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## 6.90. < rich:tree >

### 6.90.1. Description

The component is designed for hierarchical data presentation and is applied for building a tree structure with a drag-and-drop capability.

Figure 6.293. Expanded <rich:tree> with child elements

### 6.90.2. Key Features

- Highly customizable look-and-feel

- Built-in drag and drop capability, than enable relocating tree nodes within the tree

- Built-in Ajax processing

- Possibility to define a visual representation by node type

- Support of several root elements in a tree

Table 6.487. rich : tree attributes

Attribute Name | Description
--- | ---
acceptCursors | List of comma separated cursors that indicates when acceptable draggable over dropzone
acceptedTypes | A list of drag zones types, which elements are accepted by a drop zone
adviseNodeOpened | MethodBinding pointing at a method accepting an org.richfaces.component.UITree with return of java.lang.Boolean type. If returned value is: java.lang.Boolean. TRUE, a particular treeNode is expanded; java.lang.Boolean.FALSE, a particular treeNode is collapsed; null, a particular treeNode saves the current state
adviseNodeSelected | MethodBinding pointing at a method accepting an org.richfaces.component.UITree with return of java.lang.Boolean type. If returned value is: java.lang.Boolean. TRUE, a particular treeNode is selected; java.lang.Boolean.FALSE, a particular treeNode is unselected; null, a particular treeNode saves the current state
ajaxSingle | boolean attribute which provides possibility to limit JSF tree processing(decoding, conversion/validation, value applying) to the component which send the request only
ajaxSubmitSelection | If "true", an Ajax request to be submit when selecting node. Default value is "false".
binding | The attribute takes a value-binding expression for a component property of a backing bean
bypassUpdates | If "true", after process validations phase it skips updates of model beans on a force render response. It can be used for validating components input
changeExpandListener | Listener called on expand/collapse event on the node
componentState | It defines EL-binding for a component state for saving or redefinition
cursorTypeMapping | Mapping between drop types and acceptable cursors
data | Serialized (on default with JSON) data passed on the client by a developer on AJAX request. It's accessible via "data.foo" syntax
dragIndicator | Id of a component that is used as drag pointer during the drag operation
dragListener | MethodBinding representing an action listener method that will be notified after drag operation
dragType | A drag zone type that is used for zone definition, which elements can be accepted by a drop zone
dragValue | Data to be sent to the drop zone after a drop event. Default value is "getRowKey()".
dropListener | MethodBinding representing an action listener method that will be notified after drop operation
dropValue | Data to be processed after a drop event. Default value is "getRowKey()".
eventsQueue | Name of requests queue to avoid send next request before complete other from same event. Can be used to reduce number of requests of frequently events (key press, mouse move etc.)
focus | id of element to set focus after request completed on client side
grabbingCursors | List of comma separated cursors that indicates when you has grabbed something
grabCursors | List of comma separated cursors that indicates when you can grab and drag an object
highlightedClass | Corresponds to the HTML class attribute. Applied to highlighted node
icon | The icon for node
iconCollapsed | The icon for collapsed node
iconExpanded | The icon for expanded node
iconLeaf | An icon for component leaves
id | Every component may have a unique id that is automatically created if omitted
ignoreDupResponses | Attribute allows to ignore an Ajax Response produced by a request if the newest 'similar' request is in a queue already. ignoreDupResponses="true" does not cancel the request while it is processed on the server, but just allows to avoid unnecessary updates on the client side if the response isn't actual now
immediate | A flag indicating that this component value must be converted and validated immediately (during an Apply Request Values phase), rather than waiting until a Process Validations phase
limitToList | If "true", updates on client side ONLY elements from this 'reRender' property. If "false" (default) updates all rendered by ajax region components
nodeFace | Node face facet name
nodeSelectListener | MethodBinding representing an action listener method that will be notified after selection of node.
onbeforedomupdate | JavaScript code for call before DOM has been updated on client side
onclick | HTML: a script expression; a pointer button is clicked
oncollapse | HTML: script expression to invoke on node collapsing
oncomplete | JavaScript code for call after request completed on client side
ondblclick | HTML: a script expression; a pointer button is double-clicked
ondragend | A JavaScript event handler called after a drag operation
ondragenter | A JavaScript event handler called on enter draggable object to zone
ondragexit | A JavaScript event handler called after a drag object leaves zone
ondragstart | A JavaScript event handler called before drag operation
ondrop | It's an event that is called when something is dropped on a drop zone
ondropend | A JavaScript handler for event fired on a drop even the drop for a given type is not available
ondropout | A JavaScript event handler called after a out operation
ondropover | A JavaScript event handler called after a drop operation
onexpand | HTML: script expression to invoke on node expansion
onkeydown | HTML: a script expression; a key is pressed down
onkeypress | HTML: a script expression; a key is pressed and released
onkeyup | HTML: a script expression; a key is released
onmousedown | HTML: script expression; a pointer button is pressed down
onmousemove | HTML: a script expression; a pointer is moved within
onmouseout | HTML: a script expression; a pointer is moved away
onmouseover | HTML: a script expression; a pointer is moved onto
onmouseup | HTML: script expression; a pointer button is released
onselected | HTML: script expression to invoke on node selection
preserveDataInRequest | If "true", data is preserved in a request. Default value is "true".
preserveModel | Possible values are "state", "request", "none". Default value is "request"
process | Id['s] (in format of call UIComponent.findComponent()) of components, processed at the phases 2-5 in case of AjaxRequest caused by this component. Can be single id, comma-separated list of Id's, or EL Expression with array or Collection
rejectCursors | List of comma separated cursors that indicates when rejectable draggable over dropzone
rendered | If "false", this component is not rendered
requestDelay | Attribute defines the time (in ms.) that the request will be wait in the queue before it is ready to send. When the delay time is over, the request will be sent to the server or removed if the newest 'similar' request is in a queue already
reRender | Id['s] (in format of call UIComponent.findComponent()) of components, rendered in case of AjaxRequest caused by this component. Can be single id, comma-separated list of Id's, or EL Expression with array or Collection
rowKeyVar | The attribute provides access to a row key in a Request scope
selectedClass | Corresponds to the HTML class attribute. Applied to selected node
showConnectingLines | If "true", connecting lines are show
stateAdvisor | ValueBinding pointing at instance of class implementing org.richfaces.component.state.TreeStateAdvisor interface.
stateVar | The attribute provides access to a component state on the client side
status | ID (in format of call UIComponent.findComponent()) of Request status component
style | CSS style(s) is/are to be applied when this component is rendered
styleClass | Corresponds to the HTML class attribute
switchType | Tree switch algorithm: "client", "server", "ajax"
timeout | Response waiting time on a particular request. If a response is not received during this time, the request is aborted
toggleOnClick | If "false" do not toggle node state on click. If "true", than node will be toggles on click on ether node content, or node icon. Default value is "false".
treeNodeVar | The attribute provides access to a TreeNode instance in a Request scope
typeMapping | Map between a draggable type and an indicator name on zone. it's defined with the pair (drag type:indicator name))
value | The current value for this component
var | Attribute contains a name providing an access to data defined with value

