widget is a subset of the Window
widget, where the most prominent difference is the added functionality for actions and predefined dialogs. Sadly there is no list of differences between both or a decision tree regarding usage.
The Dialog brings information to the user via a popup, provides actions possibilities through the action buttons and prompts the user for input or to asks for a decision. The Window can display both modal or non-modal content and additionally display ajax loaded content.
You can review the API reference for the Dialog
and the Window
widgets for additional information on configuration possibilities, methods and events.
I hope this help. Let me know if you have futher questions.
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