Is there a way to add a TinyMCE editor to the taxonomy description field on the term editing pages? The solution here (Can you add the visual editor to the description field for custom taxonomies?) no longer works, I think because the wp_tiny_mce function has been deprecated.
2 s
You can use a {$taxonomy}_edit_form_fields action hook to add html to the term edit table. In that HTML you can remove description textarea and add tinymce editor
add_action("{$taxonomy}_edit_form_fields", 'add_form_fields_example', 10, 2);
function add_form_fields_example($term, $taxonomy){
?>
<tr valign="top">
<th scope="row">Description</th>
<td>
<?php wp_editor(html_entity_decode($term->description), 'description', array('media_buttons' => false)); ?>
<script>
jQuery(window).ready(function(){
jQuery('label[for=description]').parent().parent().remove();
});
</script>
</td>
</tr>
<?php
}