Expression Editor

The expression editor uses functions to build expressions that perform a variety of calculations and operations.

The following tools have an expression editor: Action Tool, Charting Tool, Condition Tool, Dynamic Rename Tool, Error Message Tool, Filter Tool, Generate Rows Tool, Message Tool, Multi-Field Formula Tool, Multi-Row Formula Tool, Report Map Tool, Table Tool, Test Tool. Tools that use an expression editor have an additional input anchor, the Question anchor, when the tool is used in an app or macro workflow. Use the Interface tools to connect to a Question anchor when you want question values to be used as variables in the expression. See Interface Tools.

The expression editor in the Formula Tool looks and behaves differently than the expression editor in other tools, but the functions perform the same in any tool.

As you edit the expression, the editor applies a color coding scheme to the parts of the expression. Functions are gold; variables are fuschia, and strings are green. In this way, the parts of the expression are easy to distinguish.

Build an expression

Use any of these methods to build an expression:

• Type directly in the expression editor.
• Click Variables to browse through variables that can be used in the expression. Double-click the variable to add it to the expression editor.
Variables
• Fields: Data from an incoming connection, or from a column created in a previous expression.
• Connections from Questions: Values from an Interface tool connected to the Question anchor of a tool with an expression editor, when the tool is used in an app or macro. Use the Question anchor when you want question values to be used as variables in the expression. See Interface Tools.
• Constants: Global variables for a workflow that make it possible to change a value in a single location and have that change apply to the rest of the workflow. See Constants.
• Click Functions to browse through categories of functions. Double-click the function to add it to the expression editor. See Functions.
• Click Saved Expressions to browse through recent and saved expressions. Double-click the expression to add it to the expression editor.
Save an expression
• With an expression in the expression editor, click Save.
• Type a name for the expression and click OK.