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ac2c4a487 Update documentation for Ugly URLs (#1082) 88bdec17a Change 072.0 to 0.72.0 in release post's description 2aa7d7818 Update rss.md (#1104) c80677aeb Update quick-start.md (#1076) d04196bbd Minor spelling and capitalization fixes 837d2feba Fixed spelling mistake 67dc78e12 Update installing.md ce280c5d6 Update relurl.md bb4d0e703 Capitalization and Redirecting URL fixes e1fecada0 Update partials.md 1d99bb182 Typos and whitespacing issues fixed b20dba125 actually fix index function link this time f47d6f1e3 Fixing typos, whitespace issues and links dc82309b9 fix link to the index function 1eab0cbea add missing word (#1130) 9c3ee62ae more fixes e9bc5880a whitespace, typos and HTTPS fixes 93b806493 Add missing word to Module section 80ced9062 Display image on page bundles page. 727029b0a Update index.md 51fc48e4d Release 0.72.0 1ff68ac3b releaser: Add release notes to /docs for release of 0.72.0 f74a25b92 common/maps: Add Scratch.Values 2fd83db96 Add redirect support to the server bdfccf9f4 Fix typo in install instructions e12737ea6 Create SUPPORT.md git-subtree-dir: docs git-subtree-split: ac2c4a4871e90ddfb180f23704ce7ec9023529ca
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| title | linktitle | description | godocref | date | publishdate | lastmod | categories | menu | keywords | signature | workson | hugoversion | relatedfuncs | deprecated | aliases | needsexample | ||||||||
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| index | index | Looks up the index(es) or key(s) of the data structure passed into it. | https://golang.org/pkg/text/template/#hdr-Functions | 2017-02-01 | 2017-02-01 | 2017-02-01 |
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The index functions returns the result of indexing its first argument by the following arguments. Each indexed item must be a map or a slice, e.g.:
{{ $slice := slice "a" "b" "c" }}
{{ index $slice 1 }} => b
{{ $map := dict "a" 100 "b" 200 }}
{{ index $map "b" }} => 200
The function takes multiple indices as arguments, and this can be used to get nested values, e.g.:
{{ $map := dict "a" 100 "b" 200 "c" (slice 10 20 30) }}
{{ index $map "c" 1 }} => 20
{{ $map := dict "a" 100 "b" 200 "c" (dict "d" 10 "e" 20) }}
{{ index $map "c" "e" }} => 20
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:
- The node path
- 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