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Metadata Wizard Expression

Expressions are used to dynamically provide values to Wizard Components. Components can accept expressions in some of their metadata properties in order to be able to have dynamic behavior. With expressions, you can access other Wizard Components instance values in order to dynamically set the metadata attributes and create conditions. When a Wizard Component has an expression as any of their metadata attributes, the Wizard Component is re-rendered every time the expression value changes.

Literal Value

Any expression that doesn’t match the structure of the other expression types, is considered a literal

Example
1"{! !(promoTemplate.Name == 'Test' || promoTemplate.Name != 'Test2') }"
2...
Properties of identifiers can be accessed using dot notation:
1"{! promoTemplate.Name }"
Literal Example Resolves to
true "{! true }" Boolean true
false "{! false }" Boolean false
null "{! null }" null

String Expressions

A string with a specific start and end sequence of characters ("{!" and "}"). These expressions are used to retrieve values from other Wizard Component instances. In order to reference another Wizard Component instance, you must specify the component ID.

Example
1...
2{
3    "id": "myCheckboxField",
4    "type": "Checkbox",
5},
6...
7{
8    "id": "myOtherField",
9    "active": "{! myCheckboxField }",
10...

Logical Expressions

An object with 3 properties- left, right and operator. This type of expression is used to perform operations between different values.

Example
1{
2    "left": <expression>
3    "operator": "equal",
4    "right" : <expression>
5}
6  
7// Example
8...
9"active" : {
10    "left": "{! myCheckbox}",
11    "operator":"equal",
12    "right": true
13},
14...
List of the available operators:
  • and
  • or
  • equal
  • notEqual
  • greaterThan
  • lessThan
  • greaterThanOrEqual
  • lessThanOrEqual
  • sum
  • subtract
  • multiply
  • divide

Expression Variables

Additional values can also be referenced from expressions:

  • _input_ → The input payload passed to the Wizard instance during its creation. Can be used to set default values:
    • "{! _input_.Slogan }"