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Reference

 

Applies only to Web Applications
OutSystems

List Box Widget

Allows the user to select multiple values within a list of possible values.

The list of possible values is a List of Records where the Record definition must include a Boolean attribute to hold the user selection.

Properties

Name Description Mandatory Default value Observations
Name Identifies an element in the scope where it is defined, like a screen, action, or module. Yes
Validation Parent Specifies an Edit Record widget. Widgets with the same Validation Parent are validated as a group.
Source Record List Current list of records displayed by the widget. Yes
Source Attribute Specifies the attribute of the records in the list to populate the widget. Yes
Selection Mode Specifies if the user can select only a single item or multiple items from the list. Yes Multiple The possible values are: Multiple and Single.
Selection Attribute Boolean attribute of the records in the list that holds if a value is selected or not. If using a list from an Aggregate, you can add a new Boolean attribute in the Aggregate. Yes
Width Width of the widget in columns. Other accepted units are pixels(px), points(pt), or percentage(%). Overrides the style sheet definition.
Height Height of the widget in pixels. Other accepted units are points(pt) or percentage(%). Overrides the style sheet definition.
Margin Left Left margin of the widget in columns. Other accepted units are pixels(px), points(pt), or percentage(%). Overrides the style sheet definition.
Margin Top Top margin of the widget in pixels. Other accepted units are points(pt) or percentage(%). Overrides the style sheet definition.
Style Classes Specifies one or more style classes to apply to the widget. Separate multiple values with spaces.
Visible Boolean literal or expression that defines if the widget is displayed. Yes
Enabled Boolean literal or expression that defines if the widget is editable. Yes
Extended Properties
Property Name of an attribute to add to the HTML translation for this element. You can pick a property from the drop-down list or type a free text. The name of the property will not be validated by the platform.

Duplicated properties are not allowed. Spaces, " or ' are also not allowed.
Value Value of the attribute. You can type the value directly or write expressions using the Expression Editor.

If the Value is empty, the corresponding HTML tag is created as property="property". For example, the nowrap property does not require a value, therefore nowrap="nowrap" is added.
On Change
Destination Screen action to be executed or a screen to navigate to when the value of the element changes. It might be necessary to specify additional input arguments.

Runtime Properties

Name Description Read Only Type Observations
List Collection of records returned by the performed query. Record List
Valid Always True for List Boxes. You can override this property value when performing custom validation. Boolean
ValidationMessage Message describing the built-in validation constraints not satisfied when 'Valid' is False. You can override this property value when performing custom validations. Text
Id Identifies the widget instance at runtime (HTML 'id' attribute). You can use it in JavaScript and Extended Properties. Yes Text
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