Table 6.488. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.Tree
component-class | org.richfaces.component.html.HtmlTree
component-family | org.richfaces.Tree
renderer-type | org.richfaces.TreeRenderer
tag-class | org.richfaces.taglib.TreeTag

### 6.90.3. Creating the Component with a Page Tag

There are two ways to set up a tree: 1) with <rich:recursiveTreeNodesAdaptor> or <rich:treeNodesAdaptor> 2) and without them. The first method allows to omit "value" and "var" attributes definition as follows:

Example:

    ...

    <rich:tree>

        <rich:recursiveTreeNodesAdaptor roots="#{fileSystemBean.sourceRoots}" var="item" nodes="#{item.nodes}" />

    </rich:tree>

    ...

The second way requires defining some attributes, as it's shown in the example:

Example:

    ...

    <rich:tree value="#{library.data}" var="item" >

        <rich:treeNode  icon="/images/tree/singer.png" >

            <h:outputText value="#{item.name}" />

        </rich:treeNode>

        ...

    </rich:tree>

    ...

### 6.90.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.HtmlTree;

    ...

    HtmlTree myTree = new HtmlTree();

    ...

### 6.90.5. Details of Usage

As it has been mentioned above the <rich:tree> component allows rendering any tree-like data model.

The component interacts with data model via `"TreeNode"` interface (org.richfaces.model.TreeNode) that is used for tree nodes representation. The "value" attribute of the <rich:tree> component contains a nodes structure defined in a bean property. The property keeps a structure of objects that implements `"TreeNode"` interface.

