Example scripts

This page was printed on Oct 20, 2019. For the current version, visit https://help.shopify.com/en/manual/apps/apps-by-shopify/script-editor/examples.

Scripts are flexible and can be used to create unique and powerful discounts. For example, you can create scripts that change the prices and properties of line items in your store's cart based on the items that a customer adds to it.

You can find examples of common scripts in the script templates that are provided in the Script Editor. To view these examples, you need to create a script.

Here are some other script examples:

Percentage off all items

This line item script multiplies the price of each line item in the cart by 0.9, resulting in a 10% discount.

Input.cart.line_items.each do |item|
  item.change_line_price(item.line_price * 0.9, message: "10% off all items!")
end

Output.cart = Input.cart

Percentage off all shipping rates

This shipping script discounts all shipping rates by 0.10, resulting in a 10% discount on shipping.

Input.shipping_rates.each do |shipping_rate|
  next unless shipping_rate.source == "shopify"
  shipping_rate.apply_discount(shipping_rate.price * 0.10, message: "Discounted shipping")
end

Output.shipping_rates = Input.shipping_rates

Remove a shipping rate

This shipping script hides shipping options that start with the string EXPRESS.

Output.shipping_rates = Input.shipping_rates.delete_if do |shipping_rate|
  shipping_rate.name.upcase.start_with?("EXPRESS")
end

Rename a payment provider

The following script renames the Cash on Delivery (COD) payment provider to a custom name.

Input.payment_gateways.each do |payment_gateway|
  next unless payment_gateway.name == "Cash on Delivery (COD)"
  payment_gateway.change_name("Custom Name")
end

Output.payment_gateways = Input.payment_gateways

Stop customers from using a discount code

You can use a line item script to temporarily stop customers from applying a discount code at checkout. For example, during a Black Friday Cyber Monday sale, the following script tells your customers that their discount code can't be used:

if Input.cart.discount_code
  Input.cart.discount_code.reject(
    message: "Maximum discount already applied! Discount codes can not be used during this promotion."
  )
end

Output.cart = Input.cart

If you have a Shopify Plus plan, you can remove the Discount code field from your checkout.

To remove this field, add the following code to your checkout.liquid file.

<style>
[data-reduction-form="update"] {
  display: none
}
</style>
Ruby
# Use an array to keep track of the discount campaigns desired.
CAMPAIGNS = [
  # $5 off all items with the "sale" tag
  ItemCampaign.new(
    AndSelector.new(
      TagSelector.new("sale"),
      ExcludeGiftCardSelector.new,
    ),
    MoneyDiscount.new(5_00, "5$ off all items on sale",),
  ),

  # 10% off all items with a price lower than $100
  ItemCampaign.new(
    AndSelector.new(
      ExcludeGiftCardSelector.new,
      PriceSelector.new(:lower_than, Money.new(cents: 100_00)),
    ),
    PercentageDiscount.new(10, "10% off all items under 100$"),
  ),

  # Give every 3rd item with the tag "letter" for free
  BogoCampaign.new(
    TagSelector.new("letter"),
    PercentageDiscount.new(100, "Third item is free"),
    LowToHighPartitioner.new(2,1),
  )
]

# Iterate through each of the discount campaigns.
CAMPAIGNS.each do |campaign|
  # Apply the campaign onto the cart.
  campaign.run(Input.cart)
end

# To have the changes to the line items be reflected, the output of
# the script needs to be specified.
Output.cart = Input.cart

Buy one, get one free

This script gives one product for free if the customer purchases at least one of those products.

# Buy One, Get One Free Script
# The basis of this script is provided by the Script Editor itself as a "default" script option.

