Few months ago I started some experiments with jQuery plugin. I found some tutorials on the Interenet and I started to put something together.
A couple of days ago I had the need to build my own "plugin" and got back to my old project. Trying to find some more informations on the internet, I bumped in these new "things" called widgets.
For what I understand I should forget about plugins and start developing widgets. Are the plugins an old concept or are still valid? What is the best approach if you need a custom jquery control with interface?
I am using extensively jQuery UI.
You can either write a jQuery plugin or a jQuery UI widget.
Depends on what you want to do. Neither of these is outdated. If you write a widget, it will depend on jQuery UI (and jQuery of course), if you write a plugin, it will only depend on jQuery. Really, it depends on what you want to achieve.