'fallback_cb' => false.. Not Working!

You might try something like this:

<?php
	$menu_args = array(
		'fallback_cb' => false,
		'container' => 'div',
		'container_class' => ' widget_wrap widget_nav_menu',
		'theme_location' => 'primary',
		'menu' => get_post_meta( $post->ID, 'MenuName', true)
	);

	if( isset( $field_value ) && ! empty( $field_value ) ) {
		wp_nav_menu( $menu_args );
	}

?>

Obviously you’ll need to change $field_value to the proper variable name.

Let me know if that works ??

No luck.. I still see the main menu on the homepage on all other pages without custom field. Is my code/syntax correct?

<?php  $menu_args = array(
		'fallback_cb' => false,
		'container' => 'div',
		'container_class' => ' widget_wrap widget_nav_menu',
		'theme_location' => 'primary',
		'menu' => get_post_meta( $post->ID, 'MenuName', true)
	);
 	$field_value = 'MenuName';
	if( isset( $field_value ) && ! empty( $field_value ) ) {
		wp_nav_menu( $menu_args );
	}
?>

Can you run this code and then paste the output of the two var_dump() calls?

echo '<pre>';
var_dump( $post-ID );
var_dump( get_post_meta( $post->ID, 'MenuName', true) )
echo '</pre>';

$menu_args = array(
        'fallback_cb' => false,
        'container' => 'div',
        'container_class' => ' widget_wrap widget_nav_menu',
        'theme_location' => 'primary',
        'menu' => get_post_meta( $post->ID, 'MenuName', true)
);

$field_value = 'MenuName';

if( isset( $field_value ) && ! empty( $field_value ) ) {
        wp_nav_menu( $menu_args );
}

Sure. I get the following on my homepage:
int(1)
string(0) “”

Ah ha! There’s the problem. Your custom field is empty. In the menu args array can you the get_post_meta() with the value you are expecting to be returned and then post your findings?

Sorry I’m confused… I thought I wanted it to be empty so that the fallback will kick in.. I am not expecting a value on the homepage bc I have no custom menu for it.

You’re right. I got confused for a moment about what the end goal was. I apologize ??

Yes, you do want the get_post_meta() to return an empty string on the home page. I think a quick restructuring of the code will fix all of this:

<?php  

	$field_name = get_post_meta( $post->ID, 'MenuName', true);

	# $field_name will be an empty string
	# if the custom field doesn't exist
	# for this page.

	if( '' != $field_name ) {

		$menu_args = array(
			'fallback_cb' => false,
			'container' => 'div',
			'container_class' => ' widget_wrap widget_nav_menu',
			'theme_location' => 'primary',
			'menu' => $field_name
		);

		wp_nav_menu( $menu_args );
	}
?>

Fixed…You’re Awesome!! Thanks so much for your help!

You’re absolutely welcome. Sorry for the confusing posts ??

Resolved!