agregar al carrito HTML CSS ejemplo de código JavaScript

Ejemplo: código para agregar al carrito mediante javascript

// Appends the required hidden values to PayPal's form before submitting

populatePayPalForm: function() {
    var self = this;
    if( self.$paypalForm.length ) {
        var $form = self.$paypalForm;
        var cart = self._toJSONObject( self.storage.getItem( self.cartName ) );
        var shipping = self.storage.getItem( self.shippingRates );
        var numShipping = self._convertString( shipping );
        var cartItems = cart.items;
        var singShipping = Math.floor( numShipping / cartItems.length );

        $form.attr( "action", self.paypalURL );
        $form.find( "input[name="business"]" ).val( self.paypalBusinessEmail );
        $form.find( "input[name="currency_code"]" ).val( self.paypalCurrency );

        for( var i = 0; i < cartItems.length; ++i ) {
            var cartItem = cartItems[i];
            var n = i + 1;
            var name = cartItem.product;
            var price = cartItem.price;
            var qty = cartItem.qty;

            $( "<div/>" ).html( "<input type="hidden" name="quantity_" + n + "" value="" + qty + ""/>" ).
            insertBefore( "#paypal-btn" );
            $( "<div/>" ).html( "<input type="hidden" name="item_name_" + n + "" value="" + name + ""/>" ).
            insertBefore( "#paypal-btn" );
            $( "<div/>" ).html( "<input type="hidden" name="item_number_" + n + "" value="SKU " + name + ""/>" ).
            insertBefore( "#paypal-btn" );
            $( "<div/>" ).html( "<input type="hidden" name="amount_" + n + "" value="" + self._formatNumber( price, 2 ) + ""/>" ).
            insertBefore( "#paypal-btn" );
            $( "<div/>" ).html( "<input type="hidden" name="shipping_" + n + "" value="" + self._formatNumber( singShipping, 2 ) + ""/>" ).
            insertBefore( "#paypal-btn" );

        }

    }
}

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