mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-29 03:22:09 -05:00
87 lines
1.9 KiB
Markdown
87 lines
1.9 KiB
Markdown
---
|
|
title: with
|
|
description: Binds context (the dot) to the expression and executes the block if expression is truthy.
|
|
categories: []
|
|
keywords: []
|
|
action:
|
|
aliases: []
|
|
related:
|
|
- functions/go-template/if
|
|
- functions/go-template/else
|
|
- functions/go-template/end
|
|
- functions/collections/IsSet
|
|
returnType:
|
|
signatures: [with EXPR]
|
|
aliases: [/functions/with]
|
|
toc: true
|
|
---
|
|
|
|
{{% include "functions/go-template/_common/truthy-falsy.md" %}}
|
|
|
|
```go-html-template
|
|
{{ $var := "foo" }}
|
|
{{ with $var }}
|
|
{{ . }} → foo
|
|
{{ end }}
|
|
```
|
|
|
|
Use with the [`else`] statement:
|
|
|
|
```go-html-template
|
|
{{ $var := "foo" }}
|
|
{{ with $var }}
|
|
{{ . }} → foo
|
|
{{ else }}
|
|
{{ print "var is falsy" }}
|
|
{{ end }}
|
|
```
|
|
|
|
Initialize a variable, scoped to the current block:
|
|
|
|
```go-html-template
|
|
{{ with $var := 42 }}
|
|
{{ . }} → 42
|
|
{{ $var }} → 42
|
|
{{ end }}
|
|
{{ $var }} → undefined
|
|
```
|
|
|
|
## Understanding context
|
|
|
|
At the top of a page template, the [context] (the dot) is a `Page` object. Inside of the `with` block, the context is bound to the value passed to the `with` statement.
|
|
|
|
With this contrived example:
|
|
|
|
```go-html-template
|
|
{{ with 42 }}
|
|
{{ .Title }}
|
|
{{ end }}
|
|
```
|
|
|
|
Hugo will throw an error:
|
|
|
|
can't evaluate field Title in type int
|
|
|
|
The error occurs because we are trying to use the `.Title` method on an integer instead of a `Page` object. Inside of the `with` block, if we want to render the page title, we need to get the context passed into the template.
|
|
|
|
{{% note %}}
|
|
Use the `$` to get the context passed into the template.
|
|
{{% /note %}}
|
|
|
|
This template will render the page title as desired:
|
|
|
|
```go-html-template
|
|
{{ with 42 }}
|
|
{{ $.Title }}
|
|
{{ end }}
|
|
```
|
|
|
|
{{% note %}}
|
|
Gaining a thorough understanding of context is critical for anyone writing template code.
|
|
{{% /note %}}
|
|
|
|
[context]: /getting-started/glossary/#context
|
|
|
|
{{% include "functions/go-template/_common/text-template.md" %}}
|
|
|
|
[`else`]: /functions/go-template/else/
|