One of the big problems my site staff has had with tags is the overwhelming number of similar or duplicate tags, due to the write-in ability.
I’m about to add new custom taxonomies to my site for them to use, but I’d like to avoid the problem we had with tags. I’m curious to know if I can turn off write-ins, so they can only be added manually through that taxonomy’s part of the admin area. It’s non-hierarchical, so they can still type in and the system will auto-complete and search for tags they might be looking for, which is great. I just don’t want them to be able to create new tags from the post screen.
Is this possible? I was looking at the Taxonomies and register_taxonomy() pages in the Codex, and thought maybe the “rewrite” function might be what I’m looking for, but I don’t think it is now.
1 Answer
Here is what I came up with, seems to work:
add_filter( 'pre_post_tags_input', 'no_tags_input_create' );
add_filter( 'pre_post_tax_input', 'no_tax_input_create' );
function no_tags_input_create($tags_input) {
$output = array();
foreach( $tags_input as $tag )
if( term_exists( $tag, 'post_tag') )
$output[] = $tag;
return $output;
}
function no_tax_input_create($tax_input) {
if( !isset($tax_input['post_tag']) )
return $tax_input;
$output = array();
$tags = explode(',', $tax_input['post_tag']);
foreach( $tags as $tag )
if( term_exists( $tag, 'post_tag') )
$output[] = $tag;
$tax_input['post_tag'] = implode(',',$output);
return $tax_input;
}
This is for tags, you can easily extend second function to handle custom taxonomies.