# Expression Editor

At times you may require complex expressions to create the property values of controls or actions. The Expression Editor is an easy-to-use tool to help you formulate expressions.

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### How to use the Expression Editor

Click on the Expression Editor icon ![](data:image/png;base64,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) that is associated with the relevant property.

The editor consists of 3 panels:

1. *Expression*\
   Formulate your expression here, by either typing it or adding available variables and code snippets from the panel on the right.
2. *Errors*
3. On the right, a panel with 2 tabs:
   * *Values*
     * Session variables
     * Script variables
     * Control elements
   * *Code Snippets*\
     Code that deal with various aspects of the following can be added to your expression:

     * Data Types
     * Dates
     * Arrays
     * Strings

     \
     \&#xNAN;*System variables* can be accessed with code snippets and by using JavaScript, e.g. current date and time.\
     Click on a code snippet in the Expression Editor to view help info in the bottom-right corner.\
     To include a variable or code snippet in your expression, either *drag-and-drop* it onto the expression panel, or *double-click* on it.

     For more help on JavaScript, go [here](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference).

![](/files/BnQu54vvSsfiSSaddd0y)

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