hugo/content/en/functions/scratch.md
Bjørn Erik Pedersen 83bef6955e Squashed 'docs/' changes from 896bad9f4..e161ea09d
e161ea09d Add one more Chinese file to workaround reflect: Zero(nil)
b595b3a21 Add more Chinese translation
56e4e95d9 Use lang.Merge to "fill in the gaps" for untranslated pages
ef079406c Merge commit '650fac3a4e7d256f4505402ab44cfc3c804b8dea'
650fac3a4 Squashed 'themes/gohugoioTheme/' changes from a1768ebb..f31a3dc8
322eff899 Add Chinese language for menus
d90b886e0 Fix Markdown table syntax in previous commit
737f3dfca Update the leaf bundle vs branch bundle table
09fa1bc4e Clarify that `.Now` is obsolete
879ea3f6a Make release notes somewhat more consistent
0113e2051 Move 0.40.2-relnotes into content/en/news
77578f5bf Move content/ into new contentDir content/en/
4dcf7c709 Fix "reflect: Zero(nil)" error in showcase
63dd25505 Release 0.40.2
2076c0d56 releaser: Prepare repository for 0.41-DEV
070fe565e releaser: Add release notes to /docs for release of 0.40.2
4ce52e913 releaser: Bump versions for release of 0.40.2
41907c487 Fix typos in syntax-highlighting.md
91753ef3d Add missing backtick
b77274301 Remove duplicate release notes (0.27, 0.27.1, 0.35)
6e00da316 Remove obsolete content/release-notes/ directory
00a6d8c02 Change en dash back to `--` in 0.38.2-relnotes
51b32dc00 Update archetypes.md
d0e5c2307 Release 0.40.1
4538a6d5b releaser: Prepare repository for 0.41-DEV
91b391d70 releaser: Add release notes to /docs for release of 0.40.1
e0979d143 releaser: Bump versions for release of 0.40.1
7983967c2 Clean images
fe3fdd77d Polish showcase for Flesland Flis
e6dde3989 Showcase - Flesland Flis AS by Absoluttweb
73aa62290 Revive @spf13's special Hugo font
add67b335 Release Hugo 0.40
c0a26e5a6 Merge branch 'temp40'
beeabaaae releaser: Prepare repository for 0.41-DEV
e67d5e985 releaser: Add release notes to /docs for release of 0.40
6cdd95273 releaser: Bump versions for release of 0.40
bee21fb9b Revive the other Hugo logos too
4f45e8fe1 Fix the link type attribute for RSS in examples
8c67dc89a Fix example in delimit doc
e7f6c00d5 Revive the logo used on the forum
82b0cd26e Merge commit 'a215abf70e018f4bf40d6c09d8bd148d8684b33d'
119c8ca58 Merge commit 'd2ec1a06df8ab6b17ad05cb008d5701b40327d47'
db4683bd2 Improve .Get docs
05260b886 .Get function: fix syntax signature

git-subtree-dir: docs
git-subtree-split: e161ea09d33e3199f4998e4d2e9068d5a850f042
2018-05-04 09:44:21 +02:00

2.9 KiB

title description godocref date publishdate lastmod keywords categories menu toc signature workson hugoversion relatedfuncs deprecated draft aliases
.Scratch Acts as a "scratchpad" to allow for writable page- or shortcode-scoped variables. 2017-02-01 2017-02-01 2017-02-01
iteration
functions
docs
parent
functions
false false
/extras/scratch/
/doc/scratch/

In most cases you can do okay without Scratch, but due to scoping issues, there are many use cases that aren't solvable in Go Templates without Scratch's help.

{{% note %}} See this Go issue for the main motivation behind Scratch. {{% /note %}}

{{% note %}} For a detailed analysis of .Scratch and in context use cases, see this post. {{% /note %}}

Methods

Scratch is added to both Page and Shortcode -- with following methods:

.Set

Set the given value to a given key

{{ .Scratch.Set "greeting" "Hello" }}

.Get

Get the value of a given key

{{ .Scratch.Set "greeting" "Hello" }}
----
{{ .Scratch.Get "greeting" }} > Hello

.Add

Will add a given value to existing value of the given key.

For single values, Add accepts values that support Go's + operator. If the first Add for a key is an array or slice, the following adds will be appended to that list.

{{ .Scratch.Add "greetings" "Hello" }}
{{ .Scratch.Add "greetings" "Welcome" }}
----
{{ .Scratch.Get "greetings" }} > HelloWelcome
{{ .Scratch.Add "total" 3 }}
{{ .Scratch.Add "total" 7 }}
----
{{ .Scratch.Get "total" }} > 10
{{ .Scratch.Add "greetings" (slice "Hello") }}
{{ .Scratch.Add "greetings" (slice "Welcome" "Cheers") }}
----
{{ .Scratch.Get "greetings" }} > []interface {}{"Hello", "Welcome", "Cheers"}

.SetInMap

Takes a key, mapKey and value and add a map of mapKey and value to the given key.

{{ .Scratch.SetInMap "greetings" "english" "Hello" }}
{{ .Scratch.SetInMap "greetings" "french" "Bonjour" }}
----
{{ .Scratch.Get "greetings" }} > map[french:Bonjour english:Hello]

.GetSortedMapValues

Returns array of values from key sorted by mapKey

{{ .Scratch.SetInMap "greetings" "english" "Hello" }}
{{ .Scratch.SetInMap "greetings" "french" "Bonjour" }}
----
{{ .Scratch.GetSortedMapValues "greetings" }} > [Hello Bonjour]

.Delete

Removes the given key

{{ .Scratch.Delete "greetings" }}

Scope

The scope of the backing data is global for the given Page or Shortcode, and spans partial and shortcode includes.

Note that .Scratch from a shortcode will return the shortcode's Scratch, which in most cases is what you want. If you want to store it in the page scoped Scratch, then use .Page.Scratch.