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72 lines
2.2 KiB
Markdown
72 lines
2.2 KiB
Markdown
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---
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date: 2016-03-29T21:26:20-05:00
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menu:
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main:
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parent: layout
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prev: /templates/views/
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next: /templates/partials/
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title: Block Templates
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weight: 80
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---
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Go 1.6 includes a powerful new keyword, `block`. This construct allows you to define the outer shell of your pages in a single "base" template, filling in or overriding portions as necessary.
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## Define the base template
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Let's define a simple base template, a shell from which all our pages will start. To find a base template, Hugo searches the same paths and file names as it does for [Ace templates]({{< relref "templates/ace.md" >}}), just with files suffixed `.html` rather than `.ace`.
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```html
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>{{ block "title" . }}
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<!-- Blocks may include default content. -->
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{{ .Site.Title }}
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{{ end }}</title>
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</head>
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<body>
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<!-- Code that all your templates share, like a header -->
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{{ block "main" . }}
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<!-- The part of the page that begins to differ between templates -->
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{{ end }}
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<!-- More shared code, perhaps a footer -->
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</body>
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</html>
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```
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## Overriding the base
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Your [default list template]({{< relref "templates/list.md" >}}) (`_default/list.html`) will inherit all of the code defined in the base template. It could then implement its own "main" block from the base template above like so:
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```html
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<!-- Note the lack of Go's context "dot" when defining blocks -->
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{{ define "main" }}
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<h1>Posts</h1>
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{{ range .Data.Pages }}
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<article>
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<h2>{{ .Title }}</h2>
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{{ .Content }}
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</article>
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{{ end }}
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{{ end }}
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```
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This replaces the contents of our (basically empty) "main" block with something useful for the list template. In this case, we didn't define a "title" block so the contents from our base template remain unchanged in lists.
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In our [default single template]({{< relref "templates/content.md" >}}) (`_default/single.html`), let's implement both blocks:
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```html
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{{ define "title" }}
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{{ .Title }} – {{ .Site.Title }}
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{{ end }}
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{{ define "main" }}
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<h1>{{ .Title }}</h1>
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{{ .Content }}
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{{ end }}
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```
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This overrides both block areas from the base template with code unique to our single template.
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