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----
-title: Selection Components
-order: 5
-layout: page
----
-
-[[components.selection]]
-= Selection Components
-
-Vaadin offers many alternative ways for selecting one or more items. The core
-library includes the following selection components, all based on the
-[classname]#AbstractSelect# class:
-
-[classname]#ComboBox# (Section <<dummy/../../../framework/components/components-combobox#components.combobox,"ComboBox">>):: A drop-down list with a text box, where the user can type text to find matching items. The component also provides an input prompt and the user can enter new items.
-[classname]#ListSelect# (Section <<dummy/../../../framework/components/components-listselect#components.listselect,"ListSelect">>):: A vertical list box for selecting items in either single or multiple selection mode.
-[classname]#NativeSelect# (Section<<dummy/../../../framework/components/components-nativeselect#components.nativeselect,"NativeSelect">>):: Provides selection using the native selection component of the browser, typically a drop-down list for single selection and a multi-line list in multiselect mode. This uses the [literal]#++<select>++# element in HTML.
-[classname]#OptionGroup# (Section <<dummy/../../../framework/components/components-optiongroup#components.optiongroup,"OptionGroup">>):: Shows the items as a vertically arranged group of radio buttons in the single selection mode and of check boxes in multiple selection mode.
-[classname]#TwinColSelect# (Section <<dummy/../../../framework/components/components-twincolselect#components.twincolselect,"TwinColSelect">>):: Shows two list boxes side by side where the user can select items from a list of available items and move them to a list of selected items using control buttons.
-
-
-In addition, the [classname]#Tree#, [classname]#Table#, and
-[classname]#TreeTable# components allow special forms of selection. They also
-inherit the [classname]#AbstractSelect#.
-
-[[components.selection.databinding]]
-== Binding Selection Components to Data
-
-The selection components are strongly coupled with the Vaadin Data Model,
-described in
-<<dummy/../../../framework/datamodel/datamodel-overview.asciidoc#datamodel.overview,"Binding
-Components to Data">>. The selectable items in all selection components are
-objects that implement the [classname]#Item# interface. The items are contained
-in a [classname]#Container#.
-
-All selection components are containers themselves and simply forward all
-container operations to the underlying container data source. You can give the
-container in the constructor or set it set
-[methodname]#setContainerDataSource()#. This is further described in
-<<dummy/../../../framework/datamodel/datamodel-container#datamodel.container.intro,"Basic
-Use of Containers">>.
-
-
-[source, java]
-----
-// Have a container data source of some kind
-IndexedContainer container = new IndexedContainer();
-container.addContainerProperty("name", String.class, null);
-...
-
-// Create a selection component bound to the container
-OptionGroup group = new OptionGroup("My Select", container);
-----
-
-If you do not bind a selection component to a container data source, a default
-container is used. It is usually either an [classname]#IndexedContainer# or a
-[classname]#HierarchicalContainer#.
-
-The current selection of a selection component is bound to the
-[classname]#Property# interface, so you can get the current selection as the
-value of the selection component. Also selection changes are handled as value
-change events, as is described later.
-
-
-[[components.selection.adding]]
-== Adding New Items
-
-New items are added with the [methodname]#addItem()# method defined in the
-[classname]#Container# interface, described in
-<<dummy/../../../framework/datamodel/datamodel-container#datamodel.container.intro,"Basic
-Use of Containers">>.
-
-
-[source, java]
-----
-// Create a selection component
-ComboBox select = new ComboBox("My ComboBox");
-
-// Add items with given item IDs
-select.addItem("Mercury");
-select.addItem("Venus");
-select.addItem("Earth");
-----
-
-The [methodname]#addItem()# method creates an empty [classname]#Item#, which is
-identified by its __item identifier__ (IID) object, given as the parameter. This
-item ID is by default used also as the caption of the item, as described in more
-detail later.
-
-We emphasize that [methodname]#addItem()# is a factory method that __takes an
-item ID, not the actual item__ as the parameter - the item is returned by the
-method. The item is of a type that is specific to the container and has itself
-little relevance for most selection components, as the properties of an item may
-not be used in any way (except in [classname]#Table#), only the item ID.
