6.10.9. < rich:progressBar > available since 3.2.0

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### 6.10.9. < rich:progressBar > available since 3.2.0

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#### 6.10.9.1. Description

The <rich:progressBar> component is designed for displaying a progress bar which shows the current status of the process.

Figure 6.93. <rich:progressBar> component

#### 6.10.9.2. Key Features

- Ajax or Client modes

- Option to control rerendering frequency

- Customizable status information label

- Highly customizable look and feel

#### 6.10.9.3. Details of Usage

As it was mentioned above, the <rich:progressBar> component displays the status of the ongoing process.

The <rich:progressBar> component can run in two modes: `Ajax` (default) and `Client`.

- `Ajax` - In this mode the component works the same way as <a4j:poll/> which gets the current progress value from the sever, repeating after a set time interval.

- `Client` - The current progress value in Client mode is set using JavaScript API

In order to define the mode you need to use "mode" attribute.

One of the key attributes of the component is "interval" which defines the frequency of status polling and rerenders the component when the value is updated.

Polling is active while the "enabled" attribute is "true".

Example:

    ...

    <rich:progressBar value="#{bean.incValue}" id="progrs" interval="900" enabled="true"/>

    ...

With the help of "timeout" attribute you can define the waiting time on a particular request. If a response is not received during this time the request is aborted.

Status of the process is calculated basing on values of the following attributes:

- "value" is a value binding to the current progress value

- "minValue" (default value is "0") sets minimal progress value

- "maxValue" (default value is "100") sets maximum progress value

Example:

    ...

    <rich:progressBar value="#{bean.incValue}"  minValue="50"  maxValue="400"/>

    ...

This is the result

Figure 6.94. Progress bar

There are two ways to display information on a progress bar:

- Using "label" attribute

  Example:

      ...

      <rich:progressBar value="#{bean.incValue}" id="progrs" label="#{bean.incValue}"/>

      ...

- Using any child(nested) components. One of the components that can be used is <h:outputText />

  Example:

      ...

      <rich:progressBar value="#{bean.incValue}">

          <h:outputText value="#{bean.incValue} %"/>

      </rich:progressBar>

      ...

The <rich:progressBar> component provides 3 predefined macrosubstitution parameters:

- `{value}` contains the current value

- `{minValue}` contains min value

- `{maxValue}` contains max value

You can use them as follows:

Example:

    ...

    <rich:progressBar value="#{bean.incValue1}" minValue="400" maxValue="900">

            <h:outputText value="Min value is {minValue}, current value is {value}, max value is {maxValue}"/>

    </rich:progressBar>

    ...

This is the result:

Figure 6.95. Macrosubstitution

The "parameters" is also a special attribute which defines parameters that can be to get additional data from server (e.g. additional info about process status). All you need is to define the value of your own parameter (e.g `parameters="param:'#{bean.incValue1}'"`) and you can use it to pass the data.

Example:

    ...

    <rich:progressBar value="#{bean.incValue}" parameters="param:'#{bean.dwnlSpeed}'">

        <h:outputText value="download speed {param} KB/s"/>

    </rich:progressBar>

    ...

This is the result:

Figure 6.96. Usage of parameters

The "progressVar" attribute (deprecated) defines request scoped variable that could be used for substitution purpose. This variable contains the data taken from "value" attribute. Please, study carefully the following example.

Example:

    ...

    <rich:progressBar value="#{bean.incValue1}" enabled="#{bean.enabled1}" id="progrs1" progressVar="progress">

        <h:outputText value="{progress}%"/>

    </rich:progressBar>

    ...

In the shown example "progressVar" attribute defines a variable "progress" with the value taken from "value" attribute of the <rich:progressBar> component. The "progress" variable performs substitution passing the current progress value to the "value" attribute of the <h:outputText> . This is how the current value of a progress appears on the label of <rich:progressBar> .

As the "progressVar" attribute is deprecated, it's better to use the predefined macrosubstitution parameter `{value}` instead. See how you can rewrite the above example with the help of `{value}`.

Example:

    ...

    <rich:progressBar value="#{bean.incValue1}" enabled="#{bean.enabled1}" id="progrs1">

        <h:outputText value="{value}%"/>

    </rich:progressBar>

    ...

The component can also employ "initial" and "complete" facets to display the states of the process: "initial" facet is displayed when the progress value is less or equal to "minValue" , and the "complete" facet is shown when the value is greater or equal to "maxValue" . Please see an example below.

Example:

    ...

    <rich:progressBar value="#{bean.incValue1}">

        <f:facet name="initial">

            <h:outputText value="Process not started"/>

        </f:facet>

        <f:facet name="complete">

            <h:outputText value="Process completed"/>

        </f:facet>

    </rich:progressBar>

     ...

Information about the "process" attribute usage you can find " Decide what to process " guide section.

#### 6.10.9.4. Reference Data

Table of <rich:progressBar> attributes.

Table 6.131. Component Identification Parameters

Name | Value
--- | ---
component-type | org.richfaces.ProgressBar
component-class | org.richfaces.component.html.HtmlProgressBar
component-family | org.richfaces.ProgressBar
renderer-type | org.richfaces.renderkit.ProgressBarRenderer
tag-class | org.richfaces.taglib.ProgressBarTag

Table 6.132. JavaScript API

Function | Description
--- | ---
enable() | Begins polling for Ajax mode
disable() | Stops polling for Ajax mode
setValue(value) | Updates the progress of the process
setLabel(label) | Update the label for the process

Table 6.133. Facets

Facet name | Description
--- | ---
initial | Defines the information content about the state of the process if the progress value is less or equal to "minValue"
complete | Defines the information content about the state of the process if the value is greater or equal to "maxValue"

Table 6.134. Classes names for the progressBar without a label

Class name | Description
--- | ---
rich-progress-bar-shell | Defines styles for a wrapper <div> element of a progressBar
rich-progress-bar-uploaded | Defines styles for the completed progress area
rich-progress-bar-height | Defines height for a progressBar
rich-progress-bar-width | Defines width for a progressBar

Table 6.135. Classes names for the progressBar with a label

Class name | Description
--- | ---
rich-progress-bar-shell-dig | Defines styles for a wrapper <div> element of a progressBar
rich-progress-bar-uploaded-dig | Defines styles for the label
rich-progress-bar-remained | Defines styles for the remained progress area
rich-progress-bar-completed | Defines styles for the completed progress area
rich-progress-bar-height-dig | Defines height for a progressBar
rich-progress-bar-width | Defines width for a progressBar

## Note:

It's necessary to define width of the component in pixels only.

You can find all necessary information about style classes redefinition in Definition of Custom Style Classes section.

#### 6.10.9.5. Relevant Resources Links

On the component Live Demo page you can see the example of <rich:progressBar> usage and sources for the given example.

Read "Simple Ping Application with <rich:progressBar>" article to find out how to show the progress of server ping process.

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