blob: dff3eed72897ea20373d4993c78e40bfca00d84e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
|
---
title: range
description: Iterates over a non-empty collection, binds context (the dot) to successive elements, and executes the block.
categories: []
keywords: []
action:
aliases: []
related:
- functions/go-template/break
- functions/go-template/continue
- functions/go-template/else
- functions/go-template/end
returnType:
signatures: [range COLLECTION]
aliases: [/functions/range]
toc: true
---
{{% include "functions/go-template/_common/truthy-falsy.md" %}}
```go-html-template
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
{{ . }} → foo bar baz
{{ end }}
```
Use with the [`else`] statement:
```go-html-template
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
<p>{{ . }}</p>
{{ else }}
<p>The collection is empty</p>
{{ end }}
```
Within a range block:
- Use the [`continue`] statement to stop the innermost iteration and continue to the next iteration
- Use the [`break`] statement to stop the innermost iteration and bypass all remaining iterations
## Understanding context
At the top of a page template, the [context] (the dot) is a `Page` object. Within the `range` block, the context is bound to each successive element.
With this contrived example that uses the [`seq`] function to generate a slice of integers:
```go-html-template
{{ range seq 3 }}
{{ .Title }}
{{ end }}
```
Hugo will throw an error:
can't evaluate field Title in type int
The error occurs because we are trying to use the `.Title` method on an integer instead of a `Page` object. Within the `range` block, if we want to render the page title, we need to get the context passed into the template.
{{% note %}}
Use the `$` to get the context passed into the template.
{{% /note %}}
This template will render the page title three times:
```go-html-template
{{ range seq 3 }}
{{ $.Title }}
{{ end }}
```
{{% note %}}
Gaining a thorough understanding of context is critical for anyone writing template code.
{{% /note %}}
[`seq`]: /functions/collections/seq/
[context]: /getting-started/glossary/#context
## Array or slice of scalars
This template code:
```go-html-template
{{ $s := slice "foo" "bar" "baz" }}
{{ range $s }}
<p>{{ . }}</p>
{{ end }}
```
Is rendered to:
```html
<p>foo</p>
<p>bar</p>
<p>baz</p>
```
This template code:
```go-html-template
{{ $s := slice "foo" "bar" "baz" }}
{{ range $v := $s }}
<p>{{ $v }}</p>
{{ end }}
```
Is rendered to:
```html
<p>foo</p>
<p>bar</p>
<p>baz</p>
```
This template code:
```go-html-template
{{ $s := slice "foo" "bar" "baz" }}
{{ range $k, $v := $s }}
<p>{{ $k }}: {{ $v }}</p>
{{ end }}
```
Is rendered to:
```html
<p>0: foo</p>
<p>1: bar</p>
<p>2: baz</p>
```
## Array or slice of maps
This template code:
```go-html-template
{{ $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:
```html
<p>John is 30</p>
<p>Will is 28</p>
<p>Joey is 24</p>
```
## Array or slice of pages
This template code:
```go-html-template
{{ range where site.RegularPages "Type" "articles" }}
<h2><a href="{{ .RelPermalink }}">{{ .LinkTitle }}</a></h2>
{{ end }}
```
Is rendered to:
```html
<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:
```go-html-template
{{ $m := dict "name" "John" "age" 30 }}
{{ range $k, $v := $m }}
<p>key = {{ $k }} value = {{ $v }}</p>
{{ end }}
```
Is rendered to:
```go-html-template
<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.
{{% include "functions/go-template/_common/text-template.md" %}}
[`else`]: /functions/go-template/else/
[`break`]: /functions/go-template/break/
[`continue`]: /functions/go-template/continue/
|
