Today we continue a series of articles on the creation of powerful chat system. Our third lesson will contain next elements: join form (with html5 validation). A long ago, I have already made similar validation. So you can refresh your memories if you like.

Today I will publish updated sources of our growing project (several files was modified, plus I expanded structure of database slightly). All project is well structured: system classes is in ‘classes’ folder, stylesheets in ‘css’ folder, template files in ‘templates’ folder, and – new folder ‘js’ for javascript files.