-
-The item identifier is typically a string, in which case it can be used as the
-caption, but can be any object type. We could as well have given integers for
-the item identifiers and set the captions explicitly with
-[methodname]#setItemCaption()#. You could also add an item with the
-parameterless [methodname]#addItem()#, which returns an automatically generated
-item ID.
-
-
-[source, java]
-----
-// Create a selection component
-ComboBox select = new ComboBox("My Select");
-
-// Add an item with a generated ID
-Object itemId = select.addItem();
-select.setItemCaption(itemId, "The Sun");
-
-// Select the item
-select.setValue(itemId);
-----
-
-Some container types may support passing the actual data object to the add
-method. For example, you can add items to a [classname]#BeanItemContainer# with
-[methodname]#addBean()#. Such implementations can use a separate item ID object,
-or the data object itself as the item ID, as is done in [methodname]#addBean()#.
-In the latter case you can not depend on the default way of acquiring the item
-caption; see the description of the different caption modes later.
-
-The next section describes the different options for determining the item
-captions.
-
-
-[[components.selection.captions]]
-== Item Captions
-
-The displayed captions of items in a selection component can be set explicitly
-with [methodname]#setItemCaption()# or determined from the item IDs or item
-properties. The caption determination is defined with the __caption mode__, any
-of the modes in the [classname]#AbstractSelect.ItemCaptionMode# enum, which you
-can set with [methodname]#setItemCaptionMode()#. The default mode is
-[parameter]#EXPLICIT_DEFAULTS_ID#, which uses the item identifiers for the
-captions, unless given explicitly.
-
-In addition to a caption, an item can have an icon. The icon is set with
-[methodname]#setItemIcon()#.
-
-The caption modes defined in [classname]#ItemCaptionMode# are the following:
-
-EXPLICIT_DEFAULTS_ID:: This is the default caption mode and its flexibility allows using it in most
-cases. By default, the item identifier will be used as the caption. The
-identifier object does not necessarily have to be a string; the caption is
-retrieved with [methodname]#toString()# method. If the caption is specified
-explicitly with [methodname]#setItemCaption()#, it overrides the item
-identifier.
-
-
-+
-[source, java]
-----
-// Create a selection component
-ComboBox select = new ComboBox("Moons of Mars");
-select.setItemCaptionMode(ItemCaptionMode.EXPLICIT_DEFAULTS_ID);
-
-// Use the item ID also as the caption of this item
-select.addItem(new Integer(1));
-
-// Set item caption for this item explicitly
-select.addItem(2); // same as "new Integer(2)"
-select.setItemCaption(2, "Deimos");
-----
-EXPLICIT:: Captions must be explicitly specified with [methodname]#setItemCaption()#. If
-they are not, the caption will be empty. Such items with empty captions will
-nevertheless be displayed in the selection component as empty items. If they
-have an icon, they will be visible.
-
-ICON_ONLY:: Only icons are shown, captions are hidden.
-
-ID:: String representation of the item identifier object is used as caption. This is
-useful when the identifier is a string, and also when the identifier is an
-complex object that has a string representation. For example:
-
-
-+
-[source, java]
-----
-ComboBox select = new ComboBox("Inner Planets");
-select.setItemCaptionMode(ItemCaptionMode.ID);
-
-// A class that implements toString()
-class PlanetId extends Object implements Serializable {
-    String planetName;
-
-    PlanetId (String name) {
-        planetName = name;
-    }
-    public String toString () {
-        return "The Planet " + planetName;
-    }
-}
-
-// Use such objects as item identifiers
-String planets[] = {"Mercury", "Venus", "Earth", "Mars"};
-for (int i=0; i<planets.length; i++)
-    select.addItem(new PlanetId(planets[i]));
-----
-INDEX:: Index number of item is used as caption. This caption mode is applicable only to
-data sources that implement the [classname]#Container.Indexed# interface. If the
-interface is not available, the component will throw a
-[classname]#ClassCastException#. The [classname]#AbstractSelect# itself does not
-implement this interface, so the mode is not usable without a separate data
-source. An [classname]#IndexedContainer#, for example, would work.
-
-ITEM:: [classname]#String# representation of item, acquired with
-[methodname]#toString()#, is used as the caption. This is applicable mainly when
-using a custom [classname]#Item# class, which also requires using a custom
-[classname]#Container# that is used as a data source for the selection
-component.
