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48 lines
1.4 KiB
Markdown
48 lines
1.4 KiB
Markdown
---
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title: Param
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description: Returns a page parameter with the given key, falling back to a site parameter if present.
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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: any
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signatures: [PAGE.Param KEY]
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aliases: [/functions/param]
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---
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The `Param` method on a `Page` object looks for the given `KEY` in page parameters, and returns the corresponding value. If it cannot find the `KEY` in page parameters, it looks for the `KEY` in site parameters. If it cannot find the `KEY` in either location, the `Param` method returns `nil`.
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Site and theme developers commonly set parameters at the site level, allowing content authors to override those parameters at the page level.
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For example, to show a table of contents on every page, but allow authors to hide the table of contents as needed:
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Configuration:
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{{< code-toggle file=hugo >}}
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[params]
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display_toc = true
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{{< /code-toggle >}}
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Content:
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{{< code-toggle file=content/example.md fm=true >}}
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title = 'Example'
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date = 2023-01-01
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draft = false
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[params]
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display_toc = false
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{{< /code-toggle >}}
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Template:
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```go-html-template
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{{ if .Param "display_toc" }}
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{{ .TableOfContents }}
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{{ end }}
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```
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The `Param` method returns the value associated with the given `KEY`, regardless of whether the value is truthy or falsy. If you need to ignore falsy values, use this construct instead:
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```go-html-template
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{{ or .Params.foo site.Params.foo }}
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```
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