Single Selection

The DropDownBox component consists of a text field and drop-down content. In this demo, the content is the TreeView and the DataGrid in single selection mode.

The following instructions show how to synchronize the DropDownBox with an embedded DevExtreme component:

1. Specify data sources
   The DropDownBox and its embedded component can use the same or different data sources. If the data sources are different, you need to specify the embedded component's key field in the DropDownBox's data source. If the DropDownBox contains a DataGrid, bind the DataGrid to a store instead of a simple array (for example, an ArrayStore).

2. Specify which data field contains the DropDownBox's values and the embedded component's keys
   Assign the field's name to the DropDownBox's valueExpr property and to the key property of the embedded component's store.

3. Synchronize the DropDownBox's value and the embedded component's selection

   1. Assign DropDownBox's initial value to the embedded component's selectedRowKeys/selectedItemKeys property (see the example with the DataGrid below). If the embedded component does not have such properties, implement the onContentReady handler (the example with the TreeView).
   2. Implement the DropDownBox's onValueChanged handler to update the selection when the value changes.
   3. Implement the embedded component's onSelectionChanged handler to update the DropDownBox's value when the selection changes.