Using javascript to customize the storefront

<script>
//-------------- Main --------------//

//** Create the order data array from analytics script **//
var data = parseAnalyticsData(getAnalyticsScript());
//console.log(data);

/**
 * Retrieve the order details as an object, properties are:
 * id          - The order ID.
 * shipping    - The order shipping cost. 
 * tax         - The order tax cost. 
 * shippingTax - The order shipping tax cost.
 * city        - The order shipping city.
 * state       - The order shipping state. 
 * country     - The order shipping country.
 */
var orderDetails = getOrderDetails(data);

console.log("Order ID = %d", orderDetails.id);
console.log("Order shipping city = %s", orderDetails.city);
console.log("Order subtotal = %f", orderDetails.subtotal);

/**
 * Retrieve the order product details, as an array of product objects. 
 * Properties are:
 * id          - The product ID. 
 * description - The product description.
 * tax         - The product tax cost.
 * price       - The product price per product. 
 * qty         - The product quantity purchased. 
 */
var products = getOrderProducts(data);

//** Loop through the products array to access each product **//
console.log("Total number of products = %d", products.length);
for (x=0; x<products.length; x++) {
  console.log("--------");
  console.log("Item # ", x+1);
  console.log("Product ID = %f", products[x].id);
  console.log("Product QTY = %f", products[x].qty);
  console.log("Product Price = %f", products[x].price);
  console.log("--------");
}



//-------------- Functions --------------//

/**
 * Parses the DOM to retrieve the order data analytics script.
 */
function getAnalyticsScript() {
  var scripts = document.getElementsByTagName('script');
  var thisScriptTag = scripts[scripts.length - 2];
  var data = thisScriptTag.textContent || thisScriptTag.innerText;
  return data;
}

/**
 * Parses the raw analytics script element to remove all script
 * text, and parse just the order related data into an array.
 * @param script <String> - The raw order analytics script.
 * @return <mixed> - Array containing the order data. 
 */
function parseAnalyticsData(data) {
  String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.split(search).join(replacement);
  };
  // This is hacky, and probably inefficient, but it removes all
  // script related text, so the end result is just a comma separated
  // array of the order and product data. 
  data = data.replace("if(typeof(pageTracker) != 'undefined') {", '');
  data = data.replaceAll( 'pageTracker._addTrans(', '');
  data = data.replaceAll( ' pageTracker._trackTrans();', '');
  data = data.replaceAll( 'pageTracker._addItem(', '');
  data = data.replaceAll(');', '');
  data = data.replace('}', '');
  data = data.replace( /\n/g, ",").replaceAll( ",,",",");
  data = data.replace(/\s/g,'');
  data = data.split(',');
  data = cleanArray(data); // Remove all empty values from array. 
  return data;
}

/**
 * Removes all empty data from array.
 * @param array <mixed> - The array to clean. 
 */
function cleanArray(array) {
  var newArray = new Array();
  for (var i = 0; i < array.length; i++) {
    if (array[i]) {
      newArray.push(array[i]);
    }
  }
  return newArray;
}

/**
 * Parse Analytics Data for Order Details
 * @param data <mixed> - The order analytics data.
 * @return <mixed>     - Object containing the order details. 
 */
function getOrderDetails(data) {
  String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.split(search).join(replacement);
  };
  return {
    id          : parseFloat(data[0].replaceAll("'",'')),
    subtotal    : ( parseFloat(data[2].replaceAll("'",'')) - (parseFloat(data[3].replaceAll("'",'')) + parseFloat(data[4].replaceAll("'",'')) ) ),
    total       : parseFloat(data[2].replaceAll("'",'')),
    tax         : parseFloat(data[3].replaceAll("'",'')),
    shipping    : parseFloat(data[4].replaceAll("'",'')),
    city        : data[5].replaceAll("'",''),
    state       : data[6].replaceAll("'",''),
    country     : data[7].replaceAll("'",'')
  }
}

/**
 * Parse Analytics Data for All Order Product Details.
 * @param data <mixed> - The order analytics data.
 * @return <mixed>     - Array containing individual product details.
 */
function getOrderProducts(data) {
  String.prototype.replaceAll = function(search, replacement) {
    var target = this;
    return target.split(search).join(replacement);
  };
  var counter = -1;        // Keep index of details per product.
  var productsArray = []; // Init empty array to hold all products. 
  var product = {};       // Init empty object to hold single product data. 
  //** Product data starts at index 8 **//
  for (x=8; x<data.length; x++) {
    counter++;
    switch (counter) {
      case 1:
        product.id = parseFloat(data[x].replaceAll("'",''));
        break;
      case 2:
        product.description = data[x].replaceAll("'",'');
        break;
      case 3:
        product.tax = parseFloat(data[x].replaceAll("'",''));
        break;
      case 4:
        product.price = parseFloat(data[x].replaceAll("'",''));
        break;
      case 5:
        product.qty = parseFloat(data[x].replaceAll("'",''));
        counter = -1;                 // reset counter
        productsArray.push(product); // push product to products array
        product = {};
        break;
    }
  }
  return productsArray;
}

var mainImages = [];
  var rollOvers = [];
  this.context.categoryProducts.forEach(function(e, i) {
    if (e.images[0]) {
      mainImages[e.id] = e.images[0].data;
    }
    if (e.images[1]) {
      rollOvers[e.id] = e.images[1].data;
    }
  });

  rollOvers.forEach(function(image, id) {
    image = image.replace('{:size}', '500x659');

    $('a[data-product-id="' + id + '"]').closest('li.product').find('.card-image')
      .on('mouseover', function() {
      $(this).attr('src', image);
    }).on('mouseout', function() {
      $(this).attr('src', mainImages[id].replace('{:size}', '500x659'));
    });
  });