I am working on a small project using ExtJS currently.
The development environment: Eclipse IDE with Aptana Plugin 3, and Spket Plugin, with ExtJS 4.1 code assist.
(1) Install Aptana plugin, in the menu, windows-> install new softwares-> add, and use following link:
Http://download.aptana.com/studio3/plugin/install
(2) Install the Spket, again windows-> install new softwares-> add, and use following link:
Http://www.agpad.com/update/
(3) After then we need to install ExtJS code assist.
There are using toturials but only this gives almost correct guide.
Http://www.spket.com/extjs.html
There is still a small mistake that before selecting the sdk. jsb3, we need to first move it from the "build" folder to the root folder (see http://forums.spket.com/viewtopic.php? F = 6 & t = 3656), after all these you need to restart your eclipse, then the code assister will work.
After these steps we can create web project, new project-> Web Project-> Default Project.
Reference:
Http://forums.spket.com/viewtopic.php? F = 3 & t = 3667
Http://stackoverflow.com/questions/11404760/cannot-install-aptana-plugin-on-eclipse-4-2