Selecting the Target Parameter

This article explains how the parameter dialog works, which parameters are shown, and how to select the right parameter.

Opening the Parameter Dialog

Click the button in the Target Parameter cell of the rule table. The tool automatically performs:

Filtering the element set by data source, geometry filter, and category (evaluation).
Collecting all writable parameters from the found elements.
Opening the parameter dialog with the full parameter list.

Target Parameter

Note: If no elements are found in step 1, an error message appears instead of the dialog. Check data source, geometry filter, and category.

Which Parameters Are Shown?

The parameter dialog shows all parameters that are present on the found elements and are writable. The following are excluded:

Read-only parameters (e.g. calculated areas, IDs)
Parameters of type ElementId

Standard Parameters (always available)

When no category is selected, the tool loads all project parameters from the model. In addition, these Revit built-in parameters are always offered:

Parameter Mode	Standard Parameters
Instance	Comments, Mark
Type	Keynote, Description, Manufacturer, Cost, Model, Type Comments, Type Mark, URL

Navigating the Parameter Dialog

Action	Result
Double-click a parameter	Select parameter and close dialog
Select row + OK button	Select parameter
Search field	Filter list by parameter name
Instance/Type column	Shows whether the parameter is an instance or type parameter

Tip: The parameter list can be sorted by clicking column headers. Sorting by Instance/Type separates instance and type parameters clearly.

Value Types – Effect on Input

After selecting a parameter, the tool automatically detects the value type (Text, Integer, Double, Yes/No). If you later replace the target parameter with one of a different type, the entered value is automatically cleared.

Value Type	Revit StorageType	Allowed Inputs
Text	String	Any string, including empty. Supports Pattern Parser expressions.
Integer	Integer (non Yes/No)	Whole number or Pattern Parser expression returning an integer
Double	Double	Decimal number (period or comma separator). Units converted automatically.
Yes/No	Integer (YesNo type)	`Yes` / `No` (localized) or `1` / `0`, or Pattern Parser expression

Entering a Fixed Value

Click directly in the Value cell of the rule table and type the desired value. Use the clear button (X) next to the value field to clear the current value.

Reserved word: The text <No Value> is internally reserved and cannot be set as a text value.