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169 lines
6 KiB
Markdown
169 lines
6 KiB
Markdown
---
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title : "Page Resources"
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description : "Page Resources -- images, other pages, documents etc. -- have page-relative URLs and their own metadata."
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date: 2018-01-24
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categories: ["content management"]
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keywords: [bundle,content,resources]
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weight: 4003
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draft: false
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toc: true
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linktitle: "Page Resources"
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menu:
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docs:
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parent: "content-management"
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weight: 31
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---
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Page resources are available for [page bundles]({{< relref "/content-management/page-bundles" >}}) only,
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i.e. a directory with either a `index.md`, or `_index.md` file at its root. Resources are only attached to
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the lowest page they are bundled with, and simple which names does not contain `index.md` are not attached any resource.
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## Properties
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ResourceType
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: The main type of the resource. For example, a file of MIME type `image/jpeg` has the ResourceType `image`.
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Name
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: Default value is the filename (relative to the owning page). Can be set in front matter.
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Title
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: Default value is the same as `.Name`. Can be set in front matter.
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Permalink
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: The absolute URL to the resource. Resources of type `page` will have no value.
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RelPermalink
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: The relative URL to the resource. Resources of type `page` will have no value.
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Content
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: The content of the resource itself. For most resources, this returns a string with the contents of the file. This can be used to inline some resources, such as `<script>{{ (.Resources.GetMatch "myscript.js").Content | safeJS }}</script>` or `<img src="{{ (.Resources.GetMatch "mylogo.png").Content | base64Encode }}">`.
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MediaType
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: The MIME type of the resource, such as `image/jpeg`.
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MediaType.MainType
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: The main type of the resource's MIME type. For example, a file of MIME type `application/pdf` has for MainType `application`.
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MediaType.SubType
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: The subtype of the resource's MIME type. For example, a file of MIME type `application/pdf` has for SubType `pdf`. Note that this is not the same as the file extension - PowerPoint files have a subtype of `vnd.mspowerpoint`.
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MediaType.Suffixes
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: A slice of possible suffixes for the resource's MIME type.
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## Methods
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ByType
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: Returns the page resources of the given type.
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```go
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{{ .Resources.ByType "image" }}
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```
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Match
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: Returns all the page resources (as a slice) whose `Name` matches the given Glob pattern ([examples](https://github.com/gobwas/glob/blob/master/readme.md)). The matching is case-insensitive.
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```go
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{{ .Resources.Match "images/*" }}
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```
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GetMatch
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: Same as `Match` but will return the first match.
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### Pattern Matching
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```go
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// Using Match/GetMatch to find this images/sunset.jpg ?
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.Resources.Match "images/sun*" ✅
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.Resources.Match "**/sunset.jpg" ✅
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.Resources.Match "images/*.jpg" ✅
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.Resources.Match "**.jpg" ✅
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.Resources.Match "*" 🚫
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.Resources.Match "sunset.jpg" 🚫
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.Resources.Match "*sunset.jpg" 🚫
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```
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## Page Resources Metadata
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The page resources' metadata is managed from the corresponding page's front matter with an array/table parameter named `resources`. You can batch assign values using [wildcards](https://tldp.org/LDP/GNU-Linux-Tools-Summary/html/x11655.htm).
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{{% note %}}
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Resources of type `page` get `Title` etc. from their own front matter.
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{{% /note %}}
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name
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: Sets the value returned in `Name`.
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{{% warning %}}
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The methods `Match` and `GetMatch` use `Name` to match the resources.
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{{%/ warning %}}
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title
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: Sets the value returned in `Title`
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params
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: A map of custom key/values.
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### Resources metadata example
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{{< code-toggle copy="false">}}
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title: Application
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date : 2018-01-25
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resources :
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- src : "images/sunset.jpg"
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name : "header"
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- src : "documents/photo_specs.pdf"
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title : "Photo Specifications"
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params:
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icon : "photo"
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- src : "documents/guide.pdf"
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title : "Instruction Guide"
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- src : "documents/checklist.pdf"
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title : "Document Checklist"
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- src : "documents/payment.docx"
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title : "Proof of Payment"
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- src : "**.pdf"
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name : "pdf-file-:counter"
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params :
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icon : "pdf"
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- src : "**.docx"
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params :
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icon : "word"
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{{</ code-toggle >}}
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From the example above:
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- `sunset.jpg` will receive a new `Name` and can now be found with `.GetMatch "header"`.
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- `documents/photo_specs.pdf` will get the `photo` icon.
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- `documents/checklist.pdf`, `documents/guide.pdf` and `documents/payment.docx` will get `Title` as set by `title`.
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- Every `PDF` in the bundle except `documents/photo_specs.pdf` will get the `pdf` icon.
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- All `PDF` files will get a new `Name`. The `name` parameter contains a special placeholder [`:counter`](#the-counter-placeholder-in-name-and-title), so the `Name` will be `pdf-file-1`, `pdf-file-2`, `pdf-file-3`.
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- Every docx in the bundle will receive the `word` icon.
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{{% warning %}}
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The __order matters__ --- Only the **first set** values of the `title`, `name` and `params`-**keys** will be used. Consecutive parameters will be set only for the ones not already set. In the above example, `.Params.icon` is first set to `"photo"` in `src = "documents/photo_specs.pdf"`. So that would not get overridden to `"pdf"` by the later set `src = "**.pdf"` rule.
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{{%/ warning %}}
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### The `:counter` placeholder in `name` and `title`
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The `:counter` is a special placeholder recognized in `name` and `title` parameters `resources`.
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The counter starts at 1 the first time they are used in either `name` or `title`.
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For example, if a bundle has the resources `photo_specs.pdf`, `other_specs.pdf`, `guide.pdf` and `checklist.pdf`, and the front matter has specified the `resources` as:
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{{< code-toggle copy="false">}}
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[[resources]]
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src = "*specs.pdf"
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title = "Specification #:counter"
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[[resources]]
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src = "**.pdf"
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name = "pdf-file-:counter"
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{{</ code-toggle >}}
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the `Name` and `Title` will be assigned to the resource files as follows:
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| Resource file | `Name` | `Title` |
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|-------------------|-------------------|-----------------------|
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| checklist.pdf | `"pdf-file-1.pdf` | `"checklist.pdf"` |
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| guide.pdf | `"pdf-file-2.pdf` | `"guide.pdf"` |
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| other\_specs.pdf | `"pdf-file-3.pdf` | `"Specification #1"` |
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| photo\_specs.pdf | `"pdf-file-4.pdf` | `"Specification #2"` |
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