For add Custom Meta Field in taxonomy use following code in your current themes functions.php file.
<?php
// Add term page
add_action( 'category_add_form_fields', 'cxc_taxonomy_add_new_meta_field', 10, 2 );
function cxc_taxonomy_add_new_meta_field() {
// this will add the custom meta field to the add new term page
?>
<div class="form-field">
<label for="custom_term_meta"><?php _e( 'Custom meta field', 'cxc-codexcoach' ); ?></label>
<input type="text" name="custom_term_meta" id="custom_term_meta" value="">
<p class="description"><?php _e( 'Enter a value for this field','cxc-codexcoach' ); ?></p>
</div>
<?php
}
?>
Edit with term page
<?php
// Edit term page
add_action( 'category_edit_form_fields', 'cxc_taxonomy_edit_meta_field', 10, 2 );
function cxc_taxonomy_edit_meta_field( $term ) {
// put the term ID into a variable
$term_id = $term->term_id;
// retrieve the existing value(s) for this meta field. This returns an array
$term_meta = get_term_meta( $term_id, 'custom_term_meta', true ); ?>
<tr class="form-field">
<th scope="row" valign="top"><label for="custom_term_meta]"><?php _e( 'Example meta field', 'cxc-codexcoach' ); ?></label></th>
<td>
<input type="text" name="custom_term_meta" id="custom_term_meta" value="<?php echo ( !empty($term_meta) ) ? $term_meta : ''; ?>">
<p class="description"><?php _e( 'Enter a value for this field','cxc-codexcoach' ); ?></p>
</td>
</tr>
<?php
}
?>
Save extra taxonomy fields
<?php
// Save extra taxonomy fields callback function.
add_action( 'edited_category', 'cxc_save_taxonomy_custom_meta', 10, 2 );
add_action( 'create_category', 'cxc_save_taxonomy_custom_meta', 10, 2 );
function cxc_save_taxonomy_custom_meta( $term_id ) {
if ( isset( $_POST['custom_term_meta'] ) && !empty( $_POST['custom_term_meta'] ) ) {
update_term_meta( $term_id, 'custom_term_meta', $_POST['custom_term_meta'] );
}
}
?>
Use below code to show metabox values from anywhere
<?php
$terms = get_the_terms( get_the_ID() , 'category' ); // Here Specify your taxonomy name
if( !empty( $terms ) ){ ?>
<ul>
<?php foreach ( $terms as $term ) {
$custom_term_meta = get_term_meta($term->term_id, 'custom_term_meta', true);
if(!empty($custom_term_meta)) { ?>
<li><?php echo $custom_term_meta; ?>
<?php } } ?>
</ul>
<?php } ?>