You should not read this post. It describes a bad practice.
Using Calculated Fields in ExtJS and Sencha Touch
Calculated fields are fields that do not have their own values, but the values are calculated from the other fields of the same record. It is easiest to implement them in Model.
Ext/Touch Component Life Cycle
Knowing the phases of component life cycle is important for every developer. Learn what the phases are and what is happening in each of them.
What is an event?
Event are often misunderstood as to their origin, purpose and handling. You can find in-depth definition of events which knowledge gives you the potential ability to effectively use them in your applications whether small or large.
