[Shopify] Combine all variant quantities from product json.

gistfile1.js

(function($) {
    // get json data from product
    var totalStock = function(json, selector) {
        // caching
        var $el = typeof(selector) ? $(selector) : 'undefined',
            i = 0,
            qty = 0,
            product_json = json,
            variant,
            variants,
            threshold;

        for (i ; i < product_json.length ; i++) {
            // grab the current product and it's variants
            variants =  product_json[i].variants;

            // for every variant total overall quantities
            variant = variants.every(function(value, index, arr){
                qty += value.inventory_quantity;
                if (value >= threshold) {
                    return false;
                }
                return true;
            });

            // append the total quantity into the element
            $($el[i]).append('x '+qty);

            // reset the qty to zero so we aren't just incrementing
            // the last value set
            qty = 0;
        }
        return;
    };

    // totalStock takes two arguments
        // First argument is the collection of products you want to get, or all etc
        // Second is the selector that you want the total quantity to appear in
    $(document).ready( totalStock({{ collections[settings.frontpage_collection].products | json }}, $('.product__available') ) );
})(jQuery);