drillMember
Does not apply to Selection Lists.
Returns the name of the field one level below the deepest level in the hierarchy at which the user has made a selection. For example, consider a three-level Selection Tree hierarchy: 'Region' > 'State' > 'City'.

If the user's most specific selection is at the level of region, then drillMember returns 'State'. If the user's most specific selection is at the level of state, then drillMember returns 'City'. If the user's most specific selection is at the level of city, then because there is no lower level drillMember again returns 'City'. If the user has not selected any values in the Selection Tree, then drillMember returns the highest level, here 'Region'.
Type
String field name for child of deepest selected level
Example
var drillField = SelectionTree1.drillMember;
This property is very useful for creating interactive chart drilldowns.
See Also
Walkthrough: Interactive Chart Drilldown, for an example usage.
Selection List Properties and Selection Tree Properties, for more information.
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