Manual:Linked images/ja

MediaWiki の画像は既定で説明ページにリンクされ、利用者が画像をクリックすると、ライセンス情報、アップロード履歴、投稿者、フル解像度のバージョンをすぐに利用できます.

しかし、それを必要とする人にはいくつかの回避策があります.



バージョン1.14からlink=構文が利用可能になりました.
画像から直接内部または外部へのリンクは、で説明されている構文で可能です.

このネイティブな画像リンクのサポートはMediaWiki v1.14 以降で追加され (r41727. b539 を参照)、以下の回避策もしくは拡張機能の必要性を否定します.

In your wikicode:

This will make a 50px width picture with a link to the page MediaWiki:



If you put the link empty, the image will no longer be clickable.



Old CSS workarounds for vanilla installs pre 1.14
MediaWiki was for a long time designed to prevent manual manipulation of images in wikicode which may circumvent the link to description page operation: The tag is specifically not whitelisted in the, nor is the   CSS attribute.

On these older versions, there were the following workarounds.

Site CSS
The simplest method, if your requirements for external images are specialized (that is, restricted to one page or one image), is to add a CSS rule to your MediaWiki:Common.css (or other CSS files, such as MediaWiki:Skinname.css or /skins/skinname/main.css, etc) giving child links of a certain class of object a background image. This method also has some security, as it requires editing the site-wide CSS files, meaning only sysops have access to modify the image shown.

For example (red sections are parts to configure for each image):

In MediaWiki:Common.css:

.imagelink_ somename a { width: 100 px; height: 100 px; display:block; text-decoration:none; background-image: url(" http://fullurltoimage ") }

In your wikicode:

&lt;div class="imagelink_ somename "&gt; &amp;nbsp; &lt;/div&gt;

This would give the link the background image specified, as well as the width and height of the image (which you have to set manually). To find the location of an uploaded file, go to the image description page and click the image itself, and copy the image location in the address bar.

For example on Image:Wiki.png, the image location is http://upload.wikimedia.org/wikipedia/mediawiki/b/bc/Wiki.png (location format will differ depending on local settings), and the width and height would be set to 135px and 135px. So to make a link to the main page here using that logo, one would add to MediaWiki:Common.css:

And then use the wikicode:

Which would give you:

 

You can also use a thumbnail of an image, but make sure the thumbnail is being used elsewhere, as most installations are not configured to generate thumbnails on demand.

Inline CSS
You can also attempt to superimpose an invisible link over an image via CSS, such as is done in w:Template:Click. An example of a typical click template is:

Known problems: It doesn't work in text-only browsers, and in screen readers for the disabled, and possibly other situations. The technique of using CSS to change page content also completely breaks an article's web accessibility by contravening a WAI priority-one checkpoint. |WAI-WEBCONTENT/#tech-order-style-sheets

Native with configuration change
If you have server access, but do not want to install any extensions, these solutions may work for you.

External image syntax
If you enable (which allows external images from any domain) or  (which restricts the list of domains), anyone can then easily create an "external" link to an "external" image. External simply means: using the full URL rather than a local link, so you can link locally, but you need to use the full URL. The plainlinks class is used to remove the "external link" icon:

After enabling, you can also embed an image by simply typing the URL of the image. For example, http://domain.com/images/image_file.png will display the image on screen.

&lt;span class="plainlinks"&gt; [http:// linktopage http:// linktoimage ] &lt;/span&gt;

So for example, were external images allowed here, you could link to the with http://upload.wikimedia.org/wikipedia/mediawiki/b/bc/Wiki.png using wikicode like:

This has the disadvantage of not registering the link, or the image use, as well as not being easily portable to forks and mirrors.

Raw HTML
If you enable, you can use tags freely, but this method is highly insecure. On newer MediaWiki you can use the  option which allows &lt;img&gt; and is more secure than raw html.

There are, however, some extensions to make it safer, see for details.

Via extensions
If you are willing to install an extension, several extensions have been created to address this issue:


 * - advanced image shape-link extension, uses the html USEMAP features (xml tag)

Or you can invent your own linked image syntax, by writing an extension that registers it as a parser hook. See for information on extending MediaWiki syntax.

Other options
If you want, you can do some more drastic things, such as modify /includes/Sanitizer.php (where the HTML tag whitelist is), and add &lt;img /&gt; to the list of allowed tags.

