name="path";
    update elggdatalists set value="/path/to/dataroot/" where name="dataroot";

    Don’t forget the trailing slash on the paths!

  6. Next, you need to update the site url in the site object stored in the prefix_sites_entity table. For the vast majority of people (who only have one site object) this will be straightforward, for others, you might have to use a slightly different query in order to get all sites working as expected.

    update elggsites_entity set url="http://localhost/path/to/site/";

    Again, don’t forget the trailing slash on the URL!

  7. Finally, alter your copy of engine/settings.php to reflect your new database details.

When I view my site, all the CSS is broken!

This is almost certainly a mod-rewrite problem.

  • Firstly, check that it’s installed and enabled, and that overrides are enabled for your site URL (common problem if installing into ~/public_html).
  • Next, make sure that your RewriteBase is configured. If you’re installing into a subdirectory on a domain (e.g. http://localhost/~marcus/elgg/) you’ll need to set the RewriteBase in your .htaccess file accordingly, in the case of my example, RewriteBase /~marcus/elgg/

Files

The above should get you up and running with a usable site for testing, however if you want to fully migrate a site, you’ll also need to copy the data directory across.

  1. Using rsync or similar copy the complete data directory from your old site’s data directory to the new.
  2. Ensure that the directory, subdirectories and files are read and writeable by your web server’s user.
  3. Flush the caches. This is important since Elgg caches the locations of template files and other data in the data directory, which obviously will cause issues if you copy a cache file from another location! If the admin panel has become unavailable at this point, deleting the system_cache directory from dataroot by hand will often restore it.

Happy hacking!