Package org.apache.tapestry5.corelib.components

## Class ProgressiveDisplay

- java.lang.Object
- - org.apache.tapestry5.corelib.components.ProgressiveDisplay

-     @SupportsInformalParameters
      @Events("progressiveDisplay")
      public class ProgressiveDisplay
      extends Object

  A component used to implement the progressive enhancement web design strategy; the component renders itself with a simplified initial content (i.e., "loading ...") and an Ajax request then supplies the component's true body. This results in much faster page loads. You can even nest these! The component simply does not render its body on initial render. On the subsequent action event request, it fires a `EventConstants.PROGRESSIVE_DISPLAY` event to inform the container about the (optional) event context. The event handler method may return a renderable object; if not then the component's body is rendered as the partial markup response.
  Since:
    5.1.0.1

  Component Parameters
  Name | Type | Flags | Default | Default Prefix
  --- | --- | --- | --- | ---
  context | Object[] |  |  | prop
  If provided, this is the event context, which will be provided via the event.
  initial | org.apache.tapestry5.Block |  | block:defaultInitial | literal
  The initial content to display until the real content arrives. Defaults to "Loading ..." and an Ajax activity icon.
  update | String |  |  | literal
  Name of a function on the client-side Tapestry.ElementEffect object that is invoked after the elements's body content has been updated. If not specified, then the basic "highlight" method is used, which performs a classic "yellow fade" to indicate to the user that and update has taken place.

  Component Events
  Name | Description
  --- | ---
  progressiveDisplay |

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `ProgressiveDisplay()` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `Block` | `getBody()` | Returns the body of the ProgressiveDisplay, which is sometimes (in the context of a AjaxResponseRenderer.addRender(org.apache.tapestry5.ClientBodyElement) partial page render}) the content to be included.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### ProgressiveDisplay

          public ProgressiveDisplay()

  - ### Method Detail

    - #### getBody

          public Block getBody()

      Returns the body of the ProgressiveDisplay, which is sometimes (in the context of a AjaxResponseRenderer.addRender(org.apache.tapestry5.ClientBodyElement) partial page render}) the content to be included.
      Returns:
        body of component
      Since:
        5.2.0