Interface IHasData

An interface class of a component which has data or can bind data with. All classes implementing this interface must provide the data mechanism to the user. A single data parent may have one or more data children. When parent's data is changed, the parent will propogate the data change to all of its children. The method isDataDirty provides you the way to check that the data has been edited from its original state or not. This mechanism is very useful when you're developing an application which allows the user to edit data before save. When the user is leaving the page with unsaved data, the application may notify a warning message asking the user to save the data before leaving. Imagine that if your page contains a numerous of input components, by using the data mechanism provided by this interface, you can easily register those input components as page's data children. And, when you want to check that the user can leave this page or not, you just use the method isDataDirty on page component, it will automatically check the data dirty state on all of its data children.