Unhook jQuery from WooCommerce via `functions.php`?

Question

So I am using the http://woothemes.com/woocommerce/ plugin for eCommerce and it's registering jQuery local and conflicting with my default jQuery call from Google CDN.

It took a long time but I isolated the issue to the following lines of code within woocommerce.php:

    $suffix = defined('SCRIPT_DEBUG') && SCRIPT_DEBUG ? '' : '.min';
    $lightbox_en = (get_option('woocommerce_enable_lightbox')=='yes') ? true : false;
    $chosen_en = (get_option('woocommerce_enable_chosen')=='yes') ? true : false;
    $jquery_ui_en = (get_option('woocommerce_enable_jquery_ui')=='yes') ? true : false;
    $scripts_position = (get_option('woocommerce_scripts_position') == 'yes') ? true : false;

    // Woocommerce.min.js is minified and contains woocommerce_plugins
    wp_enqueue_script( 'woocommerce', $this->plugin_url() . '/assets/js/woocommerce'.$suffix.'.js', array('jquery'), '1.0', $scripts_position );
    if ( defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ) {
        wp_enqueue_script( 'woocommerce_plugins', $this->plugin_url() . '/assets/js/woocommerce_plugins'.$suffix.'.js', array('jquery'), '1.0', $scripts_position );
    }

Deleting them cancels out the duplicate jQuery call which is causing me all my headaches. I have the following in functions.php to dequeue jQuery from the header, but for some reason, it persistsand refuses to go away! :/ Any ideas how to kill the local jQuery call from within functions.php? Is there something wrong with my code? :

// dequeue jquery from header

function theme_slug_dequeue_header_jquery() {
     wp_dequeue_script( 'jquery' );
}
add_action( 'wp_header', 'theme_slug_dequeue_header_jquery', 11 );

Answer 1

Actually it looks like your calling jquery wrong. You should always use wp_enqueue_script, otherwise your asking for conflicts. Don't call it manually.

The lines you pasted in from WooCommerce don't load jquery directly - they load it by setting the dependencies for the other scripts. WordPress handles the rest.

If you want to use jQuery from a CDN, deregister it and re-register it with the CDN version. Rather than paste you the code I'll direct you to the following example which explains how:

http://www.wpbeginner.com/wp-themes/replace-default-wordpress-jquery-script-with-google-library/

Answer 2

I was having a similar problem and stumble into this thread.

My issue was that WooCommerce 2.0.5 was registering jQuery by himself and that was breaking my own jQuery scripts, creating a conflict with my functions.php deregister/register/enqueue process.

After several attempts I noticed that I wasn't including the jQuery version in my function. After specifically adding it, the problem was solved.

This is what woocommerce/woocommerce.php does (line 1214):

public function check_jquery() {
    global $wp_scripts;

    // Enforce minimum version of jQuery
    if ( isset( $wp_scripts->registered['jquery']->ver ) && $wp_scripts->registered['jquery']->ver < '1.7' ) {
        wp_deregister_script( 'jquery' );
        wp_register_script( 'jquery', '/wp-includes/js/jquery/jquery.js', array(), '1.7' );
        wp_enqueue_script( 'jquery' );
    }
}

And this is how I override it in my functions.php file

function my_scripts_method() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 
        'jquery', 
        'http://code.jquery.com/jquery.js',
        false, 
        '1.9.1' // IMPORTANT: declare jQuery version
        );
    wp_enqueue_script( 'jquery' );
}  

add_action('wp_enqueue_scripts', 'my_scripts_method');

Hope this could help someone else :)

Answer 3

Use this code to dequeue jQuery from any plugin, assuming that is enqueues the script using the wp_enqueue_script() function.

add_action( 'wp_enqueue_scripts', 'dequeue_jquery', 999999 );

function dequeue_jquery() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js');
    wp_enqueue_script( 'jquery' );
}

The priority of 999999 causes the function to be called last, hopefully, in most cases.