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hugo/docs/content/en/methods/page/HasShortcode.md

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HasShortcode Reports whether the given shortcode is called by the given page.
functions_and_methods
returnType signatures
bool
PAGE.HasShortcode NAME

By example, let's use Plotly to render a chart:

{{</* plotly */>}}
{
  "data": [
    {
      "x": ["giraffes", "orangutans", "monkeys"],
      "y": [20, 14, 23],
      "type": "bar"
    }
  ],
}
{{</* /plotly */>}}

The shortcode is simple:

{{ $id := printf "plotly-%02d" .Ordinal }}
<div id="{{ $id }}"></div>
<script>
  Plotly.newPlot(document.getElementById({{ $id }}), {{ .Inner | safeJS }});
</script>

Now we can selectively load the required JavaScript on pages that call the "plotly" shortcode:

<head>
  ...
  {{ if .HasShortcode "plotly" }}
    <script src="https://cdn.plot.ly/plotly-2.28.0.min.js"></script>
  {{ end }}
  ...
</head>