WordPress: add check-boxes to custom taxonomy add/edit form - php

Question

I need to add a list of check-boxes to custom taxonomy add/edit form.
I have this code for adding a text field for custom taxonomy form in my plugin and it works fine:
<?php
function taxonomy_edit_meta_field($term) {
$t_id = $term->term_id;
$term_meta = get_option( "taxonomy_$t_id" );
?>
<tr class="form-field">
<th scope="row" valign="top"><label for="term_meta[custom_term_meta]"><?php _e( 'Term:' ); ?></label></th>
<td>
<input type="text" name="term_meta[custom_term_meta]" id="term_meta[custom_term_meta]" value="<?php echo esc_attr( $term_meta['custom_term_meta'] ) ? esc_attr( $term_meta['custom_term_meta'] ) : ''; ?>">
</td>
</tr>
<?php
}
add_action( 'product_cat_edit_form_fields', 'taxonomy_edit_meta_field', 10, 2 );
function save_taxonomy_custom_meta( $term_id ) {
if ( isset( $_POST['term_meta'] ) ) {
$t_id = $term_id;
$term_meta = get_option( "taxonomy_$t_id" );
$cat_keys = array_keys( $_POST['term_meta'] );
foreach ( $cat_keys as $key ) {
if ( isset ( $_POST['term_meta'][$key] ) ) {
$term_meta[$key] = $_POST['term_meta'][$key];
}
}
update_option( "taxonomy_$t_id", $term_meta );
}
}
add_action( 'edited_product_cat', 'save_taxonomy_custom_meta', 10, 2 );
add_action( 'create_product_cat', 'save_taxonomy_custom_meta', 10, 2 );
How I can add a list of check-boxes in the same way?

Answer 1

There were a problem with the saving not checked check-box input.
I have fixed it with input type="hidden" with the same value of "name" attribute, as in check-box input.
<tr class="form-field">
<th scope="row" valign="top"><label for="term_meta[custom_term_meta]"><?php _e( 'Color:' ); ?></label></th>
<td>
<input type="hidden" value="0" name="term_meta[pa_color_attr]">
<input type="checkbox" <?php echo (!empty($term_meta['pa_color_attr']) ? ' checked="checked" ' : 'test'); ?> value="1" name="term_meta[pa_color_attr]" />
</td>
</tr>

Answer 2

you need to change the name of the hook.
add_action( 'edited_custom_tax', 'save_taxonomy_custom_meta', 10, 2 );