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author | Bjørn Erik Pedersen <[email protected]> | 2024-08-09 15:17:43 +0200 |
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committer | Bjørn Erik Pedersen <[email protected]> | 2024-08-09 15:17:43 +0200 |
commit | a6e635ca7d905d9ec3ffd708db2694f680b03aae (patch) | |
tree | 8885b954b6a7426bc5fbf0acb378bf307081f79f /content/en/functions/templates/Defer.md | |
parent | 8b9803425e63e1b1801f8d5d676e96368d706722 (diff) | |
download | hugo-a6e635ca7d905d9ec3ffd708db2694f680b03aae.tar.gz hugo-a6e635ca7d905d9ec3ffd708db2694f680b03aae.zip |
Squashed 'docs/' changes from 9b06f951e..fcc3ed651
fcc3ed651 Remove some expired new-in
a9c5981f5 Fix cascade example
82bb250fa Add some lines about permalinks tokens in front matter
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42d9d1c79 Update image formats from which EXIF data can be extracted
09ad56b6e netlify: Hugo 0.130.0
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e2458074d math: Add trigonometric functions and some angle helper functions
392afc8f9 Disable the showcase section for now
0300750f2 Improve example of image render hook
60a9306af Improve description of the .Site.RegularPages method
8d759175d Fix typos
55daa4554 Update XxHash.md
397c81cb7 Add namespace for hash functions
70fe8d2f0 netlify: Bump Hugo 0.129.0
5a9771aff Merge branch 'tempv0.129.0'
f9146575b Fix typo
e6e1fea49 Fix typo in Hugo docs | functions | partial
732d10ec4 source: Expose GitInfo Body
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3270587e9 Fix typo
727c5396e netlify: Hugo 0.128.1
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027134102 Update GitHub Pages workflow file example
2600a8a2e Miscellaneous edits
3fdd5819b Update Build.md
7764005c3 Improve example of render hook directory structure
5e3941d82 Fix typos
748bf065f Restructure templates section
fafbf6566 Update Defer.md
012162e0d Document changes to template functions in v0.128.0
0990ce35b quick-reference: Update emojis
6677a30ef Update Goldmark configuration documentation
4449d530d Document new pagination config
0af8be439 Update Defer.md
56348196d netlify: Hugo 0.128.0
d67b6d82e Update content/en/functions/templates/Defer.md
23d996b3d Update content/en/functions/templates/Defer.md
7f7fb2f27 Document templates.Defer
5ada1e9d5 Fix docs merge (remove shortcode)
d27ee6156 Merge branch 'tempv0.128.0'
5d7317c84 Fix typo
7c18ee546 Update theme
83bfea63b Update theme
b274b3238 Merge commit '8b9803425e63e1b1801f8d5d676e96368d706722'
ff34a035a deploy: Add stripIndexHtml target option
d9e964bdb markup/goldmark: Add the Hugo Goldmark Extras "delete" extension
ac5bd16d2 deps: Upgrade github.com/alecthomas/chroma v2.13.0 => v2.14.0
25377171b config: Remove extraneous BuildConfig setting
0d2044f6d docs: Regen docshelper
a2548dac9 markup/goldmark: Support extras extension
9d0c86ee8 commands: Add gen chromastyles --lineNumbersTableStyle flag
git-subtree-dir: docs
git-subtree-split: fcc3ed651a1b6431303c2f88f20fa38531c52b3d
Diffstat (limited to 'content/en/functions/templates/Defer.md')
-rw-r--r-- | content/en/functions/templates/Defer.md | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/content/en/functions/templates/Defer.md b/content/en/functions/templates/Defer.md new file mode 100644 index 000000000..a99b955ec --- /dev/null +++ b/content/en/functions/templates/Defer.md @@ -0,0 +1,95 @@ +--- +title: templates.Defer +description: Defer execution of a template until after all sites and output formats have been rendered. +categories: [] +keywords: [] +toc: true +action: + aliases: [] + related: [] + returnType: string + signatures: [templates.Defer OPTIONS] +aliases: [/functions/templates.defer] +--- + +{{< new-in "0.128.0" >}} + +In some rare use cases, you may need to defer the execution of a template until after all sites and output formats have been rendered. One such example could be [TailwindCSS](/functions/css/tailwindcss/) using the output of [hugo_stats.json](/getting-started/configuration/#configure-build) to determine which classes and other HTML identifiers are being used in the final output: + +```go-html-template +{{ with (templates.Defer (dict "key" "global")) }} + {{ $t := debug.Timer "tailwindcss" }} + {{ with resources.Get "css/styles.css" }} + {{ $opts := dict + "inlineImports" true + "optimize" hugo.IsProduction + }} + {{ with . | css.TailwindCSS $opts }} + {{ if hugo.IsDevelopment }} + <link rel="stylesheet" href="{{ .RelPermalink }}" /> + {{ else }} + {{ with . | minify | fingerprint }} + <link + rel="stylesheet" + href="{{ .RelPermalink }}" + integrity="{{ .Data.Integrity }}" + crossorigin="anonymous" /> + {{ end }} + {{ end }} + {{ end }} + {{ end }} + {{ $t.Stop }} +{{ end }} +``` + +{{% note %}} +This function only works in combination with the `with` keyword. +{{% /note %}} + + +{{% note %}} +Variables defined on the outside are not visible on the inside and vice versa. To pass in data, use the `data` [option](#options). +{{% /note %}} + +For the above to work well when running the server (or `hugo -w`), you want to have a configuration similar to this: + +{{< code-toggle file=hugo >}} +[module] +[[module.mounts]] +source = "hugo_stats.json" +target = "assets/notwatching/hugo_stats.json" +disableWatch = true +[build.buildStats] +enable = true +[[build.cachebusters]] +source = "assets/notwatching/hugo_stats\\.json" +target = "styles\\.css" +[[build.cachebusters]] +source = "(postcss|tailwind)\\.config\\.js" +target = "css" +{{< /code-toggle >}} + +## Options + +The `templates.Defer` function takes a single argument, a map with the following optional keys: + +key (`string`) +: The key to use for the deferred template. This will, combined with a hash of the template content, be used as a cache key. If this is not set, Hugo will execute the deferred template on every render. This is not what you want for shared resources like CSS and JavaScript. + +data (`map`) +: Optional map to pass as data to the deferred template. This will be available in the deferred template as `.` or `$`. + + +```go-html-template +Language Outside: {{ site.Language.Lang }} +Page Outside: {{ .RelPermalink }} +I18n Outside: {{ i18n "hello" }} +{{ $data := (dict "page" . )}} +{{ with (templates.Defer (dict "data" $data )) }} + Language Inside: {{ site.Language.Lang }} + Page Inside: {{ .page.RelPermalink }} + I18n Inside: {{ i18n "hello" }} +{{ end }} +``` + +The [Output Format](/templates/output-formats/), [Site](/methods/page/site/), and [language](/methods/site/language) will be the same, even if the execution is deferred. In the example above, this means that the `site.Language.Lang` and `.RelPermalink` will be the same on the inside and the outside of the deferred template. |