Limiting link updates
When a gadget is linked to multiple data selection gadgets, each choice updates the gadget. This situation can occur due to automatic linking of gadgets using the same BIRT data object.
For example, consider a chart gadget links to the following two data selection gadgets; a list gadget displaying countries and a list gadget displaying states. If the user selects a city, then the country list updates to show the country containing the city and the chart gadget updates to displays data about the city. If the user selects a country, then the city list updates to show cities in the country and the chart gadget displays data about the country.
If the dashboard designer wants to update the chart only when the user selects a city, the automatic links must be removed and replaced by two links:
Figure 6-4 shows cascading user selections displaying values to the user. When the user selects a country, only the list gadget displaying cities is updated. When the user selects a city, the chart gadget is updated.
