finlabsindia/wp-content/plugins/jetpack/modules/widgets/contact-info/contact-info-admin.js

(function( $ ) {
	$( document ).on( 'change', '.jp-contact-info-showmap', function() {
		var $checkbox = $( this ),
			isChecked = $checkbox.is( ':checked' );

		$checkbox.closest( '.widget' ).find( '.jp-contact-info-apikey' ).toggle( isChecked );
	});
})( window.jQuery );