Adding Fields to the Category, Tag and Custom Taxonomy Edit Screen in the WordPress Admin?

Question

The question is "How do I add one or more fields to the Category, Tag and Custom Taxonomy Edit Screen in the WordPress Admin?" This question was asked on the wp-hackers list August 1st 2010 and I offered a solution later that day. The original asker discussed the issue again today (Aug 21) which reminded me of the solution. Since it could be a common need I decided to post the solution including code up here for others to find in the future.

Answer 1

I added new field 'picture' (input type file) to category with help of these

add_action('category_edit_form_fields','category_edit_form_fields');
add_action('category_edit_form', 'category_edit_form');
add_action('category_add_form_fields','category_edit_form_fields');
add_action('category_add_form','category_edit_form');


function category_edit_form() {
?>
<script type="text/javascript">
jQuery(document).ready(function(){
jQuery('#edittag').attr( "enctype", "multipart/form-data" ).attr( "encoding", "multipart/form-data" );
        });
</script>
<?php 
}

function category_edit_form_fields () {
?>
    <tr class="form-field">
            <th valign="top" scope="row">
                <label for="catpic"><?php _e('Picture of the category', ''); ?></label>
            </th>
            <td>
                <input type="file" id="catpic" name="catpic"/>
            </td>
        </tr>
        <?php 
    }

You are free to use any taxonomy, just replace category to your taxonomy name

Answer 2

...also if you want to add that field into the custom taxonomy form you just substitute category with the custom taxonomy name in the add_action function. Example:

add_action('{custom_taxonomy}_edit_form_fields','category_edit_form_fields'); add_action('{custom_taxonomy}_edit_form', 'category_edit_form'); add_action('{custom_taxonomy}_add_form_fields','category_edit_form_fields'); add_action('{custom_taxonomy}_add_form','category_edit_form');

Answer 3

You need to add your code in to your themes functions.php file - also if you want to add that field into the custom taxonomy form you just substitute category with the custom taxonomy name in the add_action function. Example : add_action('category_edit_form_fields','category_edit_form_fields'); will be add_action('custom_taxonomy_name_form_fields','function_name_to_hook_on');

Answer 4

I use the Category Meta PLugin. Works on all custom taxonomy's, tags & categorys