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## 6.31. < rich:contextMenu >

### 6.31.1. Description

The <rich:contextMenu> component is used for creation multileveled context menus that are activated after a user defines an event ( "onmouseover" , "onclick" , etc.) on any element on the page.

Figure 6.29. <rich:contextMenu> component

### 6.31.2. Key Features

- Highly customizable look and feel

- "oncontextmenu" event support

- Disablement support

- Pop-up appearance event customization

- Usage of shared instance of a menu on a page

Table 6.110. rich : contextMenu attributes

Attribute Name | Description
--- | ---
attached | If the value of the "attached" attribute is true, the component is attached to the component, specified in the "attachTo" attribute or to the parent component, if "attachTo" is not defined. Default value is "true".
attachTiming | Defines the timing when the menu is attached to the target element. Possible values "onload", "immediate", "onavailable" (default). Default value is "onavailable".
attachTo | Client identifier of the component or id of the existing DOM element that is a source for a given event. If attachTo is defined, the event is attached on the client according to the AttachTiming attribute. If both attached and attachTo attributes are defined, and attribute attached has value 'false', it is considered to have higher priority.
binding | The attribute takes a value-binding expression for a component property of a backing bean
disableDefaultMenu | Forbids default handling for adjusted event. Default value "true".
disabledItemClass | Space-separated list of CSS style class(es) that are be applied to disabled item of this component
disabledItemStyle | CSS style(s) is/are to be applied to disabled item when this component is rendered.
event | Defines an event on the parent element to display the menu. Default value is "oncontextmenu".
hideDelay | Delay between losing focus and menu closing. Default value is "800".
id | Every component may have a unique id that is automatically created if omitted
itemClass | Space-separated list of CSS style class(es) that are be applied to item of this component
itemStyle | CSS style(s) is/are to be applied to item when this component is rendered.
oncollapse | Event must occurs on menu closure
onexpand | Event must occurs on menu opening
ongroupactivate | HTML: script expression; some group was activated
onitemselect | HTML: script expression; some item was selected
onmousemove | HTML: script expression; a pointer was moved within
onmouseout | HTML: script expression; a pointer was moved away
onmouseover | HTML: script expression; a pointer was moved onto
popupWidth | Set minimal width for the all of the lists that will appear
rendered | If "false", this component is not rendered
selectItemClass | Space-separated list of CSS style class(es) that are be applied to selected item of this component.
selectItemStyle | CSS style(s) is/are to be applied to selected item when this component is rendered.
showDelay | Delay between event and menu showing. Default value is "50".
style | CSS style(s) is/are to be applied when this component is rendered
styleClass | Corresponds to the HTML class attribute
submitMode | Sets the submission mode for all menu items of the menu except those where this attribute redefined. Possible value are "ajax","server", "none". Default value is "server".

Table 6.111. Component identification parameters

Name | Value
--- | ---
component-type | org.richfaces.ContextMenu
component-class | org.richfaces.component.html.ContextMenu
component-family | org.richfaces.ContextMenu
renderer-type | org.richfaces.DropDownMenuRenderer
tag-class | org.richfaces.taglib.ContextMenuTagHandler

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

To create the simplest variant on a page use the following syntax:

Example:

    ...

    <rich:contextMenu event="oncontextmenu" attached="true">

    ...

### 6.31.4. Creating the Component Dynamically Using Java

Example:

    import org.richfaces.component.html.ContextMenu;

    ...

    html.ContextMenu myContextMenu = new html.ContextMenu();

    ...

### 6.31.5. Details of Usage

<rich:contextMenu> is a support-like component. Context menu itself is an invisible panel that appears after a particular client side event ( "onmouseover" , "onclick" , etc.) occurred on a parent component. The event is defined with an "event" attribute. The component uses "oncontextmenu" event by default to call a context menu by clicking on the right mouse button.

<rich:menuGroup> , <rich:menuItem> and <rich:menuSeparator> components are used as nested elements for <rich:contextMenu> in the same way as for <rich:dropDownMenu> .

If "attached" value is "true" (default value), component is attached to the parent component or to the component, which "id" is specified in the "attachTo" attribute. An example is placed below.

