Showing a different menu in Primary Navigation location conditionally in Genesis

functions.php

<?php
//* Do NOT include the opening php tag

add_action( 'genesis_before', 'sk_replace_menu_in_primary' );
/**
 * Conditionally replace Custom Menu in Primary Navigation.
 *
 * @author Sridhar Katakam
 * @link http://sridharkatakam.com/conditionally-replace-navigation-menu-genesis/
 */
function sk_replace_menu_in_primary() {

	if( is_page( 'about' ) ) { // Put your conditional here
		add_filter( 'wp_nav_menu_args', 'replace_menu_in_primary' );
	}

}

function replace_menu_in_primary( $args ) {
	if ( $args['theme_location'] == 'primary' ) {
		$args['menu'] = 'About Page Menu'; // Name of the custom menu that you would like to display in Primary Navigation location when the condition in earlier function is met
	}
	return $args;
}

How exactly do I use this code? What do I replace and where do I put it in wordpress?

Thanks!

@asodipo

Place the code in child/active theme's functions.php.

You need to replace

1. if( is_page( 'about' ) ) {

with the if conditional where you want to display another nav menu in the Primary Navigation location.

For example:

Changing it to

if ( is_home() ) {

will display the menu you're going to set in L21 when you visit your Posts page (the Page set at Settings > Reading).

2. About Page Menu in

$args['menu'] = 'About Page Menu';

with the name of the custom menu you'd like to be shown in the Primary Navigation location when on the page set in #1 above.

Thank you, it worked perfectly. I replaced is_page with !is_front_page because I needed a different menu for all pages but the front page.