[wp-trac] [WordPress Trac] #16734: Allowing multiple selection when using wp_dropdown_categories

[WordPress Trac]

#16734: Allowing multiple selection when using wp_dropdown_categories
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 Reporter:  grandslambert  |      Owner:
     Type:  enhancement    |     Status:  new
 Priority:  normal         |  Milestone:  Awaiting Review
Component:  General        |    Version:  3.1
 Severity:  normal         |   Keywords:  has-patch
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 I would like to be able to pass an argument to wp_dropdown_categories() to
 allow the user to select more than one category using a CTRL-CLICK. I can
 use a preg_replace to add the multiple tag to the html select tag, but I
 cannot pass multiple selections in the "selected" argument.

 I modified two files (wp-includes/category-template.php and wp-admin/css
 /wp-admin.css) to add this option and will include patches for these
 files. It adds a boolean argument for "multiple" to wp_dropdown_categories
 and uses in_array to check if terms are listed in an array in the
 "selected" argument, casting it as an array if it is not. I have tested
 this patch to work in the latest trunk (3.1).

 The change in the w-admin.css is so the multiple selection box is tall
 enough to show the slider and more than one category.

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Ticket URL: <http://core.trac.wordpress.org/ticket/16734>
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