<rich:treeNode> has a property "data" (see org.richfaces.model.TreeNode). Data contained in the property is placed in a request scope variable, which name is defined with "var" attribute for the <rich:tree> component.

You can develop and use your own pattern of the `"TreeNode"` interface or use a default implementation, which is defined with a default class `"TreeNodeImpl"` (org.richfaces.model.TreeNodeImpl).

There is a `"XmlTreeDataBuilder"` class (org.richfaces.component.xml.XmlTreeDataBuilder) that allows transforming XML into structures of objects containing `"XmlNodeData"` (org.richfaces.component.xml.XmlNodeData) instances as data, which could be represented by the <rich:tree> component.

It's possible to define a visual representation of a node data model (to define a node icon) and its behavior in correspondence with the data contained in this node (with a value of the "var" attribute). The node behavior is defined by the components nested into the <rich:treeNode> (e.g. links or buttons). For these purposes you should use "nodeFace" attribute. For each tree node a value of "nodeFace" attribute is evaluated and <rich:treeNode> with a value of "type" attribute equal to a value of "nodeFace" is used for node representation. See an example below.

Example:

    ...

    <h:form>

        <rich:tree style="width:300px" value="#{library.data}" var="item" nodeFace="#{item.type}">

            <rich:treeNode type="artist" iconLeaf="/images/tree/singer.png" icon="/images/tree/singer.png">

                <h:outputText value="#{item.name}" />

            </rich:treeNode>

            <rich:treeNode type="album" iconLeaf="/images/tree/disc.png" icon="/images/tree/disc.png">

                <h:outputText value="#{item.title}" />

            </rich:treeNode>

            <rich:treeNode type="song" iconLeaf="/images/tree/song.png" icon="/images/tree/song.png">

                <h:outputText value="#{item.title}" />

            </rich:treeNode>

        </rich:tree>

    </h:form>

    ...

This is a result:

Figure 6.294. The "nodeFace" attribute usage

In the example above, when each node of data model is processed, data contained in the `"data"` property of "TreeNode" interface is assigned to a request scope variable, which name is defined with "var" attribute. The value of the "nodeFace" attribute is evaluated in correspondence with the data assigned to the "var" attribute. The corresponding <rich:treeNode> component (with a value of "type" attribute equal to a value of "nodeFace" ) is used for the node representation. For example, during data model processing, an object with a name "Chris Rea" was inserted in the "var" attribute. Then the value of "nodeFace" attribute was evaluated as `"artist"`. Thus, for the node representation the <rich:treeNode> with "type" equal to "`artist`" was used.

You can also assign an EL-expression as value of the "nodeFace" attribute. See an example below:

Example:

    nodeFace="#{data.name != 'param-value' ? 'artist' : 'album'}"

There are some essential points in a "nodeFace" attribute usage: you need to define notions for typeless and a default nodes.

The typeless node is the first <rich:treeNode> component (from all children nodes nested to the <rich:tree> component) with not defined "type" attribute and defined "rendered" attribute. The typeless node is used for representation when "nodeFace" attribute is null.

Default node has the following interior presentation:

Example:

    ...

    <h:outputText value="#{varAttributeName}">

    ...

"varAttributeName" is a value for "var" attribute.

Default node is used in the following cases:

- "nodeFace" attribute is defined, but its value isn't equal to any "type" attribute value from all children nodes;

- "nodeFace" attribute is defined and its value is equal to a value of some "type" attribute from all children nodes, but the value of "rendered" attribute for this node is "false".

There is also one thing that has to be remembered using "type" and "rendered" attributes: it's possible to define several <rich:treeNode> components with equal values of "type" attribute and different values of "rendered" attribute. It provides a possibility to define different representation styles for the same node types. In the example with artists and their albums (see above) it's possible to represent albums that are available for sale and albums that are not available. Please study the example below:

Example:

    ...

    <h:form>

        <rich:tree style="width:300px" value="#{library.data}" var="item" nodeFace="#{item.type}">

        ...

