Thêm chức năng tìm kiếm category khi đăng bài

<?php
function search_categories_meta_box( $post, $box ) {
    $defaults = array( 'taxonomy' => 'category' );
    if ( ! isset( $box['args'] ) || ! is_array( $box['args'] ) ) {
        $args = array();
    } else {
        $args = $box['args'];
    }
    $r = wp_parse_args( $args, $defaults );
    $tax_name = esc_attr( $r['taxonomy'] );
    $taxonomy = get_taxonomy( $r['taxonomy'] );
    ?>
    <script type="text/javascript">
        jQuery(document).ready(function(){
            jQuery('#catSearch').keyup(function() {
                var val = jQuery('#catSearch').val(),
                    lis = jQuery("#<?php echo $tax_name;?>checklist li");
                lis.hide();
                // find li labels's containing term, then back to parent li
                var containingLabels = jQuery("#<?php echo $tax_name;?>checklist label:contains('" + val + "')");
                console.log(containingLabels.text());
                containingLabels.closest('li').find('li').andSelf().show();
                containingLabels.parents('#<?php echo $tax_name;?>checklist li').show();
            });
        });
    </script>
    <div id="taxonomy-<?php echo $tax_name; ?>" class="categorydiv">
        Search: <input id="catSearch" type="text" value="" />
        <ul id="<?php echo $tax_name; ?>-tabs" class="category-tabs">
            <li class="tabs"><a href="#<?php echo $tax_name; ?>-all"><?php echo $taxonomy->labels->all_items; ?></a></li>
            <li class="hide-if-no-js"><a href="#<?php echo $tax_name; ?>-pop"><?php _e( 'Most Used' ); ?></a></li>
        </ul>

        <div id="<?php echo $tax_name; ?>-pop" class="tabs-panel" style="display: none;">
            <ul id="<?php echo $tax_name; ?>checklist-pop" class="categorychecklist form-no-clear" >
                <?php $popular_ids = wp_popular_terms_checklist( $tax_name ); ?>
            </ul>
        </div>

        <div id="<?php echo $tax_name; ?>-all" class="tabs-panel">
            <?php
            $name = ( $tax_name == 'category' ) ? 'post_category' : 'tax_input[' . $tax_name . ']';
            echo "<input type='hidden' name='{$name}[]' value='0' />"; // Allows for an empty term set to be sent. 0 is an invalid Term ID and will be ignored by empty() checks.
            ?>
            <ul id="<?php echo $tax_name; ?>checklist" data-wp-lists="list:<?php echo $tax_name; ?>" class="categorychecklist form-no-clear">
                <?php wp_terms_checklist( $post->ID, array( 'taxonomy' => $tax_name, 'popular_cats' => $popular_ids,'checked_ontop' => true ) ); ?>
            </ul>
        </div>
        <?php if ( current_user_can( $taxonomy->cap->edit_terms ) ) : ?>
            <div id="<?php echo $tax_name; ?>-adder" class="wp-hidden-children">
                <h4>
                    <a id="<?php echo $tax_name; ?>-add-toggle" href="#<?php echo $tax_name; ?>-add" class="hide-if-no-js">
                        <?php
                        /* translators: %s: add new taxonomy label */
                        printf( __( '+ %s' ), $taxonomy->labels->add_new_item );
                        ?>
                    </a>
                </h4>
                <p id="<?php echo $tax_name; ?>-add" class="category-add wp-hidden-child">
                    <label class="screen-reader-text" for="new<?php echo $tax_name; ?>"><?php echo $taxonomy->labels->add_new_item; ?></label>
                    <input type="text" name="new<?php echo $tax_name; ?>" id="new<?php echo $tax_name; ?>" class="form-required form-input-tip" value="<?php echo esc_attr( $taxonomy->labels->new_item_name ); ?>" aria-required="true"/>
                    <label class="screen-reader-text" for="new<?php echo $tax_name; ?>_parent">
                        <?php echo $taxonomy->labels->parent_item_colon; ?>
                    </label>
                    <?php wp_dropdown_categories( array( 'taxonomy' => $tax_name, 'hide_empty' => 0, 'name' => 'new' . $tax_name . '_parent', 'orderby' => 'name', 'hierarchical' => 1, 'show_option_none' => '&mdash; ' . $taxonomy->labels->parent_item . ' &mdash;' ) ); ?>
                    <input type="button" id="<?php echo $tax_name; ?>-add-submit" data-wp-lists="add:<?php echo $tax_name; ?>checklist:<?php echo $tax_name; ?>-add" class="button category-add-submit" value="<?php echo esc_attr( $taxonomy->labels->add_new_item ); ?>" />
                    <?php wp_nonce_field( 'add-' . $tax_name, '_ajax_nonce-add-' . $tax_name, false ); ?>
                    <span id="<?php echo $tax_name; ?>-ajax-response"></span>
                </p>
            </div>
        <?php endif; ?>
    </div>
    <?php
}
 
function update_collection_box() {
    remove_meta_box( 'categorydiv', 'post', 'side');
    add_meta_box('customcategorydiv', 'Categories', 'search_categories_meta_box', 'post', 'side', 'core', array( 'taxonomy' => 'category' ));
}
 
add_filter('admin_menu', 'update_collection_box');