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101 lines
2.1 KiB
Markdown
101 lines
2.1 KiB
Markdown
---
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title: with
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description: Binds context (the dot) to the expression and executes the block if expression is truthy.
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categories: []
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keywords: []
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action:
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aliases: []
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related:
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- functions/go-template/if
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- functions/go-template/else
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- functions/go-template/end
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- functions/collections/IsSet
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returnType:
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signatures: [with EXPR]
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aliases: [/functions/with]
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toc: true
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---
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{{% include "functions/go-template/_common/truthy-falsy.md" %}}
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```go-html-template
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{{ $var := "foo" }}
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{{ with $var }}
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{{ . }} → foo
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{{ end }}
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```
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Use with the [`else`] statement:
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```go-html-template
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{{ $var := "foo" }}
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{{ with $var }}
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{{ . }} → foo
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{{ else }}
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{{ print "var is falsy" }}
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{{ end }}
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```
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Use `else with` to check multiple conditions:
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```go-html-template
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{{ $v1 := 0 }}
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{{ $v2 := 42 }}
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{{ with $v1 }}
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{{ . }}
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{{ else with $v2 }}
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{{ . }} → 42
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{{ else }}
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{{ print "v1 and v2 are falsy" }}
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{{ end }}
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```
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Initialize a variable, scoped to the current block:
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```go-html-template
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{{ with $var := 42 }}
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{{ . }} → 42
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{{ $var }} → 42
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{{ end }}
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{{ $var }} → undefined
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```
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## Understanding context
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At the top of a page template, the [context] (the dot) is a `Page` object. Inside of the `with` block, the context is bound to the value passed to the `with` statement.
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With this contrived example:
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```go-html-template
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{{ with 42 }}
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{{ .Title }}
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{{ end }}
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```
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Hugo will throw an error:
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can't evaluate field Title in type int
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The error occurs because we are trying to use the `.Title` method on an integer instead of a `Page` object. Inside of the `with` block, if we want to render the page title, we need to get the context passed into the template.
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{{% note %}}
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Use the `$` to get the context passed into the template.
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{{% /note %}}
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This template will render the page title as desired:
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```go-html-template
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{{ with 42 }}
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{{ $.Title }}
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{{ end }}
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```
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{{% note %}}
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Gaining a thorough understanding of context is critical for anyone writing template code.
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{{% /note %}}
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[context]: /getting-started/glossary/#context
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{{% include "functions/go-template/_common/text-template.md" %}}
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[`else`]: /functions/go-template/else/
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