Scratch

PAGE.Scratch

maps.Scratch

The Scratch method on a Page object creates a scratch pad to store and manipulate data. To create a scratch pad that is not reset on server rebuilds, use the Store method instead.

To create a locally scoped scratch pad that is not attached to a Page object, use the newScratch function.

Methods

Set

Sets the value of a given key.

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

Get

Gets the value of a given key.

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

Add

Adds a given value to existing value(s) 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.Set "greeting" "Hello" }}
{{ .Scratch.Add "greeting" "Welcome" }}
{{ .Scratch.Get "greeting" }} → HelloWelcome

{{ .Scratch.Set "total" 3 }}
{{ .Scratch.Add "total" 7 }}
{{ .Scratch.Get "total" }} → 10

{{ .Scratch.Set "greetings" (slice "Hello") }}
{{ .Scratch.Add "greetings" (slice "Welcome" "Cheers") }}
{{ .Scratch.Get "greetings" }} → [Hello Welcome Cheers]

SetInMap

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

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

DeleteInMap

Takes a key and mapKey and removes the map of mapKey from the given key.

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

GetSortedMapValues

Returns an 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.Set "greeting" "Hello" }}
{{ .Scratch.Delete "greeting" }}

Determinate values

The Scratch method is often used to set scratch pad values within a shortcode, a partial template called by a shortcode, or by a Markdown render hook. In all three cases, the scratch pad values are indeterminate until Hugo renders the page content.

If you need to access a scratch pad value from a parent template, and the parent template has not yet rendered the page content, you can trigger content rendering by assigning the returned value to a noop variable:

{{ $noop := .Content }}
{{ .Store.Get "mykey" }}

You can also trigger content rendering with the ContentWithoutSummary, FuzzyWordCount, Len, Plain, PlainWords, ReadingTime, Summary, Truncated, and WordCount methods. For example:

{{ $noop := .WordCount }}
{{ .Store.Get "mykey" }}