PmWiki | Cookbook / AttachImageSize

Summary: Generate width and height attributes for attached images

Version: 20090106

Maintainer: Petko

Categories: Images

Description

Generate width and height attributes for attached images

The default Attach: markup for attached images doesn't include the image width and height attributes in the HTML tag. This recipe makes it possible to override this, and to automatically set these attributes.

Installation

Place the following code in local/config.php :

function LinkImageSize($pagename, $imap, $path, $alt, $txt, $fmt=NULL) {
  global $FmtV, $UploadFileFmt;
  if (preg_match('!^(.*)/([^/]+)$!', $path, $match)) {
    $pagename = MakePageName($pagename, $match[1]);
    $path = $match[2];
  }
  $upname = MakeUploadName($pagename, $path);
  $filepath = FmtPageName("$UploadFileFmt/$upname", $pagename);
  $s = @getimagesize($filepath);
  $FmtV['$ImageSize'] = @$s[3];
  $r = LinkUpload($pagename, $imap, $path, $alt, $txt, $fmt);
  $FmtV['$ImageSize'] = '';
  return $r;
}
$LinkFunctions['Attach:'] = 'LinkImageSize';
$ImgTagFmt="<img src='\$LinkUrl' alt='\$LinkAlt' title='\$LinkAlt' \$ImageSize />";
$FmtV['$ImageSize'] = '';

Notes

See this message by Pm for limits of such a method. Notably:

it only works with images attached to the wiki page and displayed via Attach: markup, not with other images (external, or via Path: or http: links);
if the getimagesize() PHP function is not enabled, the attributes are not set;
if an author tries to override the size via a wikistyle, it may not work well in all browsers.

Release Notes

20090106 - first public release

Contributors

The recipe is written and maintained by Petko. Parts of code from scripts/upload.php by Pm.

Comments

See discussion at AttachImageSize-Talk

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