mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-09 03:44:29 -05:00
33 lines
1.1 KiB
Markdown
33 lines
1.1 KiB
Markdown
|
---
|
||
|
title: isset
|
||
|
linktitle: isset
|
||
|
description: Returns true if the parameter is set.
|
||
|
godocref:
|
||
|
date: 2017-02-01
|
||
|
publishdate: 2017-02-01
|
||
|
lastmod: 2017-02-01
|
||
|
categories: [functions]
|
||
|
menu:
|
||
|
docs:
|
||
|
parent: "functions"
|
||
|
keywords: []
|
||
|
signature: ["isset COLLECTION INDEX", "isset COLLECTION KEY"]
|
||
|
workson: []
|
||
|
hugoversion:
|
||
|
relatedfuncs: []
|
||
|
deprecated: false
|
||
|
aliases: []
|
||
|
---
|
||
|
|
||
|
Takes either a slice, array, or channel and an index or a map and a key as input.
|
||
|
|
||
|
```
|
||
|
{{ if isset .Params "project_url" }} {{ index .Params "project_url" }}{{ end }}
|
||
|
```
|
||
|
|
||
|
{{% warning %}}
|
||
|
All site-level configuration keys are stored as lower case. Therefore, a `myParam` key-value set in your [site configuration file](/getting-started/configuration/) needs to be accessed with `{{if isset .Site.Params "myparam"}}` and *not* with `{{if isset .Site.Params "myParam"}}`. Note that you can still access the same config key with `.Site.Params.myParam` *or* `.Site.Params.myparam`, for example, when using [`with`](/functions/with).
|
||
|
This restriction also applies when accessing page-level front matter keys from within [shortcodes](/content-management/shortcodes/).
|
||
|
{{% /warning %}}
|
||
|
|