-
-PROPERTY:: Item captions are read from the [classname]#String# representation of the
-property with the identifier specified with
-[methodname]#setItemCaptionPropertyId()#. This is useful, for example, when you
-have a container that you use as the data source for the selection component,
-and you want to use a specific property for caption.
-
-+
-In the example below, we bind a selection component to a bean container and use
-a property of the bean as the caption.
-
-
-+
-[source, java]
-----
-/** A bean with a "name" property. */
-public class Planet implements Serializable {
-    int    id;
-    String name;
-    
-    public Planet(int id, String name) {
-        this.id   = id;
-        this.name = name;
-    }
-
-    ... setters and getters ...    
-}
-
-public void captionproperty(VerticalLayout layout) {
-    // Have a bean container to put the beans in
-    BeanItemContainer<Planet> container =
-        new BeanItemContainer<Planet>(Planet.class);
-
-    // Put some example data in it
-    container.addItem(new Planet(1, "Mercury"));
-    container.addItem(new Planet(2, "Venus"));
-    container.addItem(new Planet(3, "Earth"));
-    container.addItem(new Planet(4, "Mars"));
-
-    // Create a selection component bound to the container
-    ComboBox select = new ComboBox("Planets", container);
-
-    // Set the caption mode to read the caption directly
-    // from the 'name' property of the bean
-    select.setItemCaptionMode(ItemCaptionMode.PROPERTY);
-    select.setItemCaptionPropertyId("name");
-
-    ...
-----
-
-
-
-[[components.selection.getset]]
-== Getting and Setting Selection
-
-A selection component provides the current selection as the property of the
-component (with the [classname]#Property# interface). The property value is an
-item identifier object that identifies the selected item. You can get the
-identifier with [methodname]#getValue()# of the [classname]#Property# interface.
-
-You can select an item with the corresponding [methodname]#setValue()# method.
-In multiselect mode, the property will be an unmodifiable set of item
-identifiers. If no item is selected, the property will be [parameter]#null# in
-single selection mode or an empty collection in multiselect mode.
-
-The [classname]#ComboBox# and [classname]#NativeSelect# will show empty
-selection when no actual item is selected. This is the __null selection item
-identifier__. You can set an alternative ID with
-[methodname]#setNullSelectionItemId()#. Setting the alternative null ID is
-merely a visual text; the [methodname]#getValue()# will still return
-[parameter]#null# value if no item is selected, or an empty set in multiselect
-mode.
-
-
-[[components.selection.valuechange]]
-== Handling Selection Changes
-
-The item identifier of the currently selected item will be set as the property
-of the selection component. You can access it with the [methodname]#getValue()#
-method of the [classname]#Property# interface of the component. Also, when
-handling selection changes with a [classname]#Property.ValueChangeListener#, the
-[classname]#ValueChangeEvent# will have the selected item as the property of the
-event, accessible with the [methodname]#getProperty()# method.
-
-
-[source, java]
-----
-// Create a selection component with some items
-ComboBox select = new ComboBox("My Select");
-select.addItems("Io", "Europa", "Ganymedes", "Callisto");
-        
-// Handle selection change
-select.addValueChangeListener(event -> // Java 8
-    layout.addComponent(new Label("Selected " +
-        event.getProperty().getValue())));
-----
-
-The result of user interaction is shown in
-<<figure.components.selection.valuechange>>.
-
-[[figure.components.selection.valuechange]]
-.Selected Item
-image::img/select-selected1.png[]
-
-
-[[components.selection.newitems]]
-== Allowing Adding New Items
-
-Some selection components can allow the user to add new items. Currently, only
-[classname]#ComboBox# allows it, when the user types in a value and presses
-Enter. You need to enable the mode with [methodname]#setNewItemsAllowed(true)#.
-Setting the component also in immediate mode may be necessary, as otherwise the
-item would not be added immediately when the user interacts with the component,
-but after some other component causes a server
-request.////
-TODO This could be a
-bug
-////
-
-
-[source, java]
-----
-myselect.setNewItemsAllowed(true);
-myselect.setImmediate(true);
-----
-
-The user interface for adding new items depends on the selection component. The
-regular [classname]#ComboBox# component allows you to simply type the new item
-in the combo box and hit Enter to add it.
-
-Adding new items is not possible if the selection component is read-only or is
-bound to a [classname]#Container# that does not allow adding new items. An
-attempt to do so may result in an exception.
