The DefaultDataSource Placeholder

Each page has a default data source. This is the data source object that has its Default Data Source property set to Yes.

The DefaultDataSource placeholder refers to the current page's default data source:

${DefaultDataSource}

This placeholder allows you to re-use controls and routines in multiple pages without the need to hard-code a different data source name each time.

Example

In the Controls catalog, you will find a DeleteButtonControl for which the onclick action has the following settings:

Action Name: DeleteRecord

Data Source Name: ${DefaultDataSource}

These settings are equivalent to the following code snippet:

DeleteRecord(${DefaultDataSource}

At runtime, when the button is pressed, the ${DefaultDataSource} placeholder is substituted by the name of the data source in the page that has Default Data Source = Yes. The result is that the current record is deleted from the recordset that maps to that data source.

NOTE: Constructs with ${DefaultDataSource} are becoming obsolete. For example, DeleteRecord(${DefaultDataSouce}) is replaced by constructs using .rowDelete().