Expressions in Default Values

Default values may contain expressions.

When a default value contains an expression, note that expressions can also use other variables. You can reference a variable with the following syntax:

Scope	Variable Syntax
Application	$application.variables.<variableName>
Page	$page.variables.<variableName>
Action Chain	$chain.variables.<variableName>

Expressions must be wrapped in expression syntax :{{ expr }}. and the expression must be the entire value. Expressions can also call external functions via the page function module.

To reference another variable in a default value, you can do the following:

"nameOfVariable": {
  "type": "application:myType",
  "defaultValue":  {
    "foo": "{{ $application.variables.someOtherVariable }}"
  }
}

Since these are expressions, you can also add simple Javascript code to the values:

"myOtherVariable": {
  "type": {
    "someBoolProperty": "boolean"
  },
  "defaultValue": {
    "someBoolProperty": {{ $application.variables.someOtherVariable === true }}"
  }
}