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101 lines
4 KiB
Markdown
101 lines
4 KiB
Markdown
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---
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title: Links and Cross References
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description: Shortcodes for creating links to documents.
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date: 2017-02-01
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publishdate: 2017-02-01
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lastmod: 2017-03-31
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categories: [content management]
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keywords: ["cross references","references", "anchors", "urls"]
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menu:
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docs:
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parent: "content-management"
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weight: 100
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weight: 100 #rem
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aliases: [/extras/crossreferences/]
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toc: true
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---
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The `ref` and `relref` shortcode resolves the absolute or relative permalink given a path to a document.
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## Use `ref` and `relref`
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```go-html-template
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{{</* ref "document.md" */>}}
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{{</* ref "#anchor" */>}}
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{{</* ref "document.md#anchor" */>}}
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{{</* ref "/blog/my-post" */>}}
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{{</* ref "/blog/my-post.md" */>}}
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{{</* relref "document.md" */>}}
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{{</* relref "#anchor" */>}}
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{{</* relref "document.md#anchor" */>}}
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```
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The single parameter to `ref` is a string with a content `documentname` (e.g., `about.md`) with or without an appended in-document `anchor` (`#who`) without spaces. Hugo is flexible in how we search for documents, so the file suffix may be omitted.
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**Paths without a leading `/` will first be tried resolved relative to the current page.**
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You will get an error if your document could not be uniquely resolved. The error behaviour can be configured, see below.
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### Link to another language version
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Link to another language version of a document, you need to use this syntax:
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```go-html-template
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{{</* relref path="document.md" lang="ja" */>}}
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```
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### Get another Output Format
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To link to a given Output Format of a document, you can use this syntax:
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```go-html-template
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{{</* relref path="document.md" outputFormat="rss" */>}}
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```
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### Anchors
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When an `anchor` is provided by itself, the current page’s unique identifier will be appended; when an `anchor` is provided appended to `documentname`, the found page's unique identifier will be appended:
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```go-html-template
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{{</* relref "#anchors" */>}} => #anchors:9decaf7
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```
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The above examples render as follows for this very page as well as a reference to the "Content" heading in the Hugo docs features pageyoursite
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```go-html-template
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{{</* relref "#who" */>}} => #who:9decaf7
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{{</* relref "/blog/post.md#who" */>}} => /blog/post/#who:badcafe
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```
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More information about document unique identifiers and headings can be found [below]({{< ref "#hugo-heading-anchors" >}}).
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## Hugo Heading Anchors
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When using Markdown document types, Hugo generates heading anchors automatically. The generated anchor for this section is `hugo-heading-anchors`. Because the heading anchors are generated automatically, Hugo takes some effort to ensure that heading anchors are unique both inside a document and across the entire site.
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Ensuring heading uniqueness across the site is accomplished with a unique identifier for each document based on its path. Unless a document is renamed or moved between sections *in the filesystem*, the unique identifier for the document will not change: `blog/post.md` will always have a unique identifier of `81df004c333b392d34a49fd3a91ba720`.
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`ref` and `relref` were added so you can make these reference links without having to know the document’s unique identifier. (The links in document tables of contents are automatically up-to-date with this value.)
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```
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{{</* relref "content-management/cross-references.md#hugo-heading-anchors" */>}}
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/content-management/cross-references/#hugo-heading-anchors:77cd9ea530577debf4ce0f28c8dca242
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```
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## Ref and RelRef Configuration
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The behaviour can, since Hugo 0.45, be configured in `config.toml`:
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refLinksErrorLevel ("ERROR")
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: When using `ref` or `relref` to resolve page links and a link cannot resolved, it will be logged with this log level. Valid values are `ERROR` (default) or `WARNING`. Any `ERROR` will fail the build (`exit -1`).
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refLinksNotFoundURL
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: URL to be used as a placeholder when a page reference cannot be found in `ref` or `relref`. Is used as-is.
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[lists]: /templates/lists/
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[output formats]: /templates/output-formats/
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[shortcode]: /content-management/shortcodes/
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[bfext]: /content-management/formats/#blackfriday-extensions
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