nikoladev/react-katex

Display math in TeX with KaTeX and ReactJS

react-katex

Display math with KaTeX and ReactJS!

Installing

You can install it with npm:

  $ npm install --save react-katex

With Yarn:

  $ yarn add react-katex

Or use one of the files inside the dist folder.

When using react-katex directly from the browser, react-katex will export a global called ReactKaTeX. Notice that the T and X from "KaTeX" are uppercased.

Don't forget to import KaTeX CSS file (see example/index.html).

If you open the example file on Firefox directly (i.e. without a server) the fonts won't load, open it on Chrome or put it on some server. You can use some static one-liner.

Usage

react-katex has two types of math components, InlineMath and BlockMath.

InlineMath

Display math in the middle of the text.

  var InlineMath = ReactKaTeX.InlineMath;

  ReactDOM.render(<InlineMath math="\\int_0^\\infty x^2 dx"/>,
                document.getElementById('math'));

  // or

  ReactDOM.render(<InlineMath>\int_0^\infty x^2 dx</InlineMath>,
                document.getElementById('math'));

It will be rendered like this:

BlockMath

Display math in a separated block, with larger font and symbols.

  var BlockMath = ReactKaTeX.BlockMath;

  ReactDOM.render(<BlockMath math="\\int_0^\\infty x^2 dx"/>,
                document.getElementById('math'));

  // or

  ReactDOM.render(<BlockMath>\int_0^\infty x^2 dx</BlockMath>,
                document.getElementById('math'));

It will be rendered like this:

Error handling

It's possible to handle parse errors using the prop renderError. This prop must be a function that receives the error object and returns what should be rendered when parsing fails:

var BlockMath = ReactKaTeX.BlockMath;

ReactDOM.render(
  <BlockMath
    math="\\int_{"
    renderError={(error) => {
      return <b>Fail: {error.name}</b>
    }}
  />,
  document.getElementById('math'));

// The code above will render '<b>Fail: ParseError</b>' because it's the value returned from `renderError`.