Project Documentation


Tag name: <tr:progressIndicator>
UIComponent class: org.apache.myfaces.trinidad.component.core.output.CoreProgressIndicator
Component type: org.apache.myfaces.trinidad.CoreProgressIndicator

The progress is tracked from the org.apache.myfaces.trinidad.model.BoundedRangeModel attached to this component through its 'value' attribute. The progressIndicator element goes to an indeterminate mode and shows up as a spinner animation if the 'value' or 'maximum' from the BoundedRangeModel is unknown. When these gets known the component switches to a determinate mode and renders a progress bar indicating percentage of task completion. Once the task is complete, ActionEvent is queued and, the page indicated by outcome of 'action' attribute is navigated to.

The progressIndicator component needs to have a poll component from the page as a partial trigger, in order that it be updated at regular intervals in PPR mode as determined by the pollInterval from the poll component.


Basic example to create a progressIndicator component attached to a poll component:

<tr:poll pollInterval="2000" id="pollid"/>
<tr:progressIndicator id="progress_widget"


Type Phases Description
javax.faces.event.ActionEvent Any Phase,
Invoke Application
Event delivered when the "action" of the component has been invoked; for example, by clicking on a button. The action may result in page navigation.
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.


Name Type Supports EL? Description
action javax.faces.el.MethodBinding Yes A reference to an action method sent by the progress component, or the static outcome of an action. This is invoked when the task under progress is complete.
actionListener javax.faces.el.MethodBinding Only EL A method reference to an action listener. This is invoked after the task in progress is complete.
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.output.CoreProgressIndicator 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 ('-').
immediate boolean Yes whether data validation - client-side or server-side - will be skipped when events are generated by this component. When immediate is true, the command's action and ActionListeners, including the default ActionListener provided by the JavaServer Faces implementation, will be executed during Apply Request Values phase of the request processing lifecycle, rather than waiting until the Invoke Application phase. Because validation runs during Process Validators (after Apply Request Values, but before Invoke Application), setting immediate to true will skip validation.
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 data model being used by this progress component. The model should be of type org.apache.myfaces.trinidad.model.BoundedRangeModel.