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# The Base Jax Class

The MathJax.InputJax, MathJax.OutputJax and MathJax.ElementJax classes are all subclasses of the base Jax class in MathJax. This is a private class that implements the methods common to all three other jax classes.

Unlike most MathJax.Object classes, calling the class object creates a subclass of the class, rather than an instance of the class. E.g.,

    MathJax.InputJax.MyInputJax = MathJax.InputJax({
      name: "MyInputJax",
      version: "1.0",
      ...
    });

creates `MathJax.InputJax.MyInputJax` as a subclass of `MathJax.InputJax`.

## Class Properties

`directory`

  The name of the jax directory (usually `"[MathJax]/jax"). Overridden in the subclass to be the specific directory for the class, e.g. ``"[MathJax]/jax/input"`.

`extensionDir`

  The name of the extensions directory (usually `"[MathJax]/extensions"`).

## Instance Properties

`name`

  The name of the jax.

`version`

  The version number of the jax.

`directory`

  The directory for the jax (e.g., `"[MathJax]/jax/input/TeX"`).

`require: null`

  An array of files to load before the `jax.js` file calls the `MathJax.Ajax.loadComplete()` method.

`config: {}`

  An object that contains the default configuration options for the jax. These can be modified by the author by including a configuration subsection for the specific jax in question.

## Methods

`Translate`(script)

  This is the method that the `MathJax.Hub` calls when it needs the input or output jax to process the given math `<script>` call. Its default action is to start loading the jax’s `jax.js` file, and redefine the `Translate()` method to be the `noTranslate()` method below. The `jax.js` file should redefine the `Translate()` method to perform the translation operation for the specific jax. For an input jax, it should return the ElementJax object that it created.

  Parameters : | script — reference to the DOM `<script>` object for the mathematics to be translated
  Returns : | an ElementJax object, or `null`

`noTranslate`(script)

  This is a temporary routine that is used while the `jax.js` file is loading. It throws an error indicating the the `Translate()` method hasn’t been redefined. That way, if the `jax.js` file failes to load for some reason, you will receive an error trying to process mathematics with this input jax.

  Parameters : | script — reference to the DOM `<script>` object for the mathematics to be translated
  Returns : | `null`

`Register`(mimetype)

  This method is overridden in the InputJax, OutputJax and ElementJax subclasses to handle the registration of those classes of jax.

  Parameters : | mimetype — the MIME-type to be associated with the jax
  Returns : | `null`

`Config`()

  Inserts the configuration block for this jax from the author’s configuration specification into the jax’s `config` property. If the configuration includes an `Augment` object, that is used to augment the jax (that is, the configuration can override the methods of the object, as well as the data). This is called automatically during the loading of the `jax.js` file.

`Startup`()

  This is a method that can be overridden in the subclasses to perform initialization at startup time (after the configuration has occurred).

`loadComplete`(file)

  This is called by the `config.js` and `jax.js` files when they are completely loaded and are ready to signal that fact to MathJax. For `config.js`, this simply calls the `MathJax.Ajax.loadComplete()` method for the `config.js` file. For `jax.js`, the actions performed here are the following:

  > 1. Post the “[name] Jax Config” message to the startup signal.
  > 2. Perform the jax’s `Config()` method.
  > 3. Post the “[name] Jax Require” message to the startup signal.
  > 4. Load the files from the jax’s `require` array (which may have been modified during the configuration process).
  > 5. Post the “[name] Jax Startup” message to the startup signal.
  > 6. Perform the jax’s `Startup()` method.
  > 7. Post the “[name] Jax Ready” message to the startup signal.
  > 8. perform the `MathJax.Ajax.loadComplete()` call for the `jax.js` file.

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