ZK Developer's Reference/MVVM/ViewModel/Initialization

The binder is responsible for creating and initializing ViewModel instance. If you want to perform your own initialization in a ViewModel, you can declare your own initial method by applying @Init on it. Binder will invoke this method when initializing a ViewModel. Each ViewModel can only have one initial method.

public class MyViewModel {

	@Init
	public void init(){
		//initialization code
	}
}

This annotation has an element "upward", if you set it to "true". The binder will look for the initial method of ViewModel's parent class and invoke it first if it exists.

public class ParentViewModel{

	@Init
	public void init(){
		//initialization code
	}
}


public class ChildViewModel extends ParentViewModel{

	@Init(upward=true)
	public void init(){
		//initialization code
	}
}

• ParentViewModel's initial method is invoked first then ChildViewModel's.

The initial method can retrieve various context object by applying annotation on its parameter, please refer ZK Developer's Reference/MVVM/Advance/Parameters.

Version History

Version	Date	Content
6.0.0	February 2012	The MVVM was introduced.