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96 lines
3.3 KiB
Markdown
96 lines
3.3 KiB
Markdown
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---
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title: templates.Defer
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description: Defer execution of a template until after all sites and output formats have been rendered.
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categories: []
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keywords: []
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toc: true
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action:
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aliases: []
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related: []
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returnType: string
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signatures: [templates.Defer OPTIONS]
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aliases: [/functions/templates.defer]
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---
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{{< new-in "0.128.0" >}}
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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:
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```go-html-template
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{{ with (templates.Defer (dict "key" "global")) }}
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{{ $t := debug.Timer "tailwindcss" }}
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{{ with resources.Get "css/styles.css" }}
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{{ $opts := dict
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"inlineImports" true
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"optimize" hugo.IsProduction
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}}
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{{ with . | css.TailwindCSS $opts }}
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{{ if hugo.IsDevelopment }}
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<link rel="stylesheet" href="{{ .RelPermalink }}" />
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{{ else }}
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{{ with . | minify | fingerprint }}
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<link
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rel="stylesheet"
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href="{{ .RelPermalink }}"
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integrity="{{ .Data.Integrity }}"
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crossorigin="anonymous" />
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{{ end }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ $t.Stop }}
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{{ end }}
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```
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{{% note %}}
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This function only works in combination with the `with` keyword.
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{{% /note %}}
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{{% note %}}
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Variables defined on the outside are not visible on the inside and vice versa. To pass in data, use the `data` [option](#options).
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{{% /note %}}
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For the above to work well when running the server (or `hugo -w`), you want to have a configuration similar to this:
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{{< code-toggle file=hugo >}}
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[module]
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[[module.mounts]]
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source = "hugo_stats.json"
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target = "assets/notwatching/hugo_stats.json"
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disableWatch = true
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[build.buildStats]
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enable = true
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[[build.cachebusters]]
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source = "assets/notwatching/hugo_stats\\.json"
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target = "styles\\.css"
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[[build.cachebusters]]
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source = "(postcss|tailwind)\\.config\\.js"
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target = "css"
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{{< /code-toggle >}}
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## Options
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The `templates.Defer` function takes a single argument, a map with the following optional keys:
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key (`string`)
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: 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.
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data (`map`)
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: Optional map to pass as data to the deferred template. This will be available in the deferred template as `.` or `$`.
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```go-html-template
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Language Outside: {{ site.Language.Lang }}
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Page Outside: {{ .RelPermalink }}
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I18n Outside: {{ i18n "hello" }}
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{{ $data := (dict "page" . )}}
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{{ with (templates.Defer (dict "data" $data )) }}
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Language Inside: {{ site.Language.Lang }}
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Page Inside: {{ .page.RelPermalink }}
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I18n Inside: {{ i18n "hello" }}
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{{ end }}
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```
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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.
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