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[[Help:Images|Images]] on a MediaWiki wiki are designed to link to the description page, so that licensing information, upload history, contributors, and full resolution versions are immediately available to the user when he or she clicks an image. In fact, MediaWiki is designed to prevent manual manipulation of images in wikicode which may circumvent this operation: The '''<tt><img></tt>''' tag is specifically not whitelisted in the | [[Help:Images|Images]] on a MediaWiki wiki are designed to link to the description page, so that licensing information, upload history, contributors, and full resolution versions are immediately available to the user when he or she clicks an image. In fact, MediaWiki is designed to prevent manual manipulation of images in wikicode which may circumvent this operation: The '''<tt><img></tt>''' tag is specifically not whitelisted in the [https://phabricator.wikimedia.org/source/mediawiki/browse/master/includes/Sanitizer.php Sanitizer], nor is the '''<tt>background-image</tt>''' CSS attribute. | ||
However, there are several workarounds for those that require them. | However, there are several workarounds for those that require them. | ||
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Native image link support was added in [[rev:41727|r41727]]. See [[bugzilla:539|b539]]. | Native image link support was added in [[rev:41727|r41727]]. See [[bugzilla:539|b539]]. | ||
==Vanilla install== | |||
If you only have sysop access to the Wiki, these are your best options. | |||
===Site CSS=== | |||
The most simplistic 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: | |||
'''<tt>.imagelink_<span style="color:red;">somename</span> a { | |||
width:<span style="color:red;">100</span>px; | |||
height:<span style="color:red;">100</span>px; | |||
display:block; | |||
text-decoration:none; | |||
background-image: url("<span style="color:red;"><nowiki>http://fullurltoimage</nowiki></span>") | |||
}</tt>''' | |||
In your wikicode: | |||
'''<tt><div class="imagelink_<span style="color:red;">somename</span>"><nowiki>[[</nowiki><span style="color:red;">Some link</span>|&nbsp;<nowiki>]]</nowiki></div></tt>''' | |||
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]]: | |||
<pre>.imagelink_wikilogo a { | |||
width:135px; | |||
height:135px; | |||
display:block; | |||
text-decoration:none; | |||
background-image: url("http://upload.wikimedia.org/wikipedia/mediawiki/b/bc/Wiki.png") | |||
}</pre> | |||
And then use the wikicode: | |||
<pre><div class="imagelink_wikilogo">[[MediaWiki|&nbsp;]]</div></pre> | |||
Which would give you: | |||
<div class="imagelink_wikilogo">[[MediaWiki| ]]</div> | |||
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 [[Template:Click]]. An example of a typical click template is: | |||
<pre><div style="position: relative; width: {{{width}}}; height: {{{height}}}; overflow: hidden;"> | |||
<div style="position: absolute; top: 0px; left: 0px; font-size: 100px; overflow: hidden; line-height: 100px; z-index: 3;">[[{{{link}}}|&nbsp;&nbsp;&nbsp;]]</div> | |||
<div style="position: absolute; top: 0px; left: 0px; z-index: 2;">[[Image:{{{image}}}|{{{width}}}|{{{link}}}]]</div> | |||
</div></pre> | |||
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 [[wikipedia:CSS|CSS]] to change page content also completely breaks an article's [[wikipedia:web accessibility|web accessibility]] by contravening a [[wikipedia:WAI|WAI]] priority-one checkpoint.[http://www.w3.org/TR/WAI-WEBCONTENT/#tech-order-style-sheets] | |||
===Redirect=== | |||
A less elegant trick is to make the image description page a redirect to the target. So for example [[:Image:Wiki.png]] would be changed to content: | |||
<pre>#REDIRECT [[MediaWiki]]</pre> | |||
There are several disadvantages to this: | |||
* It doesn't always work, some installations/versions have internamespace redirects disabled. | |||
* The image appears at the top of the article. This is because MediaWiki redirects aren't really redirects, they simply bring the target page's data to the current URL, but on image description pages this is done after the image itself is shown. | |||
* It can only be done once per image. | |||
==Native with configuration change== | ==Native with configuration change== | ||
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*{{mediawiki|Extension:Icon}} - image links ''(parser function)'' | *{{mediawiki|Extension:Icon}} - image links ''(parser function)'' | ||
Or you can invent your own linked image syntax, by writing an extension that registers it as a parser hook. See {{mediawiki|Manual:Tag extensions}} for information on extending MediaWiki syntax. | Or you can invent your own linked image syntax, by writing an extension that registers it as a parser hook. See {{mediawiki|Manual:Tag_extensions|Manual:Tag extensions}} for information on extending MediaWiki syntax. | ||
==Other options== | ==Other options== | ||