Smooth scroll vantage

Script.js

( function($) {
  $.fn.vantageSmoothScroll = function () {
  	$( this ).click( function ( e ) {
  		var $a = $( this );
  		var $target = $( '[name=' + this.hash.slice( 1 ) + ']' ).length ? $( '[name=' + this.hash.slice( 1 ) + ']' ) : $( $a.get( 0 ).hash );

  		if ( $target.length ) {

  			var height = 0;
  			if ( $( '#masthead .site-navigation' ).hasClass( 'use-sticky-menu' ) ) {
  				height += $( '.site-navigation' ).outerHeight();
  			}
  			if ( $( 'body' ).hasClass( 'admin-bar' ) ) {
  				height += $( '#wpadminbar' ).outerHeight();
  			}

  			$( 'html, body' ).animate( {
  				scrollTop: $target.offset().top - height
  			}, 1000 );
        console.log(height);

  			return false;
  		}
  		// Scroll to the position of the item, minus the header size
  	} );
  }
	$(window).load( function() {
		// Handle smooth scrolling
    $( '#site-navigation a[href*="#"]:not([href="#"])' ).add( 'a[href*="#"]:not([href="#"])' ).not( '.lsow-tab a[href*="#"]:not([href="#"]), .wc-tabs a[href*="#"]:not([href="#"]), .iw-so-tab-title a[href*="#"]:not([href="#"]), .comment-navigation a[href*="#"]' ).vantageSmoothScroll();
	} );
} )(jQuery);

settings.php

$settings->add_field('navigation', 'smooth_scroll', 'checkbox', __('Smooth scrolling.', 'vantage'), array(
  'description' => __('Enables smooth scroll for internal anchor links.', 'vantage')
));