mirror of
https://github.com/gohugoio/hugo.git
synced 2024-12-29 17:10:58 +00:00
141 lines
4.6 KiB
Markdown
141 lines
4.6 KiB
Markdown
---
|
|
aliases:
|
|
- /doc/datadrivencontent/
|
|
date: 2015-02-14
|
|
menu:
|
|
main:
|
|
parent: extras
|
|
next: /extras/highlighting
|
|
prev: /extras/datafiles
|
|
title: Data-driven Content
|
|
weight: 91
|
|
toc: true
|
|
---
|
|
|
|
Data-driven content with a static site generator? Yes, it is possible!
|
|
|
|
In addition to the [data files](/extras/datafiles/) feature, we have also
|
|
implemented the feature "Data-driven Content", which lets you load
|
|
any [JSON](http://www.json.org/) or
|
|
[CSV](http://en.wikipedia.org/wiki/Comma-separated_values) file
|
|
from nearly any resource.
|
|
|
|
"Data-driven Content" currently consists of two functions, `getJSON`
|
|
and `getCSV`, which are available in **all template files**.
|
|
|
|
## Implementation details
|
|
|
|
### Calling the functions with an URL
|
|
|
|
In any HTML template or Markdown document, call the functions like this:
|
|
|
|
{{ $dataJ := getJSON "url" }}
|
|
{{ $dataC := getCSV "separator" "url" }}
|
|
|
|
or, if you use a prefix or postfix for the URL, the functions
|
|
accept [variadic arguments](http://en.wikipedia.org/wiki/Variadic_function):
|
|
|
|
{{ $dataJ := getJSON "url prefix" "arg1" "arg2" "arg n" }}
|
|
{{ $dataC := getCSV "separator" "url prefix" "arg1" "arg2" "arg n" }}
|
|
|
|
The separator for `getCSV` must be put in the first position and can only
|
|
be one character long.
|
|
|
|
All passed arguments will be joined to the final URL; for example:
|
|
|
|
{{ $urlPre := "https://api.github.com" }}
|
|
{{ $gistJ := getJSON $urlPre "/users/GITHUB_USERNAME/gists" }}
|
|
|
|
will resolve internally to:
|
|
|
|
{{ $gistJ := getJSON "https://api.github.com/users/GITHUB_USERNAME/gists" }}
|
|
|
|
Finally, you can range over an array. This example will output the
|
|
first 5 gists for a GitHub user:
|
|
|
|
<ul>
|
|
{{ $urlPre := "https://api.github.com" }}
|
|
{{ $gistJ := getJSON $urlPre "/users/GITHUB_USERNAME/gists" }}
|
|
{{ range first 5 $gistJ }}
|
|
{{ if .public }}
|
|
<li><a href="{{ .html_url }}" target="_blank">{{ .description }}</a></li>
|
|
{{ end }}
|
|
{{ end }}
|
|
</ul>
|
|
|
|
|
|
### Example for CSV files
|
|
|
|
For `getCSV`, the one-character long separator must be placed in the
|
|
first position followed by the URL.
|
|
|
|
<table>
|
|
<thead>
|
|
<tr>
|
|
<th>Name</th>
|
|
<th>Position</th>
|
|
<th>Salary</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody>
|
|
{{ $url := "http://a-big-corp.com/finance/employee-salaries.csv" }}
|
|
{{ $sep := "," }}
|
|
{{ range $i, $r := getCSV $sep $url }}
|
|
<tr>
|
|
<td>{{ index $r 0 }}</td>
|
|
<td>{{ index $r 1 }}</td>
|
|
<td>{{ index $r 2 }}</td>
|
|
</tr>
|
|
{{ end }}
|
|
</tbody>
|
|
</table>
|
|
|
|
The expression `{{index $r number}}` must be used to output the nth-column from
|
|
the current row.
|
|
|
|
### Caching of URLs
|
|
|
|
Each downloaded URL will be cached in the default folder `$TMPDIR/hugo_cache/`.
|
|
The variable `$TMPDIR` will be resolved to your system-dependent
|
|
temporary directory.
|
|
|
|
With the command-line flag `--cacheDir`, you can specify any folder on
|
|
your system as a caching directory.
|
|
|
|
If you don't like caching at all, you can fully disable to read from the
|
|
cache with the command line flag `--ignoreCache`. However, Hugo will always
|
|
write, on each build of the site, to the cache folder (silent backup).
|
|
|
|
### Authentication when using REST URLs
|
|
|
|
Currently, you can only use those authentication methods that can
|
|
be put into an URL. [OAuth](http://en.wikipedia.org/wiki/OAuth) or
|
|
other authentication methods are not implemented.
|
|
|
|
### Loading local files
|
|
|
|
To load local files with the two functions `getJSON` and `getCSV`, the
|
|
source files must reside within Hugo's working directory. The file
|
|
extension does not matter but the content.
|
|
|
|
It applies the same output logic as in the topic: *Calling the functions with an URL*.
|
|
|
|
## LiveReload
|
|
|
|
There is no chance to trigger a [LiveReload](/extras/livereload/) when
|
|
the content of an URL changes. However, when a local JSON/CSV file changes,
|
|
then a LiveReload will be triggered of course. Symlinks not supported.
|
|
|
|
**URLs and LiveReload**: If you change any local file and the LiveReload
|
|
got triggered, Hugo will either read the URL content from the cache or, if
|
|
you have disabled the cache, Hugo will re-download the content.
|
|
This can create huge traffic and you may also reach API limits quickly.
|
|
|
|
As downloading of content takes a while, Hugo stops with processing
|
|
your Markdown files until the content has been downloaded.
|
|
|
|
## Examples
|
|
|
|
- Photo gallery JSON powered: [https://github.com/pcdummy/hugo-lightslider-example](https://github.com/pcdummy/hugo-lightslider-example)
|
|
- GitHub Starred Repositories [in a posts](https://github.com/SchumacherFM/blog-cs/blob/master/content%2Fposts%2Fgithub-starred.md) with the related [short code](https://github.com/SchumacherFM/blog-cs/blob/master/layouts%2Fshortcodes%2FghStarred.html).
|
|
- More? Please tell us!
|