-
-[[components.selection.newitems.handling]]
-=== Handling New Items
-
-Adding new items is handled by a [interfacename]#NewItemHandler#, which gets the
-item caption string as parameter for the [methodname]#addNewItem()# method. The
-default implementation, [classname]#DefaultNewItemHandler#, checks for read-only
-state, adds the item using the entered caption as the item ID, and if the
-selection component gets the captions from a property, copies the caption to
-that property. It also selects the item. The default implementation may not be
-suitable for all container types, in which case you need to define a custom
-handler. For example, a [classname]#BeanItemContainer# expects the items to have
-the bean object itself as the ID, not a string.
-
-ifdef::web[]
-
-[source, java]
-----
-// Have a bean container to put the beans in
-final BeanItemContainer<Planet> container =
-    new BeanItemContainer<Planet>(Planet.class);
-
-// Put some example data in it
-container.addItem(new Planet(1, "Mercury"));
-container.addItem(new Planet(2, "Venus"));
-container.addItem(new Planet(3, "Earth"));
-container.addItem(new Planet(4, "Mars"));
-
-final ComboBox select =
-    new ComboBox("Select or Add a Planet", container);
-select.setNullSelectionAllowed(false);
-        
-// Use the name property for item captions
-select.setItemCaptionPropertyId("name");
-        
-// Allow adding new items
-select.setNewItemsAllowed(true);
-select.setImmediate(true);
-
-// Custom handling for new items
-select.setNewItemHandler(new NewItemHandler() {
-    @Override
-    public void addNewItem(String newItemCaption) {
-        // Create a new bean - can't set all properties
-        Planet newPlanet = new Planet(0, newItemCaption);
-        container.addBean(newPlanet);
-        
-        // Remember to set the selection to the new item
-        select.select(newPlanet);
-        
-        Notification.show("Added new planet called " +
-                          newItemCaption);
-    }
-});
-----
-See the http://demo.vaadin.com/book-examples-vaadin7/book#component.select.combobox.newitemhandler[on-line example, window="_blank"].
-endif::web[]
-
-
-
-[[components.selection.multiple]]
-== Multiple Selection
-
-Some selection components, such as [classname]#OptionGroup# and
-[classname]#ListSelect# support a multiple selection mode, which you can enable
-with [methodname]#setMultiSelect()#. For [classname]#TwinColSelect#, which is
-especially intended for multiple selection, it is enabled by default.
-
-
-[source, java]
-----
-myselect.setMultiSelect(true);
-----
-
-As in single selection mode, the property value of the component indicates the
-selection. In multiple selection mode, however, the property value is a
-[classname]#Collection# of the item IDs of the currently selected items. You can
-get and set the property with the [methodname]#getValue()# and
-[methodname]#setValue()# methods as usual.
-
-A change in the selection will trigger a [classname]#ValueChangeEvent#, which
-you can handle with a [classname]#Propery.ValueChangeListener#. As usual, you
-should use [methodname]#setImmediate(true)# to trigger the event immediately
-when the user changes the selection. The following example shows how to handle
-selection changes with a listener.
-
-
-[source, java]
-----
-// A selection component with some items
-ListSelect select = new ListSelect("My Selection");
-select.addItems("Mercury", "Venus", "Earth",
-    "Mars", "Jupiter", "Saturn", "Uranus", "Neptune");
-
-// Multiple selection mode
-select.setMultiSelect(true);
-
-// Feedback on value changes
-select.addValueChangeListener(
-    new Property.ValueChangeListener() {
-    public void valueChange(ValueChangeEvent event) {
-        // Some feedback
-        layout.addComponent(new Label("Selected: " +
-            event.getProperty().getValue().toString()));
-    }
-});
-select.setImmediate(true);
-----
-
-
-[[components.selection.item-icons]]
-== Item Icons
-
-You can set an icon for each item with [methodname]#setItemIcon()#, or define an
-item property that provides the icon resource with
-[methodname]#setItemIconPropertyId()#, in a fashion similar to captions. Notice,
-however, that icons are not supported in [classname]#NativeSelect#,
-[classname]#TwinColSelect#, and some other selection components and modes. This
-is because HTML does not support images inside the native [literal]#++select++#
-elements. Icons are also not really visually applicable.
-
-
-
-