wp_nav_menu: show menu only if one exists, otherwise show nothing

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I’m trying to use wp_nav_menu to only display a menu if one exists, otherwise, display nothing.

If I delete the menu, it will output a list of the pages.

My functions.php file contains:

if (function_exists('register_nav_menus')) {
register_nav_menus (
array('main_nav' => 'Main Navigation Menu'));}

How can I use wp_nav_menu to only display a menu if one exists, otherwise show nothing?

4

Use has_nav_menu(), and test for theme_location, rather than menu_id:

<?php
if ( has_nav_menu( $theme_location ) ) {
    // User has assigned menu to this location;
    // output it
    wp_nav_menu( array( 
        'theme_location' => $theme_location, 
        'menu_class' => 'nav', 
        'container' => '' 
    ) );
}
?>

You can output alternate content, by adding an else clause.

EDIT

You need to replace $theme_location with your actual theme_location:

<?php
if ( has_nav_menu( 'main_nav' ) ) {
    // User has assigned menu to this location;
    // output it
    wp_nav_menu( array( 
        'theme_location' => 'main_nav', 
        'menu_class' => 'nav', 
        'container' => '' 
    ) );
}
?>

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