Or, embed this snippet using GenerateWP WordPress Plugin.

Download

Clone

Owl Button Metabox

class Owl_Button_Meta_Box {

	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(
			'owl_button',
			__( 'Owl Button', 'text_domain' ),
			array( $this, 'render_metabox' ),
			'owl_post_type',
			'side',
			'core'
		);

	}

	public function render_metabox( $post ) {

		// Retrieve an existing value from the database.
		$owlbutton_button-text = get_post_meta( $post->ID, 'owlbutton_button-text', true );
		$owlbutton_button-url = get_post_meta( $post->ID, 'owlbutton_button-url', true );

		// Set default values.
		if( empty( $owlbutton_button-text ) ) $owlbutton_button-text = '';
		if( empty( $owlbutton_button-url ) ) $owlbutton_button-url = '';

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

		echo '	<tr>';
		echo '		<th><label for="owlbutton_button-text" class="owlbutton_button-text_label">' . __( 'Button Text', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="text" id="owlbutton_button-text" name="owlbutton_button-text" class="owlbutton_button-text_field" placeholder="' . esc_attr__( '', 'text_domain' ) . '" value="' . esc_attr__( $owlbutton_button-text ) . '">';
		echo '			<p class="description">' . __( 'Leave blank to disable button', 'text_domain' ) . '</p>';
		echo '		</td>';
		echo '	</tr>';

		echo '	<tr>';
		echo '		<th><label for="owlbutton_button-url" class="owlbutton_button-url_label">' . __( 'Button URL', 'text_domain' ) . '</label></th>';
		echo '		<td>';
		echo '			<input type="url" id="owlbutton_button-url" name="owlbutton_button-url" class="owlbutton_button-url_field" placeholder="' . esc_attr__( '', 'text_domain' ) . '" value="' . esc_attr__( $owlbutton_button-url ) . '">';
		echo '		</td>';
		echo '	</tr>';

		echo '</table>';

	}

	public function save_metabox( $post_id, $post ) {

		// Sanitize user input.
		$owlbutton_new_button-text = isset( $_POST[ 'owlbutton_button-text' ] ) ? sanitize_text_field( $_POST[ 'owlbutton_button-text' ] ) : '';
		$owlbutton_new_button-url = isset( $_POST[ 'owlbutton_button-url' ] ) ? esc_url( $_POST[ 'owlbutton_button-url' ] ) : '';

		// Update the meta field in the database.
		update_post_meta( $post_id, 'owlbutton_button-text', $owlbutton_new_button-text );
		update_post_meta( $post_id, 'owlbutton_button-url', $owlbutton_new_button-url );

	}

}

new Owl_Button_Meta_Box;