why does vb use javascript?

[Dionysis]

why does Vbulletin use Javascript? does it do stuff that PHP could not do?

[Andreas]

PHP = Server Side
JavaScript = Client Side

With PHP, you can't do things on your computer like displaying a Popup or Dialog, while on the other side with JavaScript you can't do things on the server like querying the database.

[Colin F]

why does Vbulletin use Javascript? does it do stuff that PHP could not do?
Yes, as Javascript is not server side, it allows for some execution even after the page is done loading, which php does not allow. Examples for these are the options to check all checkboxes.

[T3MEDIA]

Cant Java be serverside as well?

[Zachery]

Cant Java be serverside as well?
There is a MASSIVE difference between Java and Javascript.

Its like the difference between C++ and html