hlavnistrana

class HlavniStrana {

	public function __construct() {

		if ( is_admin() ) {
			add_action( 'load-post.php',     array( $this, 'init_metabox' ) );
			add_action( 'load-post-new.php', array( $this, 'init_metabox' ) );
		}

	}

	public function init_metabox() {

		add_action( 'add_meta_boxes',        array( $this, 'add_metabox' )         );
		add_action( 'save_post',             array( $this, 'save_metabox' ), 10, 2 );

	}

	public function add_metabox() {

		add_meta_box(
			'hlavnistrana',
			__( 'Informace na hlavní straně', 'text_domain' ),
			array( $this, 'render_metabox' ),
			'post',
			'advanced',
			'default'
		);

	}

	public function render_metabox( $post ) {

		// Retrieve an existing value from the database.
		$tabor_podnadpis = get_post_meta( $post->ID, 'tabor_podnadpis', true );
		$tabor_vyber = get_post_meta( $post->ID, 'tabor_vyber', true );
		$tabor_obrazek = get_post_meta( $post->ID, 'tabor_obrazek', true );

		// Set default values.
		if( empty( $tabor_podnadpis ) ) $tabor_podnadpis = '';
		if( empty( $tabor_vyber ) ) $tabor_vyber = '';
		if( empty( $tabor_obrazek ) ) $tabor_obrazek = '';

		// Form fields.
		echo '<table class="form-table">';

		echo '	<tr>';
		echo '		<th><label for="tabor_podnadpis" class="tabor_podnadpis_label">' . __( 'Podnadpis', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="text" id="tabor_podnadpis" name="tabor_podnadpis" class="tabor_podnadpis_field" placeholder="' . esc_attr__( '', 'text_domain' ) . '" value="' . esc_attr__( $tabor_podnadpis ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="tabor_vyber" class="tabor_vyber_label">' . __( 'Zobrazit výběr z', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		wp_dropdown_categories( array( 'id' => 'tabor_vyber', 'name' => 'tabor_vyber', 'class' => 'tabor_vyber_field', 'selected' => $tabor_vyber ) );
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="tabor_obrazek" class="tabor_obrazek_label">' . __( 'Obrázek sekce o nás', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="url" id="tabor_obrazek" name="tabor_obrazek" class="tabor_obrazek_field" placeholder="' . esc_attr__( '', 'text_domain' ) . '" value="' . esc_attr__( $tabor_obrazek ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '</table>';

	}

	public function save_metabox( $post_id, $post ) {

		// Sanitize user input.
		$tabor_new_podnadpis = isset( $_POST[ 'tabor_podnadpis' ] ) ? sanitize_text_field( $_POST[ 'tabor_podnadpis' ] ) : '';
		$tabor_new_vyber = isset( $_POST[ 'tabor_vyber' ] ) ? sanitize_text_field( $_POST[ 'tabor_vyber' ] ) : '';
		$tabor_new_obrazek = isset( $_POST[ 'tabor_obrazek' ] ) ? esc_url( $_POST[ 'tabor_obrazek' ] ) : '';

		// Update the meta field in the database.
		update_post_meta( $post_id, 'tabor_podnadpis', $tabor_new_podnadpis );
		update_post_meta( $post_id, 'tabor_vyber', $tabor_new_vyber );
		update_post_meta( $post_id, 'tabor_obrazek', $tabor_new_obrazek );

	}

}

new HlavniStrana;