Package org.apache.tapestry5.corelib.internal

## Class HiddenFieldPositioner

- java.lang.Object
- - org.apache.tapestry5.corelib.internal.HiddenFieldPositioner

-     public class HiddenFieldPositioner
      extends java.lang.Object

  Used to position a hidden field (as part of a form-related component). Hidden fields are not allowed to go just anywhere, there are rules, dictated by the (X)HTML schema, about where they are allowed. We use the `MarkupWriterListener` interface to monitor elements as they are started and ended to find a place to put content.

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `HiddenFieldPositioner​(MarkupWriter writer, HiddenFieldLocationRules rules)` |

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `discard()` | Discard this positioner (an alternative to invoking `getElement()`).
    `Element` | `getElement()` | Returns the hidden field element, which can have its attributes filled in.

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

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

- - ### Constructor Detail

    - #### HiddenFieldPositioner

          public HiddenFieldPositioner​(MarkupWriter writer,
                                       HiddenFieldLocationRules rules)

  - ### Method Detail

    - #### getElement

          public Element getElement()

      Returns the hidden field element, which can have its attributes filled in.
      Returns:
        the element
      Throws:
        `java.lang.IllegalStateException` - if the element was not positioned

    - #### discard

          public void discard()

      Discard this positioner (an alternative to invoking `getElement()`). If an `Element` has been created for the hidden field, that element is removed.
      Since:
        5.2.0