The API documentation can be found at http://dev.sencha.com/deploy/dev/docs/
An excellent source for learning Ext JS are the YouTube tutorials by Jay Garcia from TDG-innovations (http://tdg-i.com/ has the screencasts with a better quality than those on YouTube). Some topics they have covered include:
- Ext.extend - subclassing with Ext JS
- Ext.apply - a utility that allows one to easily copy properties over from one object to anothe
- Ext.each - an alternative to a for loop, used to iteratie over an array (this one gets a little hairy in the screencast, I'm not sure how useful it really is)
- Containers (Ext.Panel, Ext.Window - add, remove, doLayout, Ext.Element, Ext.Fx - slideOut, fadeOut)
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