Conditional expressions can be used to compare or verify form data. For example, it is possible to check if a form field is null (empty or not filled in).

A conditional expression returns the True or False value for each case (comparison). If the result of a conditional expression is True, a certain action will be executed; otherwise, the action will not be executed. To execute another action when the conditional expression returns the False value, the Else option must be added.

A conditional expression may have two structures (IF-THEN-END or IF-THEN-ELSE-END):

While creating a rule, when the Add action button is clicked and the Create conditional expression option is selected, the system will display a screen for conditions to be created:

A - In the Value source field, select the source of the value that will be used in the conditional expression. Condition values may originate from form fields, variables, expressions, and functions already recorded in the form, or from fixed values. See further details about this field in the table below.

B - After selecting the source value, we must specify what the value will be; the options available for selection depend on the value source that has been selected. The Type and Value fields are shown at this spot when the value source is a Fixed value and they must be necessarily completed. Enter the fixed value type and its respective value that will be used in the conditional expression. See further details about this field in the table below.

C - The Operator field allows for defining the criterion to verify the expression. Depending on the selected Operator, we can check if a certain form field has been completed or not. It is also possible to compare two expressions by means of operators such as: equal to, different, null, not null, greater than, less than, greater than or equal to, less than or equal to, contains, and does not contain. When a comparison operator is selected, the fields of the second expression will be enabled immediately. See further details on this field in the Operator table.

D - This area shows the condition in writing. Thus, it is possible to check if the condition has been configured correctly. The condition may return two results: True or False. When the condition is true, the action assigned to it will be executed; otherwise, no actions will be executed, or the action assigned to Else will be executed.

E1 - Expression 1 - In this area, the first expression of the condition is defined. If the condition is only used to verify whether a value is null/false or not, a second expression does not need to be configured; however, if the conditional expression is comparing two values, the second expression of the condition must be defined.

E2 - Expression 2 - In this area, the second expression of the condition is defined. This area will be enabled when a comparison operator is selected (equal to, different from, greater than, less than, greater than or equal to, less than or equal to, contains and does not contain).

This option allows for changing the property of a form element (making it visible, enabling it, or making it required).

• Element: select the field that will have its properties changed. 
• Property: select the property.
• Value: set the value to be applied to the property.

In accordance with the set configurations, it will be possible to select an operation.

See further details on the configurations available for each property:

Use this action to edit the source of the value of a variable created in the form.

• Variable: select which of the variables will have its value changed.
• Value source: select the desired option, and then the option with the value to be applied to the variable.

Allows for clearing the value of a certain form field. To do so, select the desired form field.

Use this action to display a message on the form screen.

• Message: describe the message that will be displayed.
• Type: define whether the message type will be information, success, warning, or critical.

Use this action to execute another form rule.

• Rule: select the rule that will be executed.

Use this action to execute the URL on a new window or in the background.

Use this action to execute, in the specified table, an operation of the "Sum", "Maximum", "Minimum", "Counter", or "Concatenate" type.

Use this action to translate a PDF file added to a form field.

• Table field: specify the field in which the PDF file to be translated will be inserted. 
• Language: choose into which language the file will be translated.
• Target field: specify in which field the translated file will be saved.

Use this action to assign the result of a dataset to a form table variable.

For example, in a dataset that returns a user's code and name, the code can be assigned to a variable, whereas the name is assigned to another variable.

Use this action to automatically execute a dataset when loading a responsive form; the grid will be filled out with the necessary information, without manual interaction on the user's part.

Specify which Form field, of the Table type, will have its data source executed automatically.

Use this action to execute a REST web service in a form button or any object that has events for rule execution. 

Thus, it is possible, for example, to fetch data from third-party systems through REST web services and fill in the form fields with the returned data. 

The system also allows for sending data when invoking the service, but with a restriction when sending electronic files and multiple values to the same parameter.

This action allows for using a smartphone camera to fill in a form field by reading a barcode.

Use this action to insert a comment in the instance history using a value entered in the form itself.

• Value source: indicate whether the comment content will be taken from a form field, a fixed value, a variable, an expression, or a rule.

Use this action to edit the process instance status.

• Status: select the desired status and click on the Save and close button.

Use this action to edit the instance priority. To do that, select a new evaluation method and a result for the method.

Use this action to execute tasks using a button of the form that is related to the activity that loaded the form. These actions require the rule to be executed in the interface.

This action allows for interrupting the execution of an activity after the corresponding action button is clicked. This provides users with a greater flexibility to perform the necessary validations and adjustments before moving on.