Set Variable

The Set Variable Action is used to change the value of a Variable based on the value of any other Variable or Airscript expression. It has many uses, including setting the validation state of a form to TRUE or FALSE based on user input, or combining two different values from a form.



Use Cases

  • To track whether a user's entry is valid and modify the UI appropriately, as seen in Validation of Forms & User Data.
  • To dynamically change a Variable that is used as the text value of a Label.
  • To consolidate data to be used in a Data Flow. For instance, if the user enters their email in one Web Flow, the Set Variable Action can be used to save it to the session, with session.user_email = activity.user_email.
    • If the user later opens a new Web Flow to escalate their case, the session.user_email Variable can then be passed into a Data Flow to create a Zendesk Ticket populated with the user's information.
  • To bind two controls together. For instance, a Map component and a Place Search Input component could be bound together.
    • When the user scrolls the Map, the Place Search Input updates to the new address under the marker.
    • When the user types an address into the Place Search Input, the Map scrolls to center on the new address.



The Variable whose value will be changed by this action. To create a variable see Variable Tree.


The new value for the specified Variable. The value can be any Airscript expression, including the original Variable itself, or any Airscript function that returns the same type as the Variable.


In the example below, email_is_valid will be set to TRUE if the email_input Variable contains a valid email, or FALSE if it does not.