Mouse-over Chat-text to make custom acheivment message.

I'm an advanced plugin developer but I never really used my time to take advantage of the new 1.7 resources and such. In the HOLOAPI video, at 10:47 , Samkio hovers over the text to show a custom acheivment message. How would I do this myself? I would like to make it so you can hover of a players name and it will show you their health and hunger. Anybody have any idea as to how I would be able to do this? Also I would like to say thank you in advance!

 

Muod I'm not entirely certain what you mean, and I don't intend to watch a video to find out, especially if I have to go looking for that video myself. But I think I have this right:

You want the player to be able to hover their mouse over some text in the chat, and a little box with info comes up, right? If you do, they're done with JSON messages. Google search for how they're formatted on minecraft. And I don't think there's a way to send them in the bukkit api, but I know there's a library/tutorial for it.

 

You could do this with packets, but I would just use an API like Fanciful.