mathjax-node 

This repository contains a library that provides an API to call MathJax from Node.js programs. The API converts individual math expressions (in any of MathJax's input formats) into HTML (with CSS), SVG or MathML code.

Use

``
npm install mathjax-node
`

to install mathjax-node and its dependencies.

Note:

mathjax-node requires Node.js v4 or later.

Breaking Changes in v1.0:


mathjax-node v1.0 makes breaking changes to the following features from the pre-releases.

- [CHANGED] lib/mj-single.js has been renamed to lib/main.js (and set as main in package.json, i.e., require('mathjax-node') will load it.
- [REMOVED] lib/mj-page.js (API for processing HTML-fragments) and related CLI tools
- [REMOVED] speech-rule-engine integration
- [REMOVED] PNG generation
- [REMOVED] CLI tools in bin/

These features can easily be recreated in separate modules for greater flexibility. For examples, see

- mathjax-node-cli
- mathjax-node-page
- mathjax-node-sre
- mathjax-node-svg2png

Be sure to also check out other projects on NPM that depend on mathjax-node.

Getting started

mathjax-node provides a library, ./lib/main.js. Below is a very minimal example for using it - the tests and the examples mentioned above provide more advanced examples.

`javascript
// a simple TeX-input example
var mjAPI = require("mathjax-node");
mjAPI.config({
MathJax: {
// traditional MathJax configuration
}
});
mjAPI.start();

var yourMath = 'E = mc^2';

mjAPI.typeset({
math: yourMath,
format: "TeX", // "inline-TeX", "MathML"
mml:true, // svg:true,
}, function (data) {
if (!data.errors) {console.log(data.mml)}
// will produce:
// $$$$
// E
// =
// m
//
// c
// 2
//
//
});
`

Documentation

mathjax-node exports three methods, config, start, typeset.

$3

The config method is used to set _global_ configuration options. Its default options are

`javascript
{
displayMessages: false, // determines whether Message.Set() calls are logged
displayErrors: true, // determines whether error messages are shown on the console
undefinedCharError: false, // determines whether "unknown characters" (i.e., no glyph in the configured fonts) are saved in the error array
extensions: '', // a convenience option to add MathJax extensions
fontURL: 'https://cdn.mathjax.org/mathjax/latest/fonts/HTML-CSS', // for webfont urls in the CSS for HTML output
MathJax: { } // standard MathJax configuration options, see https://docs.mathjax.org for more detail.
}
`

Note. Changes to these options require a restart of the API using the start() method (see below).

$3

The start method start (and restarts) mathjax-node. This allows reconfiguration.

Note. This is done automatically when typeset is first called (see below).

$3

The typeset method is the main method of mathjax-node. It expects a configuration object input and a callback.

Once called, typeset can be called repeatedly and will optionally store information across calls (see state below).

The following are the default input options.

`javascript
{
ex: 6, // ex-size in pixels
width: 100, // width of container (in ex) for linebreaking and tags
useFontCache: true, // use and in svg output?
useGlobalCache: false, // use common for all equations?
linebreaks: false, // automatic linebreaking
equationNumbers: "none", // automatic equation numbering ("none", "AMS" or "all")

math: "", // the math string to typeset
format: "TeX", // the input format (TeX, inline-TeX, AsciiMath, or MathML)
xmlns: "mml", // the namespace to use for MathML

html: false, // generate HTML output
htmlNode: false, // generate HTML output as jsdom node
css: false, // generate CSS for HTML output
mml: false, // generate MathML output
mmlNode: false, // generate MathML output as jsdom node
svg: false, // generate SVG output
svgNode: false, // generate SVG output as jsdom node

speakText: true, // add textual alternative (for TeX/asciimath the input string, for MathML a dummy string)

state: {}, // an object to store information from multiple calls (e.g., if useGlobalCache, counter for equation numbering if equationNumbers ar )
timeout: 10 * 1000, // 10 second timeout before restarting MathJax
}
`

$3

mathjax-node returns two objects to the callback: a result object as well as the original input options.

The result object will contain (at most) the following structure:

`javascript
{
mml: // a string of MathML markup if requested
mmlNode: // a jsdom node of MathML markup if requested
html: // a string of HTML markup if requested
htmlNode: // a jsdom node of HTML markup if requested
css: // a string of CSS if HTML was requested
svg: // a string of SVG markup if requested
svgNode: // a jsdom node of SVG markup if requested
style: // a string of CSS inline style if SVG requested
speakText: // a string of speech text if requested

state: { // the state object (if useGlobalCache or equationNumbers is set)
glyphs: // a collection of glyph data
defs : // a string containing SVG def elements
AMS: {
startNumber: // the current starting equation number
labels: // the set of labels
IDs: // IDs used in previous equations
}
}
}
`

The options contains the configuration object passed to typeset; this can be useful for passing other data along or for identifying which typeset() call is associated with this callback call (in case you use the same callback function for more than one typeset()`).