react-hook-mathjax
v2.0.5
Published
Lightweight package using MathJax to allow inline rendering of latex as svg elements
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React Hook MathJax
Lightweight, strongly typed package with almost no dependencies. It uses MathJax v3 and React Hooks to allow inline conversion of a LaTeX string into an svg. For more details, take a look at the example project (which parses user input and handles error states) or the live demo of the example project.
Install
yarn add react-hook-mathjax
Usage
Basic inline display
import React from "react";
import Tex2SVG from "react-hook-mathjax";
function App() {
return (
<div className="App">
<header className="App-header">
<Tex2SVG display="inline" latex="e^{i \pi} + 1 = 0" />
</header>
</div>
);
}
export default App;
Customizing MathJax options
import React from "react";
import Tex2SVG, { MathJaxProvider } from "react-hook-mathjax";
// This object contains the default options, more info at:
// http://docs.mathjax.org/en/latest/options/output/svg.html
const mathJaxOptions = {
svg: {
scale: 1, // global scaling factor for all expressions
minScale: .5, // smallest scaling factor to use
mtextInheritFont: false, // true to make mtext elements use surrounding font
merrorInheritFont: true, // true to make merror text use surrounding font
mathmlSpacing: false, // true for MathML spacing rules, false for TeX rules
skipAttributes: {}, // RFDa and other attributes NOT to copy to the output
exFactor: .5, // default size of ex in em units
displayAlign: 'center', // default for indentalign when set to 'auto'
displayIndent: '0', // default for indentshift when set to 'auto'
fontCache: 'local', // or 'global' or 'none'
localID: null, // ID to use for local font cache (for single equation processing)
internalSpeechTitles: true, // insert <title> tags with speech content
titleID: 0 // initial id number to use for aria-labeledby titles
}
}
function App() {
return (
<MathJaxProvider options={mathJaxOptions}>
<div className="App">
<header className="App-header">
<Tex2SVG display="inline" latex="e^{i \pi} + 1 = 0" />
</header>
</div>
</MathJaxProvider>
);
}
export default App;
Parsing user input
import React from "react";
import Tex2SVG from "react-hook-mathjax";
function App() {
const [inputValue, setInputValue] = React.useState(
"G_{\\mu\\nu} + \\Lambda g_{\\mu\\nu} = \\kappa T_{\\mu\\nu}",
);
return (
<div className="App">
<header className="App-header">
<h3>React Hook MathJax</h3>
<input
type="text"
defaultValue={inputValue}
onChange={e => setInputValue(e.target.value)}
/>
<div className="tex-container">
<Tex2SVG class="tex" tabindex={-1} latex={inputValue} />
</div>
</header>
</div>
);
}
export default App;
Handling error states
import React from "react";
import Tex2SVG from "react-hook-mathjax";
const getErrorFromHTML = (html) =>
html.children[1].firstChild.firstChild.attributes["data-mjx-error"].value;
function App() {
const [inputValue, setInputValue] = React.useState(
"G_{\\mu\\nu} + \\Lambda g_{\\mu\\nu} = \\kappa T_{\\mu\\nu}",
);
const [lastValidInput, setLastValidInput] = React.useState("");
const [error, setError] = React.useState(null);
const hasError = error !== null;
return (
<div className="App">
<header className="App-header">
<h3>React Hook MathJax</h3>
<input
className={`${hasError ? "error" : ""}`}
type="text"
defaultValue={inputValue}
onChange={e => {
setInputValue(e.target.value);
setError(null);
}}
/>
<div className="tex-container">
<Tex2SVG
class="tex"
tabindex={-1}
latex={hasError ? lastValidInput : inputValue}
onSuccess={() =>
setLastValidInput(hasError ? lastValidInput : inputValue)
}
onError={html => setError(getErrorFromHTML(html))}
/>
</div>
{hasError && <div>hint: {error}</div>}
</header>
</div>
);
}
export default App;
API
MathJaxProvider
props:
options
Object, optional
- Sets MathJax configuration.
- Default: Official MathJax configuration
Tex2SVG
props:
latex
string, required
- The string which is passed to MathJax for conversion. Must be valid ![LaTeX](https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/LaTeX_logo.svg/800px-LaTeX_logo.svg.png =50x) in order for a successful conversion into an
svg
- Default:
''
onSuccess
(HTMLElement) => void, optional
- Triggered after a successful conversion of LaTeX string into an
svg
- it receives the html object generated by MathJax - Default:
(html: HTMLElement) => {}
onError
(HTMLElement) => void, optional
- Triggered after a failed conversion of LaTeX string into an
svg
- it receives the html object generated by MathJax - Default:
(html: HTMLElement) => {}
Other html attributes
{[key: string]: any} optional
- All other props passed into this component will be directly translated onto the DOM node
- This allows you to add css classes or other handlers, see usage examples above
- NOTE: this does not attach to the virtual DOM, so pass
class
- notclassName
etc
Acknowledgements
- Big high five to Wing-Hong Andrew Ko (@wko27) for his work on the original react-mathjax package.