# Adjusting these values lets you tweak the scope of the discount, eg:
# PAID_ITEM_COUNT = 1, DISCOUNTED_ITEM_COUNT = 1 -> Buy One, Get One
# PAID_ITEM_COUNT = 3, DISCOUNTED_ITEM_COUNT = 2 -> Buy Three, Get Two
PAID_ITEM_COUNT = 1
DISCOUNTED_ITEM_COUNT = 1

# Specify the IDs of the products you want to be eligible for this promotion.
ELIGIBLE_PRODUCT_IDS = [9307791812, 9307791940]

# Returns the integer amount of items that must be discounted next
# given the amount of items seen
#
def discounted_items_to_find(total_items_seen, discounted_items_seen)
  Integer(total_items_seen / (PAID_ITEM_COUNT + DISCOUNTED_ITEM_COUNT) * DISCOUNTED_ITEM_COUNT) - discounted_items_seen
end

# Partitions the items and returns the discounted items.
#
# Arguments
# ---------
#
# * cart
#   The cart to which split items are added (typically Input.cart).
#
# * line_items
#   The selected items that are applicable for the campaign.
#
def partition(cart, line_items)
  # Sort the items by price from high to low
  sorted_items = line_items.sort_by{|line_item| line_item.variant.price}.reverse
  # Create an array of items to return
  discounted_items = []
  # Keep counters of items seen and discounted, to avoid having to recalculate on each iteration
  total_items_seen = 0
  discounted_items_seen = 0

  # Loop over all the items and find those to be discounted
  sorted_items.each do |line_item|
    total_items_seen += line_item.quantity
    # After incrementing total_items_seen, see if any items must be discounted
    count = discounted_items_to_find(total_items_seen, discounted_items_seen)
    # If there are none, then skip to the next item
    next if count <= 0

    if count >= line_item.quantity
      # If the full item quantity must be discounted, then add it to the items to return
      # and increment the count of discounted items
      discounted_items.push(line_item)
      discounted_items_seen += line_item.quantity
    else
      # If only part of the item must be discounted, then split the item
      discounted_item = line_item.split(take: count)
      # Insert the newly-created item in the cart, right after the original item
      position = cart.line_items.find_index(line_item)
      cart.line_items.insert(position + 1, discounted_item)
      # Add it to the list of items to return
      discounted_items.push(discounted_item)
      discounted_items_seen += discounted_item.quantity
    end
  end

  # Return the items to be discounted
  discounted_items
end

eligible_items = Input.cart.line_items.select do |line_item|
  product = line_item.variant.product
  !product.gift_card? && ELIGIBLE_PRODUCT_IDS.include?(product.id)
end

discounted_line_items = partition(Input.cart, eligible_items)
discounted_line_items.each do |line_item|
  line_item.change_line_price(Money.zero, message: "Buy one, get one free!")
end

Output.cart = Input.cart

New customer discount

This script gives a percentage discount for new customers.

DISCOUNT_AMOUNT = 20

if Input.cart.line_items.size > 1 && (Input.cart.customer.nil? || Input.cart.customer.orders_count < 1)
  line_item = Input.cart.line_items.sort_by { |line_item| line_item.variant.price }.first
  if line_item.quantity > 1
    line_item = line_item.split(take: 1)
    Input.cart.line_items << line_item
  end
  line_item.change_line_price(line_item.line_price * (1.0 - (DISCOUNT_AMOUNT / 100.0)), message: "#{DISCOUNT_AMOUNT}% off for first-time customers!")
end

Output.cart = Input.cart

Percentage off least expensive items

This script takes a percentage off the least expensive item in a cart.

DISCOUNT_AMOUNT = 15

if (Input.cart.line_items.size > 1)
  line_item = Input.cart.line_items.sort_by { |line_item| line_item.variant.price }.first
  if line_item.quantity > 1
    line_item = line_item.split(take: 1)
    Input.cart.line_items << line_item
  end
  line_item.change_line_price(line_item.line_price * (1.0 - (DISCOUNT_AMOUNT / 100.0)), message: "#{DISCOUNT_AMOUNT}% off!")
end

Output.cart = Input.cart

Tiered pricing for bulk purchases

This script can offer a higher percentage discount on a product as a customer adds more to their cart. For example, a customer receives a 5% discount for a cart with 1 to 5 products, a 10% discount on a cart with 6 to 10 products, and so on.

