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.. _configure-fast-preview:
*****************************
The fast-preview extension
*****************************
The options below control the operation of the `fast-preview`
extension that is run when you include ``"fast-preview.js"`` in the
`extensions` array of your configuration. They are listed with their
default values. To set any of these options, include a
``fast-preview`` section in your :meth:`MathJax.Hub.Config()` call.
For example
.. code-block:: javascript
MathJax.Hub.Config({
"fast-preview": {
Chunks: {EqnChunk: 10000, EqnChunkFactor: 1, EqnChunkDelay: 0},
color: "inherit!important",
updateTime: 30, updateDelay: 6,
messageStyle: "none",
disabled: false
}
});
would ask for the PreviewHTML output to run as a preview (`disabled: false`),
force inheritance of the surrounding text color, and set the `updateTime` and
`updateDelay` to low values (30ms / 6ms) to speed up
the preview pass. Furthermore, it configures the second pass to set the
chunking (`Chunks`) to a reflow every 10,000 equations and disables the
progress messages (`messageStyle`).
This extension provides a two-pass rendering mode. A **first**, fast-but-rough
rendering is genereated as a preview, using the
:ref:`configure-PreviewHTML`, then a **second** pass using the
configured output jax runs to update the preview output.
This two-pass mode will provide the reader with a quick, decent rendering to
start reading immediately, while silently updating that rendering with the
high quality layout later.
.. describe:: EqnChunk: 10000
EqnChunkFactor: 1
EqnChunkDelay: 0
These values control how "chunky" the **second** pass will be. For more
information see :ref:`configure-HTML-CSS` and :ref:`configure-SVG`.
.. describe:: color: "inherit!important"
This value allows you to choose a text color for the **first** passs.
.. describe:: updateTime: 30
updateDelay: 6
These values control how often the **second** pass will pause to allow user
interaction (e.g., scrolling).
.. describe:: messageStyle: "none"
This value controls the verbosity of the processing messages during the
the **second** pass; see :ref:`configure-hub` for more information.
.. describe:: disabled:false
This value enables or disables the preview mode. In particular,
it allows overriding a combined configuration file, cf.
:ref:`common-configurations`. The user can independently enable or disable
the fast preview via the MathJax Menu.
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