Package org.apache.tapestry5.corelib.components

## Class Hidden

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

- All Implemented Interfaces:
    `ClientElement`

      @SupportsInformalParameters
      public class Hidden
      extends Object
      implements ClientElement

  Used to record a page property as a value into the form. The value is encoded when the form is rendered, then decoded after the form is submitted back to the server, and the "value" parameter updated. The encoding and decoding is done via a `ValueEncoder`, therefore you must either bind the "encoder" parameter to a ValueEncoder or use an entity type for the "value" parameter for which Tapestry can provide a ValueEncoder automatically.
  Since:
    5.1.0.2

  Component Parameters
  Name | Type | Flags | Default | Default Prefix
  --- | --- | --- | --- | ---
  encoder | org.apache.tapestry5.ValueEncoder | Required |  | prop
  A ValueEncoder used to convert the server-side object provided by the "value" parameter into a unique client-side string (typically an ID) and back. Note: this parameter may be OMITTED if Tapestry is configured to provide a ValueEncoder automatically for the type of property bound to the "value" parameter.
  nulls | org.apache.tapestry5.NullFieldStrategy |  | default | nullfieldstrategy
  Defines how nulls on the server side, or sent from the client side, are treated. The selected strategy may replace the nulls with some other value. The default strategy leaves nulls alone. Another built-in strategy, zero, replaces nulls with the value 0.
  value | Object | Required |  | prop
  The value to read (when rendering) or update (when the form is submitted).

- - ### Constructor Summary

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

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `String` | `getClientId()` |
    `String` | `getControlName()` |

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

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

- - ### Constructor Detail

    - #### Hidden

          public Hidden()

  - ### Method Detail

    - #### getClientId

          public String getClientId()

      Specified by:
        `getClientId` in interface `ClientElement`
      Returns:
        a unique id for the element. This value will be unique for any given rendering of a page. This value is intended for use as the id attribute of the client-side element, and will be used with any DHTML/Ajax related JavaScript.

    - #### getControlName

          public String getControlName()