mirror of
https://github.com/gohugoio/hugo.git
synced 2024-11-14 20:37:55 -05:00
c029065582
4e7e1815b Fix some typos d23d8f5c4 Remove 'fundamentals' category from function pages 52fa65e15 Mention Chroma as the preferred syntax highlighter 64ca535db Merge commit '8762aee8afe30bec6f1fbc9560749983dc44d60b' 8762aee8a Squashed 'themes/gohugoioTheme/' changes from 396b859f..6f3a8bf5 03f0673a9 Move the gopher to the theme 320e268cd Spelling e45b640f7 More layout lookup work fe0ad9d9d Sync the YAML config menu example with TOML's b9505fc70 Remove template reference to ordinal numbers 0fa2532d3 Remove deprecated Hugoidx, add native hugo solution 2152b907c Fix a link in the last commit 47614f416 Manually specifying heading anchors in Markdown content 9d6770d2a Release notes 0.37.1 e1eed8b27 Remove some unused images e960046f5 releaser: Prepare repository for 0.38-DEV 4fa83a4ee releaser: Add release notes to /docs for release of 0.37.1 46c879995 releaser: Bump versions for release of 0.37.1 fb3ac5a3e releaser: Prepare repository for 0.38-DEV 4870c8e7b Update archetypes.md 232c0b578 Merge commit '2b18014fd0aa99e9f1a5610ba875101351a90de3' 2b18014fd Squashed 'themes/gohugoioTheme/' changes from fe71e360..396b859f 62567e9aa Add some "writing guidelines" 7cfd530d2 Revise the archetype docs 5d4c3c03c Update data-templates.md e5fee3099 Update page-bundles.md ca7f03c8d Update page-bundles.md 2a7fdc269 Fix typo 'vailable' to 'available' line 53 999b75201 LastMod should be Lastmod? 099f46ca5 Fix spacing in content-management/types.md 6bcdc58ef Word choice improvements 20e8a21f6 update rss linking docs 7ef44d262 Add some missing configuration entries f1c7aa568 Sort config list 5cb8ceade Create a proper definition list for the configuration settings 25dffe4ac Send custom dimensions in GA 55df01a34 Fix broken gtag 6c8772aad Add site to GA config e63acb894 Remove conflicting release note for 0.35 f30083a23 Add branch to GA config 99caedb96 Set the small-multiples to draft 4a33c70ab Polish the Small Multiples showcase 7b2f1ea2e Add small multiples showcase e78e96bae Add new sponsor c42943041 updated to new Forestry logo e07eda273 Add OS env to faq 414f0dbc6 Release Hugo 0.37 85f0cc324 Merge branch 'temp37' 1e6da9497 Rebuild images 75e97adfc releaser: Add release notes to /docs for release of 0.37 50b887cb0 releaser: Bump versions for release of 0.37 7acf73ba3 Merge commit '900b5f6cfe5a377ef369d26cd700201be4cf6b06' 819d02c30 Merge commit '374d184e6747678364fd61f5faf328ec9205eb6b' c7eacf018 Fix typos in development contribution doc git-subtree-dir: docs git-subtree-split: 4e7e1815b742659dec1c8f59a1896a3396c7b6e9
84 lines
2.8 KiB
Markdown
84 lines
2.8 KiB
Markdown
---
|
|
title: index
|
|
linktitle: index
|
|
description: Looks up the index(es) or key(s) of the data structure passed into it.
|
|
godocref: https://golang.org/pkg/text/template/#hdr-Functions
|
|
date: 2017-02-01
|
|
publishdate: 2017-02-01
|
|
lastmod: 2017-02-01
|
|
categories: [functions]
|
|
menu:
|
|
docs:
|
|
parent: "functions"
|
|
keywords: []
|
|
signature: ["index COLLECTION INDEX", "index COLLECTION KEY"]
|
|
workson: []
|
|
hugoversion:
|
|
relatedfuncs: []
|
|
deprecated: false
|
|
aliases: [/functions/index/]
|
|
needsexample: true
|
|
---
|
|
|
|
From the Godocs:
|
|
|
|
> Returns the result of indexing its first argument by the following arguments. Thus "index x 1 2 3" is, in Go syntax, x[1][2][3]. Each indexed item must be a map, slice, or array.
|
|
|
|
In Go templates, you can't access array, slice, or map elements directly the same way you would in Go. For example, `$.Site.Data.authors[.Params.authorkey]` isn't supported syntax.
|
|
|
|
Instead, you have to use `index`, a function that handles the lookup for you.
|
|
|
|
## Example: Load Data from a Path Based on Front Matter Params
|
|
|
|
Assume you want to add a `location = ""` field to your front matter for every article written in `content/vacations/`. You want to use this field to populate information about the location at the bottom of the article in your `single.html` template. You also have a directory in `data/locations/` that looks like the following:
|
|
|
|
```
|
|
.
|
|
└── data
|
|
└── locations
|
|
├── abilene.toml
|
|
├── chicago.toml
|
|
├── oslo.toml
|
|
└── provo.toml
|
|
```
|
|
|
|
Here is an example of the data inside `data/locations/oslo.toml`:
|
|
|
|
```
|
|
website = "https://www.oslo.kommune.no"
|
|
pop_city = 658390
|
|
pop_metro = 1717900
|
|
```
|
|
|
|
The example we will use will be an article on Oslo, whose front matter should be set to exactly the same name as the corresponding file name in `data/locations/`:
|
|
|
|
```
|
|
title = "My Norwegian Vacation"
|
|
location = "oslo"
|
|
```
|
|
|
|
The content of `oslo.toml` can be accessed from your template using the following node path: `.Site.Data.locations.oslo`. However, the specific file you need is going to change according to the front matter.
|
|
|
|
This is where the `index` function is needed. `index` takes 2 parameters in this use case:
|
|
|
|
1. The node path
|
|
2. A string corresponding to the desired data; e.g.—
|
|
|
|
```
|
|
{{ index .Site.Data.locations “oslo” }}
|
|
```
|
|
|
|
The variable for `.Params.location` is a string and can therefore replace `oslo` in the example above:
|
|
|
|
```
|
|
{{ index .Site.Data.locations .Params.location }}
|
|
=> map[website:https://www.oslo.kommune.no pop_city:658390 pop_metro:1717900]
|
|
```
|
|
|
|
Now the call will return the specific file according to the location specified in the content's front matter, but you will likely want to write specific properties to the template. You can do this by continuing down the node path via dot notation (`.`):
|
|
|
|
```
|
|
{{ (index .Site.Data.locations .Params.location).pop_city }}
|
|
=> 658390
|
|
```
|
|
|