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## 6.92. < rich:treeNode >

### 6.92.1. Description

The <rich:treeNode> component is designed for creating sets of tree elements within a <rich:tree> component.

Figure 6.302. <rich:treeNode> component

### 6.92.2. Key Features

- Possibility to assign different icon images for each node within a tree

- Drag and Drop support

- Look-and-Feel customization

Table 6.507. rich : treeNode 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
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 | An algorithm of AJAX request submission. Possible values are "inherit", "true", "false". Default value is "inherit".
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
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 "getUITree().getDragValue()".
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 "getUITree().getDropValue()".
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
limitToList | If "true", then of all AJAX-rendered on the page components only those will be updated, which ID's are passed to the "reRender" attribute of the describable component. "false"-the default value-means that all components with ajaxRendered="true" will be updated.
nodeClass | Name of node CSS class
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
oncontextmenu | JavaScript handler to be called on right click. Returning false prevents default browser context menu from being displayed
ondblclick | HTML: a script expression; a pointer button is double-clicked
ondragend | A JavaScript event handler called after a drag operation. Default value is "getDefaultOndragend()".
ondragenter | A JavaScript event handler called on enter draggable object to zone. Default value is "getDefaultOndragenter()".
ondragexit | A JavaScript event handler called after a drag object leaves zone. Default value is "getDefaultOndragexit()".
ondragstart | A JavaScript event handler called before drag object. Default value is "getDefaultOndragstart()".
ondrop | It's an event that is called when something is dropped on a drop zone. Default value is "getDefaultOndrop()".
ondropend | A JavaScript handler for event fired on a drop even the drop for a given type is not available. Default value is "getDefaultOndropend()".
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
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. Default value is "getDefaultReRender()".
selectedClass | Corresponds to the HTML class attribute. Applied to selected node
similarityGroupingId | similarityGroupingId
status | ID (in format of call UIComponent.findComponent()) of Request status component
timeout | Gets timeout in ms. Default value is "getDefaultTimeout()".
type | A node type
typeMapping | Map between a draggable type and an indicator name on zone. it's defined with the pair (drag type:indicator name))

Table 6.508. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.TreeNode
component-class | org.richfaces.component.html.HtmlTreeNode
component-family | org.richfaces.TreeNode
renderer-type | org.richfaces.TreeNodeRenderer
tag-class | org.richfaces.taglib.TreeNodeTag

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

Here is a simple example as it can be used on a page:

Example:

    ...

        <rich:tree ... faceNode="simpleNode">

            <rich:treeNode type="simpleNode">

                <!--Tree node data displaying template-->

            </rich:treeNode>

        </rich:tree>

    ...

### 6.92.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.HtmlTreeNode;

    ...

    HtmlTreeNode myPanel = new HtmlTreeNode();

    ...

### 6.92.5. Details of Usage

The "icon" , "iconCollapsed" , "iconExpanded" , "iconLeaf" attributes define icons for the component. Also you can define icons using facets with the same names. If the facets are defined, the corresponding attributes are ignored and facets contents are used as icons. The width of a rendered facet area is 16px.

    ...

        <rich:tree ...>

            ...

            <rich:treeNode ...>

                <f:facet name="icon">

                    <outputText value="A"/>

                </f:facet>

                <f:facet name="iconCollapsed">

                    <outputText value="B"/>

                </f:facet>

                <f:facet name="iconExpanded">

                    <outputText value="C"/>

                </f:facet>

                <f:facet name="iconLeaf">

                    <outputText value="D"/>

                </f:facet>

            </rich:treeNode>

            ...

        </rich:tree>

    ...

As it has been mentioned above, <rich:treeNode> defines a template for nodes rendering in a tree. Thus, during XML document rendering (a web.xml application) as a tree, the following nodes output (passed via `var="data"` on a tree) happens:

Example:

    ...

        <rich:tree ... faceNode="simpleNode" ... value="#{bean.data}" var="data">

            <rich:treeNode type="simpleNode">

                <h:outputText value="context-param:"/>

                <h:inputText value="#{data.name}"/>

            </rich:treeNode>

        </rich:tree >

    ...

Figure 6.303. Nodes output

Hence, <h:outputText /> tag outputs the `"context-param"` string and then the <h:inputText /> outputs the `data.name` element of this node.

Different nodes for rendering could be defined depending on some conditions on the tree level. Each condition represents some rendering template. To get more information on various treeNodesAdaptorAdaptor definition for nodes, see the tree component chapter.

Switching between expanded/collapsed modes is also managed on the tree level and defined in the corresponding section.

Default nodes of the tree level as well as the ones defined with the treeNodesAdaptorAdaptor component could send Ajax requests when selected with the mouse, it's managed with the "ajaxSubmitSelection" attribute (true/false).

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

### 6.92.6. Built-in Drag and Drop

The main information on Drag and Drop operations is given in the corresponding paragraph of the tree component chapter. It's only necessary to mention that each node could also be a Drag element as well as a Drop container, i.e. the container and the element have all attributes, listeners and ways of behavior similar to the ones of the <rich:dragSupport > and <rich:dropSupport > components simultaneously.

### 6.92.7. Events Handling

Just as Drag and Drop operations it corresponds to the one described on the tree component level for a default Node.

### 6.92.8. 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:treeNode> components at once:

- Redefine the corresponding skin parameters

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

### 6.92.9. Skin Parameters Redefinition

Table 6.509. Skin parameters for a node element

Skin parameters | CSS properties
--- | ---
panelTextColor | color
preferableDataSizeFont | font-size
preferableDataFamilyFont | font-family

Table 6.510. Skin parameters for a selected element

Skin parameters | CSS properties
--- | ---
headerBackgroundColor | border-color
panelTextColor | color
selectControlColor | color

Table 6.511. Skin parameters for a mouseovered element

Skin parameters | CSS properties
--- | ---
selectControlColor | color

### 6.92.10. Definition of Custom Style Classes

On the screenshot there are classes names that define styles for component elements.

Figure 6.304. Classes names

Table 6.512. Classes names that define a node element

Class name | Description
--- | ---
rich-tree-node | Defines styles for a tree node
rich-tree-node-handleicon | Defines styles for a tree node handleicon
rich-tree-node-children | Defines styles for all tree node subnodes
rich-tree-node-text | Defines styles for a tree node text
rich-tree-node-icon | Defines styles for a tree node icon
rich-tree-node-icon-leaf | Defines styles for a tree node icon leaf

Table 6.513. Classes names that define states for a node element

Class name | Description
--- | ---
rich-tree-node-selected | Defines styles for a selected tree node
rich-tree-node-highlighted | Defines styles for a highlighted tree node
rich-tree-node-handleicon-collapsed | Defines styles for a collapsed tree node handleicon
rich-tree-node-handleicon-expanded | Defines styles for a expanded tree node handleicon

In order to redefine the style for all <rich:treeNode> components on a page using CSS, it's enough to create classes with the same names and define the necessary properties in them.

To change the style of particular <rich:treeNode> components define your own style classes in the corresponding <rich:treeNode> attributes.

It is also possible to change look and feel of specific <rich:treeNode> with the help of defining for them "selectedClass" and "highlightedClass" attributes by their specific classes.

### 6.92.11. Relevant Resources Links

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

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