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