arrow_back history picture_as_pdf This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong. ## Managing data in a screen For managing the data of a screen, the **CustomScreen** provides a simple API which can be accessed via **getDataApi('DATA_PROVIDER_NAME')** from anywhere in it's extended classes. This API provides the following functions: - dynamic **getValue**(String columnName) - Provides the value of a specific column - List **getValues**(List columnNames) - Provides a list of values for the specified columns - **setValue**(String columnName, dynamic value) - Sets the value for a specific column - **setValues**(List columnNames, List values) - Sets the values for a list of specified columns - **insertRecord**() - Inserts a new record - **deleteRecord**(int index) - Deletes the record at the specified index - **selectRecord**(int index) - Selects the record at the specified index The client persists those changes by itself. ## Examples Reading a value: DataApi dataApi = getDataApi('JVxMobileDemo/Con-CG/contacts#4'); FlatButton( child: Text("Call"), onPressed: () { phone = dataApi.getValue("PHONE"); launch("tel://$phone"); }) Setting a value: DataApi dataApi = getDataApi('JVxMobileDemo/Con-CG/contacts#4'); dynamic phoneNr = '+43660123456' FlatButton( child: Text("Set phone number"), onPressed: () { phone = dataApi.setValue("PHONE", phoneNr); }) Inserting a record: DataApi dataApi = getDataApi('JVxMobileDemo/Con-CG/contacts#4'); FlatButton( child: Text("Insert"), onPressed: () { phone = dataApi.insertRecord(); }) More examples can be found [here](https://github.com/sibvisions/flutterclient.example/blob/master/lib/screens/signature_custom_screen.dart) and [here](https://github.com/sibvisions/flutterclient.example/blob/master/lib/screens/contact_custom_screen.dart).