            <rich:treeNode type="album" iconLeaf="/images/tree/album.gif" icon="/images/tree/album.gif"

                          rendered="#{item.exist}">

                <h:outputText value="#{item.name}" />

            </rich:treeNode>

            <rich:treeNode type="album" iconLeaf="/images/tree/album_absent.gif" icon="/images/tree/album_absent.gif"

                          rendered="#{not item.exist}">

                <h:outputText value="#{item.name}" />

            </rich:treeNode>

        ...

        </rich:tree>

    </h:form>

    ...

This is a result of the code:

Figure 6.295. The "type" and the "rendered" attributes usage

In the example the <rich:treeNode> components has equal values of the "type" attribute. Depending on value of the "rendered" attribute the corresponding <rich:treeNode> component is selected for node representation. If an album is available for sale the value of the "rendered" for the first <rich:treeNode> component is "true", for the second one is "false". Thus, the first <rich:treeNode> is selected for node representation.

Tree node can be run in tree modes. Modes can be specified with "switchType" attribute for <rich:tree> component.

- `Ajax` (default value) - Ajax submission is used performing the functionality. Note, that for collapse/expand operations an Ajax request is sent to the server and it can cause a short delay.

- `Server` - regular form of submission request is used.

- `Client` – all operations are performed totally on the client; no interaction with a server is involved. Full page content is reloaded after every action.

The "icon" , "iconCollapsed" , "iconExpanded" , "iconLeaf" attributes set the icons' images for the component. You can also define icons using facets with the same names. If the facets are defined, the corresponding attributes are ignored and facets' content is used as icons. By default the width of a rendered facet area is 16px.

Example:

    ...

    <rich:tree value="#{library.data}" var="item">

        ...

        <f:facet name="icon">

            <h:graphicImage value="/images/tree/singer.png "/>

        </f:facet>

        <f:facet name="iconCollapsed">

            <h:graphicImage value="/images/tree/singer.png" />

        </f:facet>

        <f:facet name="iconExpanded">

            <h:graphicImage value="/images/tree/singer.png" />

        </f:facet>

        <f:facet name="iconLeaf">

            <h:graphicImage value="/images/tree/song.png" />

        </f:facet>

        ...

    </rich:tree>

    ...

The <rich: tree> component can be used together with <rich: treeNodeAdaptor> . In this case there is no need to specify the attributes "value" and "var" . Besides, visual representation shouldn't be defined right in the tree. In this case a <rich: tree> tag is applied mainly for defining common attributes such as "ajaxSubmitSelection" etc.

Information about the "process" attribute usage you can find here.

## Tip:

"rowKeyConverter" support for the <rich:tree> is pending!

### 6.90.6. Built-In Drag and Drop

Words "built-in" in this context mean, that <rich:tree> component has its own attributes, that provide drag-and-drop capability. These attributes can be divided into two groups: those ones which provide drag and those which provide drop operations (see the tables below).

Table 6.489. Drag group

Attribute Name | Description
--- | ---
dragValue | Element value drag passed into processing after a Drop event
dragListener | A listener that processes a Drag event
dragIndicator | Id of a component that is used as a drag pointer during the drag operation
dragType | Defines a drag zone type that is used for definition of a dragged element, which can be accepted by a drop zone

Table 6.490. Drop group

Attribute Name | Description
--- | ---
dropValue | Element value drop passed into processing after Drop events
dropListener | A listener that processes a Drop event.
acceptedTypes | Drag zone names are allowed to be processed with a Drop zone
typeMapping | Drag zones names mapping on the corresponding drop zone parameters

Consider drag-and-drop inside a tree. All zones, which are assumed to be dragged, must be marked. In terms of <rich:tree> these zones completely correspond to tree nodes. So, all dragging nodes should be marked with "dragType" attribute. Then, to mark zone(-s), where the dragging node could be dropped, pass the type of dragging node to the "acceptedTypes" attribute of the drop zone. It would be good to itemize, that each tree node in the <rich:tree> component’s structure has its own key. Depending on how the component is used, these keys can be generated by the component itself or can be taken from the component’s data model. Keys help to identify each node in a tree; key is what exactly being passing from one node to another in drag-and-drop operations. Finally, the method binding, that will process drag-and-drop operation, should be pointed via "dropListener" attribute of the <rich:tree> .

Chapters "6.40 <dragIndicator>" and "6.39 <dndParam>" describes how to apply visual element, that show some additional information (e.g. dragging item name) while operating with drag-and-drop.

