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--- | ||
title: transform.ToMath | ||
description: Renders a math expression using KaTeX. | ||
categories: [] | ||
keywords: [] | ||
action: | ||
aliases: [] | ||
related: | ||
- content-management/mathematics | ||
returnType: template.HTML | ||
signatures: ['transform.ToMath EXPRESSION [OPTIONS]'] | ||
aliases: [/functions/tomath] | ||
toc: true | ||
--- | ||
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{{< new-in "0.132.0" >}} | ||
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{{% note %}} | ||
This feature was introduced in Hugo 0.132.0 and is marked as experimental. | ||
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This does not mean that it's going to be removed, but this is our first use of WASI/Wasm in Hugo, and we need to see how it [works in the wild](https://github.com/gohugoio/hugo/issues/12736) before we can set it in stone. | ||
{{% /note %}} | ||
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## Arguments | ||
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EXPRESSION | ||
: The math expression to render using KaTeX. | ||
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OPTIONS | ||
: A map of zero or more [options]. | ||
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## Options | ||
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These are a sub set of the [KaTeX options]. | ||
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output | ||
: String. Default is `mathml`.\ | ||
`html` Outputs HTML only.\ | ||
`mathml`: Outputs MathML only.\ | ||
`htmlAndMathml`: Outputs HTML for visual rendering and MathML for accessibility. | ||
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displayMode | ||
: Boolean. Default is `false`.\ | ||
If `true` the math will be rendered in display mode. If false the math will be rendered in `inline` mode. | ||
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leqno | ||
: Boolean. Default is `false`.\ | ||
If `true` the math will be rendered with the equation numbers on the left. | ||
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fleqn | ||
: Boolean. Default is `false`.\ | ||
If `true`, render flush left with a 2em left margin. | ||
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minRuleThickness | ||
: Float. Default is `0.04`.\ | ||
The minimum thickness of the fraction lines in `em`. | ||
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macros | ||
: Map. Default is `{}`.\ | ||
A map of macros to be used in the math expression. | ||
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throwOnError | ||
: Boolean. Default is `true`.\ | ||
If `true`, KaTeX will throw a `ParseError` when it encounters an unsupported command or invalid LaTex. See [error handling]. | ||
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errorColor | ||
: String. Default is `#cc0000`.\ | ||
The color of the error messages.\ | ||
A color string given in the format "#XXX" or "#XXXXXX" | ||
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## Examples | ||
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### Basic | ||
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```go-html-template | ||
{{ transform.ToMath "c = \\pm\\sqrt{a^2 + b^2}" }} | ||
``` | ||
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### Macros | ||
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```go-html-template | ||
{{ $macros := dict | ||
"\\addBar" "\\bar{#1}" | ||
"\\bold" "\\mathbf{#1}" | ||
}} | ||
{{ $opts := dict "macros" $macros }} | ||
{{ transform.ToMath "\\addBar{y} + \\bold{H}" $opts }} | ||
``` | ||
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## Error handling | ||
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There are 3 ways to handle errors from KaTeX: | ||
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1. Let KaTeX throw an error and make the build fail. This is the default behavior. | ||
1. Handle the error in your template. See the render hook example below. | ||
1. Set the `throwOnError` option to `false` to make KaTeX render the expression as an error instead of throwing an error. See [options]. | ||
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{{< code file=layouts/_default/_markup/render-passthrough-inline.html copy=true >}} | ||
{{ with transform.ToMath .Inner }} | ||
{{ with .Err }} | ||
{{ errorf "Failed to render KaTeX: %q. See %s" . $.Position }} | ||
{{ else }} | ||
{{ . }} | ||
{{ end }} | ||
{{ end }} | ||
{{- /* chomp trailing newline */ -}} | ||
{{< /code >}} | ||
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[options]: #options | ||
[error handling]: #error-handling | ||
[KaTeX options]: https://katex.org/docs/options.html | ||
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