How to obtain instance of DataContext outside of Screen controller - Githubissues

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CUBA Platform Documentation

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How to obtain instance of DataContext outside of Screen controller #714

Closed alexbudarov closed 4 years ago

alexbudarov commented 4 years ago

Environment

Documentation version: 7.2
Existing page: https://doc.cuba-platform.com/manual-7.2/gui_DataContext.html

Description of the bug or enhancement

Example case - https://www.cuba-platform.com/discuss/t/entitylistener-not-affecting-an-instance-in-a-nested-graph-in-a-standardeditor/12708/16

Developer automatically creates new entities in a UI component. To merge them to data context, we need access to data context from component.

It takes some time to find that you can get DataContext by screen with this method:

DataContext dataContext = UiControllerUtils.getScreenData(screenOrFrame).getDataContext();

// or from UI component
DataContext dataContext = UiControllerUtils.getScreenData(getFrame().getFrameOwner()).getDataContext();

I think it worth short mentioning on documentation page.