react-katex-yingqi

> Display math expressions with KaTeX and React

Installation

``sh
$ npm install react-katex-yingqi
# or
$ yarn add react-katex-yingqi
`

Usage

`jsx
import 'katex/dist/katex.min.css';
import { InlineMath, BlockMath } from 'react-katex-yingqi';
`

$3

Display math in the middle of the text.

`jsx
var InlineMath = ReactKaTeX.InlineMath;

ReactDOM.render(,
document.getElementById('math'));

// or

ReactDOM.render(\int_0^\infty x^2 dx,
document.getElementById('math'));
`

It will be rendered like this:

!Inline math

$3

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

`jsx
var BlockMath = ReactKaTeX.BlockMath;

ReactDOM.render(,
document.getElementById('math'));

// or

ReactDOM.render(\int_0^\infty x^2 dx,
document.getElementById('math'));
`

It will be rendered like this:

!Block math


Note:

Don't forget to import KaTeX CSS file.
`jsx
import 'katex/dist/katex.min.css';
`

$3

#### Default error message

By default the error rendering is handled by KaTeX. You can optionally pass errorColor (defaults to #cc0000) as a prop:

`jsx
var BlockMath = ReactKaTeX.BlockMath;

ReactDOM.render(
math={'\\int_0^\\infty x^2 dx \\inta'}
errorColor={'#cc0000'}
/>, document.getElementById('math'));
`

This will be rendered like so:

!KaTeX error

#### Custom error message

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:

`jsx
var BlockMath = ReactKaTeX.BlockMath;

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

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

This will render Fail: ParseError:

!renderError

$3

In addition to using the math property, you can also quote as a child allowing the use of { } in your expression.

`jsx
ReactDOM.render({"\\frac{\\text{m}}{\\text{s}^2}"},
document.getElementById('math'));
`

Or Multiline

`jsx
ReactDOM.render({\\frac{\\text{m}}
{\\text{s}^2}},
document.getElementById('math'));
`

However, it can be annoying to escape backslashes. This can be circumvented with the String.raw tag on a template literal when using ES6.

`jsx
ReactDOM.render({String.raw\frac{\text{m}}{\text{s}^2}},
document.getElementById('math'));
`

Backticks must be escaped with a backslash but would be passed to KaTeX as \\\. A tag can be created to replace \\\ with \

``jsx
const latex = (...a) => String.raw(...a).replace("\\","")
ReactDOM.render({latex\`},
document.getElementById('math'));
`

You can even do variable substitution

`jsx
const top = "m";
const bottom = "s";
ReactDOM.render({String.raw\frac{\text{${top}}}{\text{${bottom}}^2}},
document.getElementById('math'));
``