range
Syntax
The collection may be a slice, a map, or an integer.
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
{{ . }} → foo bar baz
{{ end }}
Use with the else
statement:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
<p>{{ . }}</p>
{{ else }}
<p>The collection is empty</p>
{{ end }}
Within a range block:
- Use the
continue
statement to stop the innermost iteration and continue to the next iteration - Use the
break
statement to stop the innermost iteration and bypass all remaining iterations
Understanding context
See the context section in the introduction to templating.
For example, at the top of a page template, the context (the dot) is a Page
object. Within the range
block, the context is bound to each successive element.
With this contrived example:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
{{ .Title }}
{{ end }}
Hugo will throw an error:
can't evaluate field Title in type int
The error occurs because we are trying to use the .Title
method on a string instead of a Page
object. Within the range
block, if we want to render the page title, we need to get the context passed into the template.
Use the $
to get the context passed into the template.
This template will render the page title three times:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
{{ $.Title }}
{{ end }}
Gaining a thorough understanding of context is critical for anyone writing template code.
Examples
Slice of scalars
This template code:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
<p>{{ . }}</p>
{{ end }}
Is rendered to:
<p>foo</p>
<p>bar</p>
<p>baz</p>
This template code:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $v := $s }}
<p>{{ $v }}</p>
{{ end }}
Is rendered to:
<p>foo</p>
<p>bar</p>
<p>baz</p>
This template code:
{{ $s := slice "foo" "bar" "baz" }}
{{ range $k, $v := $s }}
<p>{{ $k }}: {{ $v }}</p>
{{ end }}
Is rendered to:
<p>0: foo</p>
<p>1: bar</p>
<p>2: baz</p>
Slice of maps
This template code:
{{ $m := slice
(dict "name" "John" "age" 30)
(dict "name" "Will" "age" 28)
(dict "name" "Joey" "age" 24)
}}
{{ range $m }}
<p>{{ .name }} is {{ .age }}</p>
{{ end }}
Is rendered to:
<p>John is 30</p>
<p>Will is 28</p>
<p>Joey is 24</p>
Slice of pages
This template code:
{{ range where site.RegularPages "Type" "articles" }}
<h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}
Is rendered to:
<h2><a href="/articles/article-3/">Article 3</a></h2>
<h2><a href="/articles/article-2/">Article 2</a></h2>
<h2><a href="/articles/article-1/">Article 1</a></h2>
Maps
This template code:
{{ $m := dict "name" "John" "age" 30 }}
{{ range $k, $v := $m }}
<p>key = {{ $k }} value = {{ $v }}</p>
{{ end }}
Is rendered to:
<p>key = age value = 30</p>
<p>key = name value = John</p>
Unlike ranging over an array or slice, Hugo sorts by key when ranging over a map.
Integers
New in v0.123.0Ranging over a positive integer n
executes the block n
times, with the context starting at zero and incrementing by one in each iteration.
{{ $s := slice }}
{{ range 1 }}
{{ $s = $s | append . }}
{{ end }}
{{ $s }} → [0]
{{ $s := slice }}
{{ range 3 }}
{{ $s = $s | append . }}
{{ end }}
{{ $s }} → [0 1 2]
Ranging over a non-positive integer executes the block zero times.
See Go’s text/template documentation for more information.