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Data Sources
Introduction
Widgets that display information stored in entities require you to assign a method by which to retrieve the relevant data. Such methods are collectively known as data sources. Widgets that require a data source include all data widgets and input widgets. Pluggable widgets can also use data sources.
In this document, we describe data sources of data widgets.
Data View
A data view supports the following data sources:
- Context – the data view gets its object from the context: either from a page parameter or a surrounding data container
- Microflow – the data view object is determined by the result of calling the selected microflow. The microflow can take objects in the context as parameter and needs to return a single object.
- Nanoflow – objects retrieved are determined by the result of calling the selected nanoflow. The nanoflow can take objects in the context as a parameter and needs to return a single object.
- Listen to widget – the data view object depends on the selection in a list widget (a data grid, template grid, or list view)
List Widgets
A data grid, template grid, and list view are list widgets. Also some pluggable widgets may behave as list widgets and use data sources. Supported data sources are listed below:
- Database – objects are retrieved from the database; database constraints can be used to limit which objects are shown.
- XPath – objects are retrieved from the database; an XPath constraint can be used to constrain which objects are shown.
- Microflow – objects retrieved are determined by the result of calling the selected microflow. The microflow can take objects in the context as parameter and needs to return a list of objects.
- Nanoflow – objects retrieved are determined by the result of calling the selected nanoflow. The nanoflow can take objects in the context as a parameter and needs to return a list of objects. Nanoflow data source is only available for data views and list views.
- Association – the objects are retrieved from memory by following an association from the object in the context. So, this data source is only available when a widget is nested in another data container.
The data source also determines which features of the widget are enabled. For example, only widgets with a database or XPath data source can contain a search bar.