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****************************
The MathJax.ElementJax Class
****************************
The element jax is the bridge between the input and output jax, and
contains the data produced by the input jax needed by the output jax
to display the results. It is tied to the individual ``<script>`` tag
that produced it, and is the object used by JavaScript programs to
interact with the mathematics on the page.
An element jax is stored in the ``jax.js`` file in a subdirectory of
the ``jax/element`` directory, with the subdirectory name being the
name of the element jax. Currently, there is only one element jax
class, the `mml` element jax, and it is stored in ``jax/element/mml``.
The `MathJax.ElementJax` class is a subclass of the :ref:`MathJax Jax
<api-jax>` class, and inherits the properties and methods of that
class. Those listed below are the additional or overridden ones from
that class.
Class Properties
================
.. describe:: id
The name of the jax.
.. describe:: version
The version number of the jax.
.. describe:: directory
The directory where the jax files are stored (e.g., ``"[MathJax]/jax/element/mml"``).
Instance Properties
===================
.. describe:: inputJax
The name of the input jax that created the element.
.. describe:: outputJax
The name of the output jax that has processed this element.
.. describe:: inputID
The DOM `id` of the ``<script>`` tag that generated this element
(if it doesn't have one initially, the MathJax hub will supply
one). Note that this is not a reference to the element itself;
that element will have a reference to this element jax, and if
`inputID` were a reference back, that would cause a reference
loop, which some browsers would not free properly during trash
collection, thus causing a memory leak.
.. describe:: originalText
A string indicating the original input text that was processed for
this element. (In the future, this may be managed by the input jax
rather than ``MathJax.Hub``.)
.. describe:: mimeType
The MIME-type of the element jax (`jax/mml` in the case of an
`mml` element jax).
Other data specific to the element jax subclass may also appear here.
Methods
=======
.. Method:: Text(text[,callback])
Sets the input text for this element to the given text and
reprocesses the mathematics. (I.e., updates the equation to the
new one given by `text`). When the processing is complete, the
`callback`, if any, is called.
:Parameters:
- **text** --- the new mathematics source string for the element
- **callback** --- the callback specification
:Returns: the callback object
.. Method:: Rerender([callback])
:noindex:
Removes the output and produces it again (for example, if CSS has
changed that would alter the spacing of the mathematics). Note
that the internal representation isn't regenerated; only the
output is. The `callback`, if any, is called when the process
completes.
:Parameters:
- **callback** --- the callback specification
:Returns: the callback object
.. Method:: Reprocess([callback])
:noindex:
Removes the output and then retranslates the input into the
internal form and reredners the output again. The `callback`, if
any, is called when the process completes.
:Parameters:
- **callback** --- the callback specification
:Returns: the callback object
.. Method:: Remove()
:noindex:
Removes the output for this element from the web page (but does
not remove the original ``<script>``). The ``<script>`` will be
considered unprocessed, and the next call to
:meth:`MathJax.hub.Typeset()` will re-display it.
:Returns: ``null``
.. Method:: SourceElement()
Returns a reference to the original ``<script>`` DOM element
associated to this element jax.
:Returns: the ``<script>`` element
.. Method:: needsUpdate()
Indicates whether the mathematics has changed so that its output
needs to be updated.
:Returns: ``true`` if the mathematics needs to be reprocessed,
``false`` otherwise
Output jax may add new methods to the base element jax class to
perform exporting to other formats. For example, a MathML output jax
could add ``toMathML()``, or an accessibility output jax could add
``toAudible()``. These could be made available via the MathJax
contextual menu.
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