|The top-level or global namespace is the
tableau namespace, which has no constructs, but contains the
extensions namespace. You use the tableau namespace to access the extensions. For example, you call
tableau.extensions.initializeAsync() to initialize the API.
extensions namespace is the namespace for Tableau extensions. A dashboard extension is one type of extension. A dashboard extension has access to the
dashboardContent namespace, and all of the objects and classes of the dashboard. Some namespaces, like the
ui are available to all extensions.
dashboardContent provides access to the dashboard object. When you have the dashboard object, you have access to all elements in the dashboard, including the worksheets, marks, filters, parameters, and data sources. For example, to access the worksheets in a dashboard (after initialization), you might have a line of code that looks like the following:
worksheets = tableau.extensions.dashboardContent.dashboard.worksheets
settings namespace provides methods to get and set values which will be persisted in a workbook. You can use the settings to configure an extension.
environment namespace provides methods to programmatically gather information about the environment in which the extension is running.
ui namespace provides methods for an extension to display a popup dialog window.
The following diagram shows the relationship between the extensions namespace and the worksheets in the dashboard. For more information, see Tableau Extensions API Basics.