Example:

    ...

            <rich:contextMenu event="oncontextmenu" attachTo="pic1" submitMode="none">

                <rich:menuItem value="Zoom In" onclick="enlarge();" id="zin"/>

                <rich:menuItem value="Zoom Out" onclick="decrease();" id="zout"/>

            </rich:contextMenu>

            <h:panelGrid columns="1" columnClasses="cent">

                    <h:panelGroup id="picture">

                            <h:graphicImage value="/richfaces/jQuery/images/pic1.png" id="pic"/>

                    </h:panelGroup>

            </h:panelGrid>

            <h:panelGrid columns="1" columnClasses="cent">

                    <h:panelGroup id="picture1">

                            <h:graphicImage value="/richfaces/jQuery/images/pic2.png" id="pic1"/>

                    </h:panelGroup>

            </h:panelGrid>

    ...

The `"enlarge()"` and `"decrease()"` functions definition is placed below.

    ...

            <script type="text/javascript">

                    function enlarge(){

                            document.getElementById('pic').width=document.getElementById('pic').width*1.1;

                            document.getElementById('pic').height=document.getElementById('pic').height*1.1;

                    }

                    function decrease(){

                            document.getElementById('pic').width=document.getElementById('pic').width*0.9;

                            document.getElementById('pic').height=document.getElementById('pic').height*0.9;

                    }

            </script>

    ...

In the example a picture zooming possibility with <rich:contextMenu> component usage was shown. The picture is placed on the <h:panelGroup> component. The <rich:contextMenu> component is not nested to <h:panelGroup> and has a value of the "attachTo" attribute defined as `"pic1"`. Thus, the context menu is attached to the component, which "id" is `"pic1"`. The context menu has two items to zoom in (zoom out) a picture by "onclick" event. For earch item corresponding JavaScript function is defined to provide necessary action as a result of the clicking on it. For the menu is defined an "oncontextmenu" event to call the context menu on a right click mouse event.

In the example the context menu is defined for the parent <h:panelGroup> component with a value of "id" attribute equal to "`picture`" You should be careful with such definition, because a client context menu is looked for a DOM element with a client Id of a parent component on a server. If a parent component doesn't encode an Id on a client, it can't be found by the <rich:contextMenu> and it's attached to its closest parent in a DOM tree.

If the "attached" attribute has "false" value, component activates via JavaScript API with assistance of <rich:componentControl> . An example is placed below.

Example:

    ...

            <h:form id="form">

                    <rich:contextMenu attached="false" id="menu" submitMode="ajax">

                            <rich:menuItem ajaxSingle="true">

                                    <b>{car} {model}</b> details

                                    <a4j:actionparam name="det" assignTo="#{ddmenu.current}" value="{car} {model} details"/>

                            </rich:menuItem>

                            <rich:menuGroup value="Actions">

                                    <rich:menuItem ajaxSingle="true">

                                            Put <b>{car} {model}</b> To Basket

                                            <a4j:actionparam name="bask" assignTo="#{ddmenu.current}" value="Put {car} {model} To Basket"/>

                                    </rich:menuItem>

                                    <rich:menuItem value="Read Comments" ajaxSingle="true">

                                            <a4j:actionparam name="bask" assignTo="#{ddmenu.current}" value="Read Comments"/>

                                    </rich:menuItem>

                                    <rich:menuItem ajaxSingle="true">

                                            Go to <b>{car}</b> site

                                            <a4j:actionparam name="bask" assignTo="#{ddmenu.current}" value="Go to {car} site"/>

                                    </rich:menuItem>

                            </rich:menuGroup>

                    </rich:contextMenu>

                    <h:panelGrid columns="2">

                            <rich:dataTable value="#{dataTableScrollerBean.tenRandomCars}" var="car" id="table"

                                                            onRowMouseOver="this.style.backgroundColor='#F8F8F8'"

                                                            onRowMouseOut="this.style.backgroundColor='#{a4jSkin.tableBackgroundColor}'" rowClasses="cur">

