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Diffstat (limited to 'docs/content/en/functions/isset.md')
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diff --git a/docs/content/en/functions/isset.md b/docs/content/en/functions/isset.md new file mode 100644 index 000000000..d6aa2b597 --- /dev/null +++ b/docs/content/en/functions/isset.md @@ -0,0 +1,32 @@ +--- +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 %}} + |