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Summary

Tag name: <tr:processChoiceBar>
UIComponent class: org.apache.myfaces.trinidad.component.core.nav.CoreProcessChoiceBar
Component type: org.apache.myfaces.trinidad.CoreProcessChoiceBar

Naming container: Yes. When referring to children of this component ("partialTriggers", findComponent(), etc.), you must prefix the child's ID with this component's ID and a colon (':').

ProcessChoiceBar is a UIXProcess component that renders a previous button, a choice bar, and a next button.

Model

The processChoiceBar takes a model of type org.apache.myfaces.trinidad.model.MenuModel. The last node along the focusPath and its siblings are rendered.

MenuModel extends TreeModel, but it also knows how to go from the current viewId to the focus path. Notice that the menuModel has no special knowledge of page navigation and places no requirements on the nodes that go into the tree. The nodes in the tree are stamped out with the 'nodeStamp' facet, which should contain a commandNavigationItem component, which allows the default actionListener mechanism to be used for page navigation.

There are two common scenarios for processes, "Plus One" and "Max Visited" which are explained below.

  • "Plus One" - from the current step the user can navigate to any previous page and the next page. If the user is on the 5th step of a process and goes back to step 2, then the user can only navigate from step 2 to step 1 and step 3.
  • "Max Visited" - the user can navigate to the max visited page. If the user is currently on the max visited page then the user can also navigate to the next page. If the user is on the 5th step of a process and goes back to step 2, then the user can navigate from step 2 to steps 1, 2, 3, 4, and 5.
The class org.apache.myfaces.trinidad.model.ProcessMenuModel and org.apache.myfaces.trinidad.model.ProcessUtils were created to support the "Plus One" and "Max Visited" scenarios. Please see the javadoc for these classes for more information.

On browsers that support disabled items in the drop down, the unreachable items will look disabled, otherwise they will not be rendered.

Example(s):

This is an example of a processChoiceBar.

<tr:processChoiceBar var="node" value="#{processMenuModel}">
  <f:facet name="nodeStamp">
    <tr:commandNavigationItem text="#{node.label}"
                              action="#{node.getOutcome}"
                              immediate="#{processMenuModel.immediate}"
                              readOnly="#{processMenuModel.readOnly}"/>
  </f:facet>
</tr:processChoiceBar>

Events

Type Phases Description
org.apache.myfaces.trinidad.event.AttributeChangeEvent Invoke Application,
Apply Request Values		 Event delivered to describe an attribute change. Attribute change events are not delivered for any programmatic change to a property. They are only delivered when a renderer changes a property without the application's specific request. An example of an attribute change events might include the width of a column that supported client-side resizing.

Supported Facets

Name Description
nodeStamp the component to use to stamp each element in the process. A CommandNavigationItem is expected.

Attributes

Name Type Supports EL? Description
attributeChangeListener javax.el.MethodExpression Only EL a method reference to an attribute change listener. Attribute change events are not delivered for any programmatic change to a property. They are only delivered when a renderer changes a property without the application's specific request. An example of an attribute change events might include the width of a column that supported client-side resizing.
binding org.apache.myfaces.trinidad.component.core.nav.CoreProcessChoiceBar Only EL an EL reference that will store the component instance on a bean. This can be used to give programmatic access to a component from a backing bean, or to move creation of the component to a backing bean.
id String No the identifier for the component. The identifier must follow a subset of the syntax allowed in HTML:
  • Must not be a zero-length String.
  • First character must be an ASCII letter (A-Za-z) or an underscore ('_').
  • Subsequent characters must be an ASCII letter or digit (A-Za-z0-9), an underscore ('_'), or a dash ('-').
inlineStyle String Yes the CSS styles to use for this component.
onclick String Yes an onclick Javascript handler.
ondblclick String Yes an ondblclick Javascript handler.
onkeydown String Yes an onkeydown Javascript handler.
onkeypress String Yes an onkeypress Javascript handler.
onkeyup String Yes an onkeyup Javascript handler.
onmousedown String Yes an onmousedown Javascript handler.
onmousemove String Yes an onmousemove Javascript handler.
onmouseout String Yes an onmouseout Javascript handler.
onmouseover String Yes an onmouseover Javascript handler.
onmouseup String Yes an onmouseup Javascript handler.
partialTriggers String[] Yes the IDs of the components that should trigger a partial update.

This component will listen on the trigger components. If one of the trigger components receives an event that will cause it to update in some way, this component will request to be updated too.

Separate multiple triggers with a space. e.g., partialTriggers="cmp1 cmp2"

Identifiers must account for NamingContainers. You can use a single colon to start the search from the root, or use multiple colons to move up through the NamingContainer. For example, "::" will pop out of this component's naming container (it pops out of itself if it is a naming container), ":::" will pop out of two naming containers, etc. The search for the partialTrigger begins from there. e.g., partialTriggers=":::commandButton1" the search begins for the component with id = commandButton1 after popping out of two naming containers relative to this component. To go into naming containers, you separate the naming containers with ':', e.g.,partialTriggers= "nc1:nc2:nc3:componentId".
rendered boolean Yes whether the component is rendered. When set to false, no output will be delivered for this component (the component will not in any way be rendered, and cannot be made visible on the client).
shortDesc String Yes The short description of the component. This text is commonly used by user agents to display tooltip help text.
styleClass String Yes a CSS style class to use for this component.
value Object Yes the hierarchy of data - must be of type org.apache.myfaces.trinidad.model.MenuModel
var String No Name of the EL variable used to reference each element of this collection. Once this component has completed rendering, this variable is removed (or reverted back to its previous value).
varStatus String No Name of the EL variable used to reference the varStatus information. Once this component has completed rendering, this variable is removed (or reverted back to its previous value). The VarStatus provides contextual information about the state of the component to EL expressions. For components that iterate, varStatus also provides loop counter information. Please see the this component's documentation for the specific properties on the varStatus. The common properties on varStatus include:
  • "model" - returns the CollectionModel for this component
  • "index" - returns the zero based row index