If you do not have a deep understanding of how ExtJS class system work, you may want to follow this: Declare all non-primitive types in initComponent(). Terminology Primitive types – strings, booleans, integers, etc. Non-Primitives – arrays & objects. Explanation If the component you extend is to be created more than once, any non-primitive configs … Read more
There are severe gotchas with using IDs and getCmp to find your components. The primary issue is that you can not reuse the component safely because in most cases the markup will create HTML elements with duplicate IDs, which is invalid HTML. Additionally, when you have two components with the same ID you will run … Read more
For clarification: By real class modification I mean a intended permanent modification/extension of a class, which should always be done by extending a class. But it is not a temporary solution for just a specific problem (bug-fix, etc.). You have at least four options how to override members of (Ext) Classes prototype I guess is … Read more