React FileManager - Custom.Configuration
hasSubDirectoriesExpr
A function or the name of a data source field that provides information on whether a file or folder contains sub directories.
thumbnailExpr
The data field can contain one of the following:
- The icon's URL
- The icon's name if the icon is from the DevExtreme icon library
- The icon's CSS class if the icon is from an external icon library (see External Icon Libraries)
- The icon in the Base64 format
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