Page code, that describes a tree with built in drag-and-drop in the way it is considered, is shown below.

Example:

    ...

    <h:form>

         <rich:tree style="width:300px" value="#{libraryAjaxTree.data}" nodeFace="#{item.type}" var="item" dropListener="#{libraryAjaxTree.processDrop}" dragIndicator=":treeDragIndicator">

              <rich:treeNode type="artist" icon="/images/tree/group.png" iconLeaf="/images/tree/group.png" acceptedTypes="album">

                   <h:outputText value="#{item.name}" />

              </rich:treeNode>

              <rich:treeNode type="album" icon="/images/tree/cd.png" iconLeaf="/images/tree/cd.png" dragType="album" acceptedTypes="song">

                   <h:outputText value="#{item.title}" />

                   <rich:dndParam name="label" type="drag" value="Album: #{item.title}" />

              </rich:treeNode>

              <rich:treeNode type="song" icon="/images/tree/music.png" iconLeaf="/images/tree/music.png" dragType="song">

                   <h:outputText value="#{item.title}" />

                   <rich:dndParam name="label" type="drag" value="Song: #{item.title}" />

              </rich:treeNode>

        </rich:tree>

    </h:form>

    ...

This code renders following tree:

Figure 6.296. Drag-and-drop operations

### 6.90.7. Events handling

Listeners classes that process events on the server side are defined with the help of:

- changeExpandListener processes expand/collapse event of a treeNode

- dropListener processes a Drop event

- dragListener processes a Drag event

- nodeSelectListener is called during request sending on a node selecting event (if request sending on this event is defined)

Listener methods can be defined using the following attributes or using nested tags.

Client event attributes are:

- "onexpand" is a script expression to invoke when a node is expanded

- "oncollapse" is a script expression to invoke when a node is collapsed

- "ondragexit" is a script expression to invoke when an element passing out from a tree zone

- "ondragstart" is a script expression to invoke when dragging starts

- "ondragend" is a script expression to invoke when dragging ends (a drop event)

- "ondragenter" is a script expression to invoke when a dragged element appears on a tree

They can be used to add some JavaScript effects.

Standart HTML event attributes like "onclick" , "onmousedown" , "onmouseover" etc. can be also used. Event handlers of a <rich:tree> component capture events occured on any tree part. But event handlers of treeNode capture events occured on treeNode only, except for children events.

### 6.90.8. Look-and-Feel Customization

For skinnability implementation, the components use a style class redefinition method. Default style classes are mapped on skin parameters.

There are two ways to redefine the appearance of all <rich:tree> components at once:

- Redefine the corresponding skin parameters

- Add to your style sheets style classes used by a <rich:tree> component

### 6.90.9. Skin Parameters Redefinition:

There is only one skin parameter for <rich:tree> . As it's a wrapper component for <rich:treeNode> components, look and feel customization is described in the corresponding section.

Table 6.491. Skin parameters for a wrapper element

Skin parameters | CSS properties
--- | ---
overAllBackground | background-color

### 6.90.10. Definition of Custom Style Classes

Table 6.492. Classes names that define a component appearance

Class name | Description
--- | ---
rich-tree | Defines styles for a wrapper <div> element of a tree

In order to redefine styles for all <rich:tree> components on a page using CSS, it's enough to create classes with the same names (possible classes could be found in the table above) and define necessary properties in them. An example is placed below:

Example:

    ...

     .rich-tree{

        font-weight:bold;

    }

    ...

This is a result:

Figure 6.297. Redefinition styles with predefined classes

In the example a tree font weight was changed to bold.

Also it's possible to change styles of a particular <rich:tree> component. In this case you should create own style classes and use them in corresponding <rich:tree> styleClass attributes. An example is placed below:

Example:

    ...

    .myClass{

        font-weight:bold;

    }

    ...

The "highlightedClass" attribute for <rich:tree> is defined as it's shown in the example below:

Example:

    <rich:tree ... styleClass="myClass"/>

This is a result:

Figure 6.298. Redefinition styles with own classes and styleClass attributes

As it's shown on the picture above, font weight of highlighted text node of a tree was changed to bold.

### 6.90.11. Relevant Resources Links

Here you can see the example of <rich:tree> usage and sources for the given example.

How to Expand/Collapse Tree Nodes from code, see here.

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