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51 lines
1.3 KiB
Markdown
51 lines
1.3 KiB
Markdown
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---
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title: HasShortcode
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description: Reports whether the given shortcode is called by the given page.
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categories: []
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keywords: []
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action:
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related: []
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returnType: bool
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signatures: [PAGE.HasShortcode NAME]
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---
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By example, let's use [MathJax] to render a LaTeX mathematical expression:
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[MathJax]: https://www.mathjax.org/
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{{< code file=contents/physics/lesson-1.md lang=markdown >}}
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Albert Einstein’s theory of special relativity expresses
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the fact that mass and energy are the same physical entity
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and can be changed into each other.
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{{</* math */>}}
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$$
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E=mc^2
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$$
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{{</* /math */>}}
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In the equation, the increased relativistic mass (m) of a
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body times the speed of light squared (c2) is equal to
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the kinetic energy (E) of that body.
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{{< /code >}}
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The shortcode is simple:
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{{< code file=layouts/shortcodes/math.html >}}
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{{ trim .Inner "\r\n" }}
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{{< /code >}}
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Now we can selectively load the required CSS and JavaScript on pages that call the "math" shortcode:
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{{< code file=layouts/baseof.html >}}
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<head>
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...
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{{ if .HasShortcode "math" }}
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<script src="https://polyfill.io/v3/polyfill.min.js?features=es6"></script>
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<script id="MathJax-script" async src="https://cdn.jsdelivr.net/npm/mathjax@3/es5/tex-mml-chtml.js"></script>
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{{ end }}
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...
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</head>
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{{< /code >}}
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