                                    <rich:column>

                                            <f:facet name="header">Make</f:facet>

                                            <h:outputText value="#{car.make}"/>

                                    </rich:column>

                                    <rich:column>

                                            <f:facet name="header">Model</f:facet>

                                            <h:outputText value="#{car.model}"/>

                                    </rich:column>

                                    <rich:column>

                                            <f:facet name="header">Price</f:facet>

                                            <h:outputText value="#{car.price}" />

                                    </rich:column>

                                    <rich:componentControl event="onRowClick" for="menu" operation="show">

                                        <f:param value="#{car.model}" name="model"/>

                                        <f:param value="#{car.make}" name="car"/>

                                    </rich:componentControl>

                            </rich:dataTable>

                            <a4j:outputPanel ajaxRendered="true">

                                    <rich:panel>

                                            <f:facet name="header">Last Menu Action</f:facet>

                                            <h:outputText value="#{ddmenu.current}"></h:outputText>

                                    </rich:panel>

                            </a4j:outputPanel>

                    </h:panelGrid>

            </h:form>

     ...

This is a result:

Figure 6.30. The "attached" attribute usage

In the example the context menu is activated (by clicking on the left mouse button) on the table via JavaScript API with assistance of <rich:componentControl> . The attribute "for" contains a value of the <rich:contextMenu> Id. For menu appearance Java Script API function `"show()"` is used. It is defined with "operation" attribute for the <rich:componentControl> component. Context menu is recreated after the every call on a client and new {car} and {model} values are inserted in it. In the example for a menu customization macrosubstitutions were used.

The <rich:contextMenu> component can be defined once on a page and can be used as shared for different components (this is the main difference from the <rich:dropDownMenu> component). It's necessary to define it once on a page (as it was shown in the example above) and activate it on required components via JavaScript API with assistance of <rich:componentControl> .

The <rich:contextMenu> "submitMode" attribute can be set to three possible parameters:

- `Server` (default)

Regular form submition request is used

- `Ajax`

Ajax submission is used for switching

- `None`

The "action" and "actionListener" item's attributes are ignored. Menu items don't fire any submits themselves. The behavior is fully defined by the components nested inside items.

## Note:

As the <rich:contextMenu> component doesn't provide its own form, use it between <h:form> and </h:form> tags.

## Note:

When using <rich:contextMenu> component with <h:outputText> JSF component, specify id for <h:outputText> or move <rich:contextMenu> out from <h:outputText> to provide component's correct work.

### 6.31.6. JavaScript API

Table 6.112. JavaScript API

Function | Description | Apply to
--- | --- | ---
hide() | Hides component or group | Component, group
show(event, context) | Shows component or group | Component, group

### 6.31.7. 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:contextMenu> components at once:

- Redefine the corresponding skin parameters

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

### 6.31.8. Skin Parameters Redefinition

Table 6.113. Skin parameters redefinition for a border

Skin parameters | CSS properties
--- | ---
panelBorderColor | border-color
additionalBackgroundColor | background-color

Table 6.114. Skin parameters redefinition for a background

Skin parameters | CSS properties
--- | ---
additionalBackgroundColor | border-top-color
additionalBackgroundColor | border-left-color
additionalBackgroundColor | border-right-color

### 6.31.9. Definition of Custom Style Classes

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

Figure 6.31. Style classes

Table 6.115. Classes names that define the contextMenu element

Class name | Description
--- | ---
rich-menu-list-border | Defines styles for borders
rich-menu-list-bg | Defines styles for a general background list
rich-menu-list-strut | Defines styles for a wrapper <div> element for a strut of a popup list

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

Example:

    ...

    .rich-menu-item{

            font-style:italic;

    }

    ...

This is a result:

Figure 6.32. Redefinition styles with predefined classes

In the example the font style for row items was changed.

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

Example:

    ...

    .myClass{

            font-weight:bold;

    }

    ...

The "rowClasses" attribute for <h:panelGrid> is defined as it's shown in the example below:

Example:

    <h:panelGrid ... rowClasses="myClass"/>

This is a result:

Figure 6.33. Redefinition styles with own classes and styleClass attributes

As it could be seen on the picture above, the font weight for row items was changed.

### 6.31.10. Relevant Resources Links

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

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