Elements can have default values and/or options to select from. These can be specified in the Attributes panel as described on the documentation pages of the respective form element (see Prepopulation for each supported form element).
There may be cases, however, where values of form elements need to be set dynamically at service runtime. Doing this is possible for all form elements.

Select Field Example

The following example shows how to set options to a select field.

UseLib_CustomerData_Example

Click the icon to download a simple example model that uses the CustomerAddress_Lib library.

Building the Data Model Structure for a Select Field

The mentioned UseLib_CustomerAddress_Example contains the following form Form_SelectCustomer:

To be able to set a list of values to a select field, you need to build a certain structure in your data model in the Implementation folder. This structure is based on PAS data types that are provided with the Base Types.
Wanting to prepopulate the customer select field select_Customer with custom data dynamically, you need to prepare the the following structure in your data model:

Elements marked in orange need to be created, elements marked in red must have a name that conforms to certain rules.

In the example service, a select field select_Customer on form SelectCustomer is populated from an array of customers.
For creating the needed structure, proceed as follows:

Setting the Options for a Select Field

To actually set the options, you need to implement the init_... operation. The example operation init_select_Customer is implemented with a mapping diagram.

Using a foreach loop, values from the customers array are set to the options array of the select field. You can use the select field itself (select_Customer) to initialize the default selection of the select field.