Jobhunt - Job Header Search Hierarchical Dropdown

functions.php

if ( ! function_exists( 'jobhunt_job_header_search_block' ) ) {
    /**
     * Display Job Header Search block
     */
    function jobhunt_job_header_search_block( $args = array() ) {

        $defaults =  apply_filters( 'jobhunt_job_header_search_block_args', array(
            'section_title'             => esc_html__( 'Explore Thousand Of Jobs With Just Simple Search...', 'jobhunt' ),
            'sub_title'                 => '',
            'search_placeholder_text'   => esc_html__( 'Job title, keywords or company name', 'jobhunt' ),
            'location_placeholder_text' => esc_html__( 'City, province or region', 'jobhunt' ),
            'category_select_text'      => esc_html__( 'Any Category', 'jobhunt' ),
            'show_category_select'      => false,
            'search_button_icon'        => 'la la-search',
            'search_button_text'        => esc_html__( 'Search', 'jobhunt' ),
            'show_browse_button'        => false,
            'browse_button_label'       => esc_html__( 'Or browse job offers by', 'jobhunt' ),
            'browse_button_text'        => esc_html__( 'Category', 'jobhunt' ),
            'browse_button_link'        => '#'
        ) );

        $args = wp_parse_args( $args, $defaults );

        extract( $args );

        $jobs_page_id = jh_wpjm_get_page_id( 'jobs' );
        $jobs_page_url = get_permalink( $jobs_page_id );

        ?><div class="job-search-block">

            <?php do_action( 'jobhunt_job_header_search_block_before' ); ?>

            <?php if ( ! empty( $section_title ) || ! empty( $sub_title ) ) : ?>
            <div class="section-header">
                <?php if ( ! empty( $section_title ) ) : ?>
                    <h3 class="section-title"><?php echo esc_html( $section_title ); ?></h3>
                <?php endif; ?>
                <?php if ( ! empty( $sub_title ) ) : ?>
                    <span class="section-sub-title"><?php echo esc_html( $sub_title ); ?></span>
                <?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="job-search-form">
                <form method="GET" action="<?php echo esc_url( $jobs_page_url ); ?>">
                    <div class="job-search-keywords">
                        <label class="sr-only" for="search_keywords"><?php echo esc_html__( 'Keywords', 'jobhunt' ); ?></label>
                        <input type="text" id="search_keywords" name="search_keywords" placeholder="<?php echo esc_attr( $search_placeholder_text ); ?>"/>
                    </div>
                    <?php if ( jobhunt_is_astoundify_job_manager_regions_activated() && get_option( 'job_manager_regions_filter' ) ) : ?>
                        <div class="job-search-location region-location">
                            <label class="sr-only" for="filter_job_listing_region"><?php echo esc_html__( 'Region', 'jobhunt' ); ?></label>
                            <?php wp_dropdown_categories( array('taxonomy' => 'job_listing_region', 'show_option_all' => ' Select Region', 'hierarchical' => 1, 'name' => 'filter_job_listing_region','id' => 'search_category','class' => 'jobhunt-job-region-select','value_field' => 'name','orderby' => 'name' ) ); ?>
                        </div>
                    <?php else : ?>
                        <div class="job-search-location">
                            <label class="sr-only" for="search_location"><?php echo esc_html__( 'Location', 'jobhunt' ); ?></label>
                            <input type="text" id="search_location" name="search_location" placeholder="<?php echo esc_attr( $location_placeholder_text ); ?>"/>
                        </div>
                    <?php endif; ?>
                    <?php if ( $show_category_select && taxonomy_exists( 'job_listing_category' ) ) : ?>
                    <div class="job-search-category">
                        <label class="sr-only" for="search_category"><?php echo esc_html__( 'Category', 'jobhunt' ); ?></label>
                        <?php wp_dropdown_categories( array( 'taxonomy' => 'job_listing_category', 'show_option_all' => $category_select_text, 'hierarchical' => 1, 'depth' => 0, 'name' => 'search_category', 'id' => 'search_category', 'value_field' => 'name', 'orderby' => 'name' ) ); ?>
                    </div>
                    <?php endif; ?>
                    <div class="job-search-submit">
                        <button type="submit" value="<?php echo esc_attr( $search_button_text ); ?>"><i class="<?php echo esc_attr( $search_button_icon ); ?>"></i><span class="job-search-text"><?php echo esc_html( $search_button_text ); ?></span></button>
                    </div>
                </form>
                <?php if ( $show_browse_button ) : ?>
                    <div class="browse-jobs-by-category">
                        <span><?php echo esc_html( $browse_button_label ); ?></span>
                        <a href="<?php echo esc_url( $browse_button_link ); ?>" title="<?php echo esc_attr( $browse_button_text ); ?>"><?php echo esc_html( $browse_button_text ); ?></a>
                    </div>
                <?php endif; ?>
            </div>
            
            <?php do_action( 'jobhunt_job_header_search_block_after' ); ?>

        </div><?php
    }
}