Ordinal
Syntax
SHORTCODE.Ordinal
Returns
int
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.
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:
content/about.md
{{< img src="images/a.jpg" >}}
{{< img src="images/b.jpg" >}}This shortcode performs error checking, then renders an HTML img element with a unique id attribute:
layouts/shortcodes/img.html
{{ $src := "" }}
{{ with .Get "src" }}
{{ $src = . }}
{{ with resources.Get $src }}
{{ $id := printf "img-%03d" $.Ordinal }}
<img id="{{ $id }}" src="{{ .RelPermalink }}" width="{{ .Width }}" height="{{ .Height }}" alt="">
{{ else }}
{{ errorf "The %q shortcode was unable to find %s. See %s" $.Name $src $.Position }}
{{ end }}
{{ else }}
{{ errorf "The %q shortcode requires a 'src' argument. See %s" .Name .Position }}
{{ end }}Hugo renders the page to:
<img id="img-000" src="/images/a.jpg" width="600" height="400" alt="">
<img id="img-001" src="/images/b.jpg" width="600" height="400" alt="">