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Stop the 'rel' field in menu system from filtering characters

I'm looking to see if it's possible to stop the 'Link Relationship (XFN)' field in the WP 3+ menu system from stripping characters.

Specifically, I'm trying to pass a hex color through that field which requires the use of a hashtag at the front of the 6 digit color code. For example, the color '#cccccc' is being outputted as 'cccccc'. The hashtag is required for what I'm trying to do.

Is it possible to change the filter of the 'rel' field so that it allows for the hashtag to go through?

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beowulf | 06/12/11 at 2:25pm Edit


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  • avatar
    Last edited:
    06/12/11
    2:33pm
    Caroline Keim says:

    Can you show us the code you're trying to use?

    • 06/12/11 2:42pm

      beowulf says:

      I'm not sure how that's relevant. Wordpress is stripping out everything from the 'Link Relationship (XFN)' field other than standard characters regardless of the code I'm using.

    • 06/12/11 2:49pm

      Caroline Keim says:

      I was going to say it's relevant, because we could add a script to add the # after Wordpress removed it.

    • 06/12/11 2:55pm

      beowulf says:

      Ah, yes. I see your point now. :)

      The only thing is that I'm not sure that I want to paste it here. It's a jQuery function that I'd rather keep out of the public domain for now.

  • avatar
    Last edited:
    06/12/11
    2:49pm
    Utkarsh Kukreti says:

    WordPress is splitting the xfn value by a space, and then running the `sanitize_html_class` function over it, which strips anything but alphanumeric characters.

    wp-includes/nav-menu.php
    

    
$args['menu-item-xfn'] = implode( ' ', array_map( 'sanitize_html_class', explode( ' ', $args['menu-item-xfn'] ) ) );


    There are no filters around that, so the only way I can think of doing this, if you _really_ want to, is by commenting out this line.

    Edit:

    sanitize_html_class does have a filter. One way is to not filter any class that starts with a # sign. Let me know if that would work for you.

    Previous versions of this answer: 06/12/11 at 2:49pm | 06/12/11 at 2:49pm

    • 06/12/11 2:53pm

      beowulf says:

      Interesting.

      I definitely wouldn't want to make changes to core WP files (it would just be overwritten on the next upgrade anyway).

      A function would be ideal although I'm not really sure how to go about that.

    • 06/12/11 2:57pm

      Utkarsh Kukreti says: 

      add_filter( 'sanitize_html_class', 'dont_filter_hash', 10, 2 );
      
function dont_filter_hash($sanitized, $raw) {
      
  if(preg_match("/^#[0-9a-fA-F]{6}$/", $raw)) {
      
    return $raw;
      
  } else { 
      
    return $sanitized;
      
  } 
      
}


      This code will not filter any hex value, with the format "#abcdef".

    • 06/12/11 3:05pm

      beowulf says:

      Nice!! That filter totally worked! :)

    • 06/12/11 3:07pm

      beowulf says:

      You just made my night with that. Ok, now I need to mark it as answered. Thanks again!

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