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50 lines
1.8 KiB
Markdown
50 lines
1.8 KiB
Markdown
---
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title: Ordinal
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description: Returns the zero-based ordinal of the shortcode in relation to its parent.
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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: int
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signatures: [SHORTCODE.Ordinal]
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---
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The `Ordinal` method returns the zero-based ordinal of the shortcode in relation to its parent. If the parent is the page itself, the ordinal represents the position of this shortcode in the page content.
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This method is useful for, among other things, assigning unique element IDs when a shortcode is called two or more times from the same page. For example:
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{{< code file=content/about.md lang=md >}}
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{{</* img src="images/a.jpg" */>}}
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{{</* img src="images/b.jpg" */>}}
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{{< /code >}}
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This shortcode performs error checking, then renders an HTML `img` element with a unique `id` attribute:
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{{< code file=layouts/shortcodes/img.html >}}
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{{ $src := "" }}
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{{ with .Get "src" }}
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{{ $src = . }}
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{{ with resources.Get $src }}
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{{ $id := printf "img-%03d" $.Ordinal }}
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<img id="{{ $id }}" src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
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{{ else }}
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{{ errorf "The %q shortcode was unable to find %s. See %s" $.Name $src $.Position }}
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{{ end }}
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{{ else }}
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{{ errorf "The %q shortcode requires a 'src' parameter. See %s" .Name .Position }}
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{{ end }}
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{{< /code >}}
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Hugo renders the page to:
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```html
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<img id="img-000" src="/images/a.jpg" width="600" height="400" alt="">
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<img id="img-001" src="/images/b.jpg" width="600" height="400" alt="">
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```
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{{% note %}}
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In the shortcode template above, the [`with`] statement is used to create conditional blocks. Remember that the `with` statement binds context (the dot) to its expression. Inside of a `with` block, preface shortcode method calls with a `$` to access the top level context passed into the template.
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[`with`]: /functions/go-template/with
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{{% /note %}}
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