# Define a list of price tiers.
PRICE_TIERS = [
  # Pricing tiers for Shoes
  {
    product_types: ['Shoes'],
    group_by: :product, # :product or :variant
    tiers: [
      {
        quantity: 10,
        discount_percentage: 10,
        discount_message: '10% off for 10+'
      },
      {
        quantity: 50,
        discount_percentage: 15,
        discount_message: '15% off for 50+'
      }
    ]
  }
]

# In most cases, you don't need to edit below this line.

##
# Tiered pricing campaign.
class TieredPricingCampaign

  def initialize(partitioner, tiers)
    @partitioner = partitioner
    @tiers = tiers.sort_by { |tier| tier[:quantity] }
  end

  def run(cart)
    @partitioner.partition(cart).each do |k, items|
      total_quantity = items.map(&:quantity).reduce(0, :+)
      applicable_tier = find_tier_for_quantity(total_quantity)
      unless applicable_tier.nil?
        apply_tier_discount(items, applicable_tier)
      end
    end
  end

  private

    def find_tier_for_quantity(quantity)
      @tiers.select { |tier| tier[:quantity] <= quantity }.last
    end

    def apply_tier_discount(items, tier)
      discount = get_tier_discount(tier)
      items.each do |item|
        discount.apply(item)
      end
    end

    def get_tier_discount(tier)
      PercentageDiscount.new(tier[:discount_percentage], tier[:discount_message])
    end

end

##
# Select line items by product type.
class ProductTypeSelector

  def initialize(product_types)
    @product_types = Array(product_types).map(&:upcase)
  end

  def match?(line_item)
    @product_types.include?(line_item.variant.product.product_type.upcase)
  end

  def group_key
    @product_types.join(',')
  end

end

##
# Apply a percentage discount to a line item.
class PercentageDiscount

  def initialize(percent, message = '')
    @percent = Decimal.new(percent) / 100.0
    @message = message
  end

  def apply(item)
    line_discount = item.original_line_price * @percent
    new_line_price = item.original_line_price - line_discount
    if new_line_price < item.line_price
      item.change_line_price(new_line_price, message: @message)
    end
  end

end

##
# A pricing tier partition.
class TierPartitioner

  def initialize(selector, group_by)
    @selector = selector
    @group_by = group_by
  end

  def partition(cart)
    # Filter items
    items = cart.line_items.select { |item| @selector.match?(item) }

    # Group items using the appropriate key.
    cart.line_items.group_by { |item| group_key(item) }
  end

  private

    def group_key(line_item)
      case @group_by
        when :product
          line_item.variant.product.id
        when :variant
          line_item.variant.id
        else
          @selector.group_key
      end
    end

end

##
# Instantiate and run Price Tiers.
PRICE_TIERS.each do |pt|
  TieredPricingCampaign.new(
    TierPartitioner.new(
      ProductTypeSelector.new(pt[:product_types]),
      pt[:group_by]
    ),
    pt[:tiers]
  ).run(Input.cart)
end

##
# Export changes.
Output.cart = Input.cart

Tiered discounts by spending threshold

This script offers increasing discounts based on the increased total value of the cart. For example, a customer receives a 5% discount on an order over $50, a 10% discount on an order over $100, and so on.

# Define spending thresholds, from lowest spend to highest cart value.
SPENDING_THRESHOLDS = [
  {
    spend: 3000,   # spend amount (in cents)
    discount: 10   # percentage discount
  },
  {
    spend: 5000,
    discount: 15
  },
  {
    spend: 10000,
    discount: 20
  }
]

# Find any applicable spending threshold.
eligible_threshold = nil
SPENDING_THRESHOLDS.each do |threshold|
  if Input.cart.subtotal_price_was.cents >= threshold[:spend]
    eligible_threshold = threshold
  end
end

# Apply threshold.
if !eligible_threshold.nil?
  Input.cart.line_items.each do |line_item|
    line_item.change_line_price(line_item.line_price * (1.0 - (eligible_threshold[:discount] / 100.0)), message: "#{eligible_threshold[:discount]}% off for purchases over $#{eligible_threshold[:spend] / 100}!")
  end
end

Output.cart = Input.cart

Free gift with purchase

This script offers a free gift with a purchase. You can define how many products need to be included in a purchase for a customer to receive the free gift.

