(config-default-calls)= # Default Calls You can configure the DASF widget to make calls to the backend module right after the connection to the backend module has been established, without the need for user interaction. This is particularly useful if you want to populate the frontend with some initial content provided by the backend module. A standard use case would be to visualize the version of the DASF backend module. ## Example workflow An example workflow is demonstrated using the function {func}`dasf_exb:dasf_exb.backend.default_content` in our [demo project][demo project]. We use this to populate a data source `default_content` that is connected to one of ESRIs text widgets. Once the connection is establed, the frontend makes a call to the backend module with ```json { "func_name": "default_content" } ``` and the backend module returns content for the data source ```python def default_content() -> DataSource: return DataSource( name="default_content", records=[{"text": "Some default generated content by the backend."}], ) ``` This data source is listened by a `Text` widget in the experience builder . ## Configuration of default calls To create a default call, click the DASF widget and navigate in the settings sidebar to the section on _Default Calls_. Here you can now add and modify default calls. Click the `+`-button next to _Add new call_  and populate the text field with the JSON-formatted content you want to send  Optionally you can check the _Wait for map_ option to make sure, the call is sent after the map has been loaded (in case you want to show data on a map). [demo project]: https://hub.hereon.de/portal/apps/experiencebuilder/experience/?id=24e423be33fd496f8733a74b9e020c00