WooCommerce - auto update total price when quantity changed

Question

I\'ve been searching for several days but I have no answer yet. Basically, I\'m trying to replace woocommerce standart \"update cart\" button with ajax call, which automatic

Answer 1

Here's a simpler way of achieving this. All credit goes to Reigel Gallarde.

// we are going to hook this on priority 31, so that it would display below add to cart button.
add_action( 'woocommerce_single_product_summary', 'woocommerce_total_product_price', 31 );
function woocommerce_total_product_price() {
    global $woocommerce, $product;
    // let's setup our divs
    echo sprintf('<div id="product_total_price" style="margin-bottom:20px;display:none">%s %s</div>',__('Product Total:','woocommerce'),'<span class="price">'.$product->get_price().'</span>');
    echo sprintf('<div id="cart_total_price" style="margin-bottom:20px;display:none">%s %s</div>',__('Cart Total:','woocommerce'),'<span class="price">'.$product->get_price().'</span>');
    ?>
        <script>
            jQuery(function($){
                var price = <?php echo $product->get_price(); ?>,
                    current_cart_total = <?php echo $woocommerce->cart->cart_contents_total; ?>,
                    currency = '<?php echo get_woocommerce_currency_symbol(); ?>';

                $('[name=quantity]').change(function(){
                    if (!(this.value < 1)) {
                        var product_total = parseFloat(price * this.value),
                        cart_total = parseFloat(product_total + current_cart_total);

                        $('#product_total_price .price').html( currency + product_total.toFixed(2));
                        $('#cart_total_price .price').html( currency + cart_total.toFixed(2));
                    }
                    $('#product_total_price,#cart_total_price').toggle(!(this.value <= 1));

                });
            });
        </script>
    <?php
}

Answer 2

Since WooCommerce 2.6.0, released June 2016, WooCommerce cart page uses Ajax to update cart totals after clicking on Update cart button. WooCommerce 2.6.0 requires WP 4.4 or newer.

No need to worry about backend and creating your own Ajax call, the one assigned to Update cart button can be used.

To get this functionality out of the box, you can use my free plugin, which also has some handy additional options:

Ajax Cart AutoUpdate for WooCommerce

Or use child theme to do the following. Hide Update cart button and then enqueue script which triggers default update cart event on cart page quantity change (works both for cart and mini-cart widget). Use template redirect hook, dependency with jQuery and make sure that this script loads only on cart page.

To hide button with CSS, use class .button instead of tag, to keep it compatible with all WooCommerce versions:

.button[name='update_cart'] {
    display: none!important;
}

Or hide button with PHP head style:

add_action('wp_head', 'hide_update_cart_button', 20);
function hide_update_cart_button() {
    echo "<style>.button[name='update_cart']{ display: none!important;}</style>";
}

Enqueue script in dependency with jQuery:

add_action( 'template_redirect', 'auto_update_cart_totals' );
function auto_update_cart_totals() {    
    if (! is_cart() ) return; // Only if it's cart page.
    // Enqueue js file.
    add_action( 'wp_enqueue_scripts', 'my_cart_autoupdate' );           
}

function my_cart_autoupdate( ) {
    // Here goes code to hide CSS button if you decide to use PHP solution for styling.

    wp_enqueue_script( 'my-cart-autoupdate', 'path-to-js-file-its-name-and-extension', array('jquery'), '', true);
}

The most important and usually overlooked thing about jQuery code is to set update delay, 1000 in this example, my plugin allows to change this value in settings. If user changes quantity again during this delay, it will be reset to full duration. If it's not implemented and you change quantity from 1 to 10 by clicking on increment button, it will trigger 9 Ajax calls instead of 1. Place this in .js file:

var timeout;

jQuery('div.woocommerce').on('change keyup mouseup', 'input.qty', function(){ // keyup and mouseup for Firefox support
    if (timeout != undefined) clearTimeout(timeout); //cancel previously scheduled event
    if (jQuery(this).val() == '') return; //qty empty, instead of removing item from cart, do nothing
    timeout = setTimeout(function() {
        jQuery('[name="update_cart"]').trigger('click');
    }, 1000 );
});

Answer 3

It's because you are updating all your cart, not just a product.

First you need to send the item cart hash (it's not a security hash, but the product hash with all the product variation) on the javascript script:

var item_hash = $( this ).attr( 'name' ).replace(/cart\[([\w]+)\]\[qty\]/g, "$1");
var data = {
        action: 'rf_update_total_price',
        security: rf_cart_params.rf_update_total_price_nonce,
        quantity: currentVal,
        hash : item_hash 
    };

Then you can edit your function update_total_price, I've simplified ;)

function update_total_price() {

    // Skip product if no updated quantity was posted or no hash on WC_Cart
    if( !isset( $_POST['hash'] ) || !isset( $_POST['quantity'] ) ){
        exit;
    }

    $cart_item_key = $_POST['hash'];

    if( !isset( WC()->cart->get_cart()[ $cart_item_key ] ) ){
        exit;
    }

    $values = WC()->cart->get_cart()[ $cart_item_key ];

    $_product = $values['data'];

    // Sanitize
    $quantity = apply_filters( 'woocommerce_stock_amount_cart_item', apply_filters( 'woocommerce_stock_amount', preg_replace( "/[^0-9\.]/", '', filter_var($_POST['quantity'], FILTER_SANITIZE_NUMBER_INT)) ), $cart_item_key );

    if ( '' === $quantity || $quantity == $values['quantity'] )
        exit;

    // Update cart validation
    $passed_validation  = apply_filters( 'woocommerce_update_cart_validation', true, $cart_item_key, $values, $quantity );

    // is_sold_individually
    if ( $_product->is_sold_individually() && $quantity > 1 ) {
        wc_add_notice( sprintf( __( 'You can only have 1 %s in your cart.', 'woocommerce' ), $_product->get_title() ), 'error' );
        $passed_validation = false;
    }

    if ( $passed_validation ) {
        WC()->cart->set_quantity( $cart_item_key, $quantity, false );
    }

    // Recalc our totals
    WC()->cart->calculate_totals();
    woocommerce_cart_totals();
    exit;
}