# XWiki Syntax Guide

由 CMO 于 2022-05-03 最后修改
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XWiki Syntax 2.1 » Editing » Images

## XWiki Syntax 2.1: Images

### 2.1 Images

Feature | XWiki Syntax 2.1 | Result
--- | --- | ---
Image from attachment on current page | image:img.png |
Image from attachment on another page | image:PageA.PageB@img.png |
Image with parameters | [[image:img.png||width="25" height="25"]] |
Image with caption | [[~[~[XWiki~>~>https://www.xwiki.org~]~] supports captions.>>image:img.png]] | XWiki supports captions.
Images located at URL | image:https://some/url/img.png |
Prepackaged Icons | image:icon:accept |

### XWiki Syntax 2.1 Image Specification

Legend: The parts are () are required, while the parts in {} are optional.

The full format of an image is either image: (reference) or [[{caption>>}image: (reference) {||parameters}]]

- caption: An optional caption. May contain arbitrary XWiki 2.1 syntax but nested link syntax must be escaped using ~. The caption is only supported when the image syntax is the only content of a paragraph.
- image: A required string identifying the resource as image.
- reference: The reference to the image that shall be displayed in one of the following forms:
  - URL: Any URL to an image in the form of [url:](protocol://path/imageName). Example: http://domain.org/path/img.png
    - url: An optional string identifying the image as an URL.
    - protocol://path/imageName: The URL to the image
  - Attachment: A reference in the form [attach:]{{{(wikiName):}(spaceNameList).}(pageName)@}(imageName)
    - attach: An optional string identifying the reference as an XWiki attachment.
    - wikiName: An optional string containing the name of a wiki. The image reference will point to an image attached to a page inside that wiki. If no wiki is specified, the current wiki is used. Example: mywiki.
    - spaceNameList: An optional dot-separated list of wiki Space names. If no space is specified the current space is used. Examples: Main, A.B, A.B.C
    - pageName: An optional string containing the name of the wiki page to which the referenced image is attached. Example: Welcome
    - imageName: A required string containing the name of the image attached to a page as it is stored in the wiki. Example: myImage.png
  - Icon: A reference in the form icon:(iconName). Example: icon:accept
    - icon: A required string identifying the image reference as an icon from the XWiki Icon Set.
    - iconName: A required string identifying the icon referenced. Example: accept
  - Data URI: A reference in the form (data:)(content). Example: data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==
    - data: A required string identifying the image as being specified inline using the Data URI scheme.
    - content: The encoded image. Example: image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAUAAAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO9TXL0Y4OHwAAAABJRU5ErkJggg==
- parameters: An optional list of space-separated parameters passed to the image. Example: width="800" height="600" alt="img.png" title="My nice image"
  - HTML attributes: All attributes defined by the HTML standard will be added to the rendered HTML <img> tag.
    - style: CSS style information that should be applied to the image. Examples: style="float:right;height:50" (image on right side, height 50 px), style="display:block;margin-left:auto;margin-right:auto;width:80%" (image centered, width 80% of block width), style="vertical-align:bottom" (text starts at bottom of picture)
    - height: A parameter that defines the height of the displayed image. The value should be presented either in pixel (example: height="80") or in pixel related to the height of the block containing the image (example: height="40%").
    - width: A parameter that defines the width of the displayed image. The value should be presented either in pixel (example: width="80") or in pixel related to the width of the block containing the image (example: width="40%").
    - title: A parameter that defines the title the displayed image which will be visible when hovering the mouse trigger over the image, for instance. Example: title="My nice image"
    - alt: A parameter that defines which text should be displayed if the browser is not able to display the image. Since this is a required HTML attribute XWiki will use the file name instead if the alt parameter is not defined. Example: alt="img.png"
    - More: A more in depth explanation on the HTML <img> tag including more attributes can be reviewed in the HTML standard.
  - queryString: Allows queries to be passed to the server when creating the download link for the referenced image. Example: queryString="width=100&height=800&keepAspectRatio=true" (keepAspectRatio=true will fail if the width and height parameters are specified in addition to queryString!)

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