A CodePen by Justin Klemm. Shopping Cart Challenge - Built for the Rodeo Season #2, Week #3 Challenge: "A Shopping Cart" All functionality and calculations are implemented via Javascript. There are responsive breakpoints at 650px and 350px (though you can't view the latter in Chrome because it won't scale down below 400px). Breakpoints are based…

cart.html

<h1>Shopping Cart</h1>

<div class="shopping-cart">

  <div class="column-labels">
    <label class="product-image">Image</label>
    <label class="product-details">Product</label>
    <label class="product-price">Price</label>
    <label class="product-quantity">Quantity</label>
    <label class="product-removal">Remove</label>
    <label class="product-line-price">Total</label>
  </div>

  <div class="product">
    <div class="product-image">
      <img src="http://s.cdpn.io/3/dingo-dog-bones.jpg">
    </div>
    <div class="product-details">
      <div class="product-title">Dingo Dog Bones</div>
      <p class="product-description">The best dog bones of all time. Holy crap. Your dog will be begging for these things! I got curious once and ate one myself. I'm a fan.</p>
    </div>
    <div class="product-price">12.99</div>
    <div class="product-quantity">
      <input type="number" value="2" min="1">
    </div>
    <div class="product-removal">
      <button class="remove-product">
        Remove
      </button>
    </div>
    <div class="product-line-price">25.98</div>
  </div>

  <div class="product">
    <div class="product-image">
      <img src="http://s.cdpn.io/3/large-NutroNaturalChoiceAdultLambMealandRiceDryDogFood.png">
    </div>
    <div class="product-details">
      <div class="product-title">Nutro™ Adult Lamb and Rice Dog Food</div>
      <p class="product-description">Who doesn't like lamb and rice? We've all hit the halal cart at 3am while quasi-blackout after a night of binge drinking in Manhattan. Now it's your dog's turn!</p>
    </div>
    <div class="product-price">45.99</div>
    <div class="product-quantity">
      <input type="number" value="1" min="1">
    </div>
    <div class="product-removal">
      <button class="remove-product">
        Remove
      </button>
    </div>
    <div class="product-line-price">45.99</div>
  </div>

  <div class="totals">
    <div class="totals-item">
      <label>Subtotal</label>
      <div class="totals-value" id="cart-subtotal">71.97</div>
    </div>
    <div class="totals-item">
      <label>Tax (5%)</label>
      <div class="totals-value" id="cart-tax">3.60</div>
    </div>
    <div class="totals-item">
      <label>Shipping</label>
      <div class="totals-value" id="cart-shipping">15.00</div>
    </div>
    <div class="totals-item totals-item-total">
      <label>Grand Total</label>
      <div class="totals-value" id="cart-total">90.57</div>
    </div>
  </div>
      
      <button class="checkout">Checkout</button>

</div>

script.js

/* Set rates + misc */
var taxRate = 0.05;
var shippingRate = 15.00; 
var fadeTime = 300;


/* Assign actions */
$('.product-quantity input').change( function() {
  updateQuantity(this);
});

$('.product-removal button').click( function() {
  removeItem(this);
});


/* Recalculate cart */
function recalculateCart()
{
  var subtotal = 0;
  
  /* Sum up row totals */
  $('.product').each(function () {
    subtotal += parseFloat($(this).children('.product-line-price').text());
  });
  
  /* Calculate totals */
  var tax = subtotal * taxRate;
  var shipping = (subtotal > 0 ? shippingRate : 0);
  var total = subtotal + tax + shipping;
  
  /* Update totals display */
  $('.totals-value').fadeOut(fadeTime, function() {
    $('#cart-subtotal').html(subtotal.toFixed(2));
    $('#cart-tax').html(tax.toFixed(2));
    $('#cart-shipping').html(shipping.toFixed(2));
    $('#cart-total').html(total.toFixed(2));
    if(total == 0){
      $('.checkout').fadeOut(fadeTime);
    }else{
      $('.checkout').fadeIn(fadeTime);
    }
    $('.totals-value').fadeIn(fadeTime);
  });
}


/* Update quantity */
function updateQuantity(quantityInput)
{
  /* Calculate line price */
  var productRow = $(quantityInput).parent().parent();
  var price = parseFloat(productRow.children('.product-price').text());
  var quantity = $(quantityInput).val();
  var linePrice = price * quantity;
  
  /* Update line price display and recalc cart totals */
  productRow.children('.product-line-price').each(function () {
    $(this).fadeOut(fadeTime, function() {
      $(this).text(linePrice.toFixed(2));
      recalculateCart();
      $(this).fadeIn(fadeTime);
    });
  });  
}


/* Remove item from cart */
function removeItem(removeButton)
{
  /* Remove row from DOM and recalc cart total */
  var productRow = $(removeButton).parent().parent();
  productRow.slideUp(fadeTime, function() {
    productRow.remove();
    recalculateCart();
  });
}

style.scss

@import "compass";
/*
I wanted to go with a mobile first approach, but it actually lead to more verbose CSS in this case, so I've gone web first. Can't always force things...

