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----
-title: Tree
-order: 22
-layout: page
----
-
-[[components.tree]]
-= [classname]#Tree#
-
-The [classname]#Tree# component allows a natural way to represent data that has
-hierarchical relationships, such as filesystems or message threads. The
-[classname]#Tree# component in Vaadin works much like the tree components of
-most modern desktop user interface toolkits, for example in directory browsing.
-
-The typical use of the [classname]#Tree# component is for displaying a
-hierachical menu, like a menu on the left side of the screen, as in
-<<figure.components.tree>>, or for displaying filesystems or other hierarchical
-datasets. The [parameter]#menu# style makes the appearance of the tree more
-suitable for this purpose.
-
-
-[source, java]
-----
-final Object[][] planets = new Object[][]{
-        new Object[]{"Mercury"}, 
-        new Object[]{"Venus"},
-        new Object[]{"Earth", "The Moon"},    
-        new Object[]{"Mars", "Phobos", "Deimos"},
-        new Object[]{"Jupiter", "Io", "Europa", "Ganymedes",
-                                "Callisto"},
-        new Object[]{"Saturn",  "Titan", "Tethys", "Dione",
-                                "Rhea", "Iapetus"},
-        new Object[]{"Uranus",  "Miranda", "Ariel", "Umbriel",
-                                "Titania", "Oberon"},
-        new Object[]{"Neptune", "Triton", "Proteus", "Nereid",
-                                "Larissa"}};
-        
-Tree tree = new Tree("The Planets and Major Moons");
-
-/* Add planets as root items in the tree. */
-for (int i=0; i<planets.length; i++) {
-    String planet = (String) (planets[i][0]);
-    tree.addItem(planet);
-    
-    if (planets[i].length == 1) {
-        // The planet has no moons so make it a leaf.
-        tree.setChildrenAllowed(planet, false);
-    } else {
-        // Add children (moons) under the planets.
-        for (int j=1; j<planets[i].length; j++) {
-            String moon = (String) planets[i][j];
-            
-            // Add the item as a regular item.
-            tree.addItem(moon);
-            
-            // Set it to be a child.
-            tree.setParent(moon, planet);
-            
-            // Make the moons look like leaves.
-            tree.setChildrenAllowed(moon, false);
-        }
-
-        // Expand the subtree.
-        tree.expandItemsRecursively(planet);
-    }
-}
-
-main.addComponent(tree);
-----
-
-<<figure.components.tree>> below shows the tree from the code example in a
-practical situation.
-
-[[figure.components.tree]]
-.A [classname]#Tree# Component as a Menu
-image::img/tree-example1.png[]
-
-You can read or set the currently selected item by the value property of the
-[classname]#Tree# component, that is, with [methodname]#getValue()# and
-[methodname]#setValue()#. When the user clicks an item on a tree, the tree will
-receive an [classname]#ValueChangeEvent#, which you can catch with a
-[classname]#ValueChangeListener#. To receive the event immediately after the
-click, you need to set the tree as [classname]#setImmediate(true)#.
-
-The [classname]#Tree# component uses [classname]#Container# data sources much
-like the [classname]#Table# component, with the addition that it also utilizes
-hierarchy information maintained by a [classname]#HierarchicalContainer#. The
-contained items can be of any item type supported by the container. The default
-container and its [methodname]#addItem()# assume that the items are strings and
-the string value is used as the item ID.
-
-
-