UISelectMany

UISelectMany is a component found in JavaServer Faces (JSF) that allows users to select multiple items from a list. It is typically rendered as a set of checkboxes or a list box where multiple selections are permitted. The component is associated with a collection of data, often referred to as a list of choices or options, and a property on the managed bean that stores the selected items.

The primary purpose of UISelectMany is to provide a user interface for scenarios where a single selection is insufficient. Examples include selecting multiple hobbies, choosing multiple products to add to a cart, or assigning multiple roles to a user. The component handles the submission of multiple selected values back to the server and populates the corresponding property in the backing bean.

Key attributes of UISelectMany include the value attribute, which binds to the bean property holding the selected items, and the converter attribute, which specifies how the submitted string values are converted to the appropriate object type for the bean property. The items attribute is used to define the available options, typically referencing a collection of SelectItem objects. When rendering as checkboxes, the component generates individual checkbox elements for each item. For list boxes, it renders a select element with the multiple attribute set to true. Proper configuration of these attributes ensures correct data binding and user interaction.