Side note: I know that this style of nesting in SASS doesn't result in the most performance efficient CSS code... but on the OCD/organizational side, I like it. So for CodePen purposes, CSS selector performance be damned.
*/

/* Global settings */
$color-border: #eee;
$color-label: #aaa;
$font-default: 'HelveticaNeue-Light', 'Helvetica Neue Light', 'Helvetica Neue', Helvetica, Arial, sans-serif;
$font-bold: 'HelveticaNeue-Medium', 'Helvetica Neue Medium';


/* Global "table" column settings */
.product-image { float: left; width: 20%; }
.product-details { float: left; width: 37%; }
.product-price { float: left; width: 12%; }
.product-quantity { float: left; width: 10%; }
.product-removal { float: left; width: 9%; }
.product-line-price { float: left; width: 12%; text-align: right; }


/* This is used as the traditional .clearfix class */
.group:before,
.group:after {
    content: '';
    display: table;
} 
.group:after {
    clear: both;
}
.group {
    zoom: 1;
}


/* Apply clearfix in a few places */
.shopping-cart, .column-labels, .product, .totals-item {
  @extend .group;
}


/* Apply dollar signs */
.product .product-price:before, .product .product-line-price:before, .totals-value:before {
  content: '$';
}


/* Body/Header stuff */
body {
  padding: 0px 30px 30px 20px;
  font-family: $font-default;
  font-weight: 100;
}

h1 {
  font-weight: 100;
}

label {
  color: $color-label;
}

.shopping-cart {
  margin-top: -45px;
}


/* Column headers */
.column-labels {
  label {
    padding-bottom: 15px;
    margin-bottom: 15px;
    border-bottom: 1px solid $color-border;
  }
  
  .product-image, .product-details, .product-removal {
    text-indent: -9999px;
  }
}


/* Product entries */
.product {
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 1px solid $color-border;
  
  .product-image {
    text-align: center;
    img {
      width: 100px;
    }
  }
  
  .product-details {
    .product-title {
      margin-right: 20px;
      font-family: $font-bold;
    }
    .product-description {
      margin: 5px 20px 5px 0;
      line-height: 1.4em;
    }
  }
  
  .product-quantity {
    input {
      width: 40px;
      
    }
  }
  
  .remove-product {
    border: 0;
    padding: 4px 8px;
    background-color: #c66;
    color: #fff;
    font-family: $font-bold;
    font-size: 12px;
    border-radius: 3px;
  }
  
  .remove-product:hover {
    background-color: #a44;
  }
}


/* Totals section */
.totals {
  .totals-item {
    float: right;
    clear: both;
    width: 100%;
    margin-bottom: 10px;
    
    label {
      float: left;
      clear: both;
      width: 79%;
      text-align: right;
    }
    
    .totals-value {
      float: right;
      width: 21%;
      text-align: right;
    }
  }
  
  .totals-item-total {
    font-family: $font-bold;
  }
}

.checkout {
  float: right;
  border: 0;
  margin-top: 20px;
  padding: 6px 25px;
  background-color: #6b6;
  color: #fff;
  font-size: 25px;
  border-radius: 3px;
}

.checkout:hover {
  background-color: #494;
}

/* Make adjustments for tablet */
@media screen and (max-width: 650px) {
  
  .shopping-cart {
    margin: 0;
    padding-top: 20px;
    border-top: 1px solid $color-border;
  }
  
  .column-labels {
    display: none;
  }
  
  .product-image {
    float: right;
    width: auto;
    img {
      margin: 0 0 10px 10px;
    }
  }
  
  .product-details {
    float: none;
    margin-bottom: 10px;
    width: auto;
  }
  
  .product-price {
    clear: both;
    width: 70px;
  }
  
  .product-quantity {
    width: 100px;
    input {
      margin-left: 20px;
    }
  }
  
  .product-quantity:before {
    content: 'x';
  }
  
  .product-removal {
    width: auto;
  }
  
  .product-line-price {
    float: right;
    width: 70px;
  }
  
}


/* Make more adjustments for phone */
@media screen and (max-width: 350px) {
  
  .product-removal {
    float: right;
  }
  
  .product-line-price {
    float: right;
    clear: left;
    width: auto;
    margin-top: 10px;
  }
  
  .product .product-line-price:before {
    content: 'Item Total: $';
  }
  
  .totals {
    .totals-item {
      label {
        width: 60%;
      }
      
      .totals-value {
        width: 40%;
      }
    }
  }
}