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| Base Templates and Blocks | The base and block constructs allow you to define the outer shell of your master templates (i.e., the chrome of the page). |
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The block keyword allows you to define the outer shell of your pages' one or more master template(s) and then fill in or override portions as necessary.
{{< youtube QVOMCYitLEc >}}
Base Template Lookup Order
The base template lookup order closely follows that of the template it applies to (e.g. _default/list.html).
See Template Lookup Order for details and examples.
Define the Base Template
The following defines a simple base template at _default/baseof.html. As a default template, it is the shell from which all your pages will be rendered unless you specify another *baseof.html closer to the beginning of the lookup order.
{{< code file="layouts/_default/baseof.html" >}}
<html> <head> </head> {{ block "main" . }} {{ end }} {{ block "footer" . }} {{ end }} </html> {{< /code >}}Override the Base Template
From the above base template, you can define a default list template. The default list template will inherit all of the code defined above and can then implement its own "main" block from:
{{< code file="layouts/_default/list.html" >}} {{ define "main" }}
Posts
{{ range .Pages }}{{ .Title }}
{{ .Content }}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.
{{% note %}} Code that you put outside the block definitions can break your layout. This even includes HTML comments. For example:
<!-- Seemingly harmless HTML comment..that will break your layout at build -->
{{ define "main" }}
...your code here
{{ end }}
See this thread from the Hugo discussion forums. {{% /note %}}
The following shows how you can override both the "main" and "title" block areas from the base template with code unique to your default single page template:
{{< code file="layouts/_default/single.html" >}} {{ define "title" }}
{{ .Title }} – {{ .Site.Title }} {{ end }} {{ define "main" }}