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113 lines
3.3 KiB
Markdown
113 lines
3.3 KiB
Markdown
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---
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title: transform.ToMath
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description: Renders a math expression using KaTeX.
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categories: []
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keywords: []
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action:
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aliases: []
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related:
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- content-management/mathematics
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returnType: types.Result[template.HTML]
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signatures: ['transform.ToMath EXPRESSION [OPTIONS]']
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aliases: [/functions/tomath]
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toc: true
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---
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{{< new-in "0.132.0" >}}
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{{% note %}}
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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.
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{{% /note %}}
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## Arguments
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EXPRESSION
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: The math expression to render using KaTeX.
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OPTIONS
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: A map of zero or more options.
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## Options
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These are a subset of the [KaTeX options].
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output
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: (`string`). Determines the markup language of the output. One of `html`, `mathml`, or `htmlAndMathml`. Default is `mathml`.
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<!-- Indent to prevent spliting the description list. -->
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With `html` and `htmlAndMathml` you must include KaTeX CSS within the `head` element of your base template. For example:
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```html
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<head>
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...
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.11/dist/katex.min.css" integrity="sha384-nB0miv6/jRmo5UMMR1wu3Gz6NLsoTkbqJghGIsx//Rlm+ZU03BU6SQNC66uf4l5+" crossorigin="anonymous">
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...
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</head>
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```
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displayMode
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: (`bool`) If `true` render in display mode, else render in inline mode. Default is `false`.
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leqno
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: (`bool`) If `true` render with the equation numbers on the left. Default is `false`.
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fleqn
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: (`bool`) If `true` render flush left with a 2em left margin. Default is `false`.
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minRuleThickness
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: (`float`) The minimum thickness of the fraction lines in `em`. Default is `0.04`.
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macros
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: (`map`) A map of macros to be used in the math expression. Default is `{}`.
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throwOnError
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: (`bool`) If `true` throw a `ParseError` when KaTeX encounters an unsupported command or invalid LaTex. See [error handling]. Default is `true`.
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errorColor
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: (`string`) The color of the error messages expressed as an RGB [hexadecimal color]. Default is `#cc0000`.
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## Examples
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### Basic
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```go-html-template
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{{ transform.ToMath "c = \\pm\\sqrt{a^2 + b^2}" }}
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```
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### Macros
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```go-html-template
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{{ $macros := dict
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"\\addBar" "\\bar{#1}"
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"\\bold" "\\mathbf{#1}"
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}}
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{{ $opts := dict "macros" $macros }}
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{{ transform.ToMath "\\addBar{y} + \\bold{H}" $opts }}
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```
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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.
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1. Handle the error in your template. See the render hook example below.
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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 >}}
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{{ with transform.ToMath .Inner }}
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{{ with .Err }}
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{{ errorf "Failed to render KaTeX: %q. See %s" . $.Position }}
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{{ else }}
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{{ . }}
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{{ end }}
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{{ end }}
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{{- /* chomp trailing newline */ -}}
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{{< /code >}}
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[error handling]: #error-handling
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[KaTeX options]: https://katex.org/docs/options.html
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[hexadecimal color]: https://developer.mozilla.org/en-US/docs/Web/CSS/hex-color
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