# Define the ID of the free product.
FREE_GIFT_PRODUCT_ID = 9307791812

# Check that we have at least two items in the cart (so that there's a "purchase").
if Input.cart.line_items.size > 1
  Input.cart.line_items.each do |line_item|
    # If the free gift is found, set its price to zero.
    if line_item.variant.product.id == FREE_GIFT_PRODUCT_ID
      if line_item.quantity > 1
        line_item = line_item.split(take: 1)
        Input.cart.line_items << line_item
      end
      line_item.change_line_price(Money.zero, message: "Free gift with purchase!")
    end
  end
end

# Export the cart.
Output.cart = Input.cart

Free standard shipping for a specific customer group

This script offers free shipping to a specified customer group. For example, you can use tag certain customers with VIP and then offer free shipping to those customers..

# Define a list of shipping service names that are eligible for free shipping for VIPs.
ELIGIBLE_SERVICES = ['Standard Ground Shipping']

# Define the tag that identifies VIP customers.
VIP_CUSTOMER_TAG = 'VIP'

# If the customer is a VIP, give them free shipping on the defined services.
if !Input.cart.customer.nil? and Input.cart.customer.tags.include?(VIP_CUSTOMER_TAG)
  Input.shipping_rates.each do |shipping_rate|
    if ELIGIBLE_SERVICES.include?(shipping_rate.name)
      shipping_rate.apply_discount(shipping_rate.price, message: "Free shipping for VIP customers!")
    end
  end
end

# Export the rates.
Output.shipping_rates = Input.shipping_rates

Pick up in store if a customer is close to particular location

This script lets customers pick up their order in store if their postal code prefix matches the list set in this script.

# Define the name of the pick up shipping rate - this should be added manually in the Shopify Admin.
PICKUP_SHIPPING_RATE_NAME = 'Pick Up In-Store'

# Define a list of postcode prefixes that are allowed to pick up from the store.
PICKUP_POSTCODE_PREFIXES = [
  '100', '101', '102'
]

# Output filtered shipping rates.
Output.shipping_rates = Input.shipping_rates.delete_if do |shipping_rate|
  (shipping_rate.name == PICKUP_SHIPPING_RATE_NAME) && !PICKUP_POSTCODE_PREFIXES.any? { |prefix| Input.cart.shipping_address.zip.start_with?(prefix) }
end

Percentage off next order if customer accepts marketing

This script gives a customer a percentage off their next order if they have accepted marketing when they placed their first order.

# Define the discount for eligible customers.
DISCOUNT_AMOUNT = 10

# Checks to see if this is a customer's second order, and that they opted into marketing when they placed their first order.
if (!Input.cart.customer.nil? && Input.cart.customer.orders_count == 1 && Input.cart.customer.accepts_marketing?)
  Input.cart.line_items.each do |line_item|
    line_item.change_line_price(line_item.line_price * (1.0 - (DISCOUNT_AMOUNT / 100.0)), message: "#{DISCOUNT_AMOUNT}% off for subscribing to our newsletter!")
  end
end

Output.cart = Input.cart

Auto-select default payment methods

This script auto selects a specified payment method at the checkout.

# Define the preferred order of gateways.
PREFERRED_GATEWAY_ORDER = ['Invoice', 'Shopify Payments']

# Sort gateways.
Output.payment_gateways = Input.payment_gateways.sort_by do |payment_gateway|
  PREFERRED_GATEWAY_ORDER.index(payment_gateway.name) || 999
end

Other examples

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