Apply Facebook SDK to Shopify

Getting Hands-on

  1. You should duplicate and back up your code base on Shopify. To do so, please access the admin panel of your Shopify store.
  1. Head to "Themes" under “Online Store” and duplicate your current theme.

Duplicate theme
  1. Go to “Edit code”.

Edit code
  1. Search for “theme.liquid” on the left side of the menu

Search for theme.liquid
  1. Insert the following code before the </head> tag.
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script async defer src="https://connect.facebook.net/en_US/sdk.js"></script>
<script src="https://cdn.jsdelivr.net/npm/uuid@latest/dist/umd/uuidv4.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/js-cookie@rc/dist/js.cookie.min.js"></script>
  1. Insert the following code after the above code.

Click to view code 

<script>
   function constructSessionId() {
     var sessionId = Cookies.get("sessionId")
     if (!sessionId) {
       var uuid = uuidv4()
       sessionId = uuid.replace(/-/g, '')
       Cookies.set("sessionId", sessionId)
     }
     return sessionId;
   }

   function getCookiesInterval() {
     var getCookiesHandle = window.setInterval(function () {
       var cartCookies = Cookies.get("cart")
       console.log("Cookies not found. Continue looping...")
       if (cartCookies) {
         console.log("Cookies found!")
         clearInterval(getCookiesHandle)
         updateCartCookies({ updateCart: true })
       }
     }, 5000)
    }

   function updateCartCookies({ updateCart, onPressFBButton }) {
     var sessionId = constructSessionId()
     var cartCookies = Cookies.get("cart")
     var lineItems;

     // Call Api to Update
     if (!(cartCookies || onPressFBButton)) {
       return getCookiesInterval()
     }

     window.setTimeout(function() {
       $.ajax({
         type: 'GET',
         url: '/cart.js',
         async: false,
         cache: false,
         dataType: 'json',
         success: function(data) {
           lineItems = data.items
         }
       });
       console.log('lineItems', lineItems)
       if (sessionId && cartCookies && lineItems.length > 0) {
         $.ajax({
           type: 'POST',
           url: 'https://z0jhk3u2gd.execute-api.ap-southeast-1.amazonaws.com/prod/shopifyCookiesUpdate?shopifyDomain={{STORE_DOMAIN}}',
           async: false,
           cache: false,
           data: JSON.stringify({
             sessionId: sessionId,
             cartId: cartCookies,
             updateCart: updateCart,
             lineItems: lineItems,
           })
         })
         .done((data) => {
           if (data.modified) {

           } else {

           }
         })
       }
     }, 2000)
   }

   function addToCartEvent() {
     console.log('Cart Added')
     updateCartCookies({ updateCart: true })
   }


   $(document).ready(function () {
    function onPageLoad() {
      constructSessionId()
      updateCartCookies({ updateCart: false })
    }

     onPageLoad()
     document.getElementById("AddToCart").addEventListener('click',function (){
        addToCartEvent();
    });
    // Send to Messenger Logic
    window.fbAsyncInit = function () {
      FB.init({
        appId: '2087214101500691',
        xfbml: true,
        version: "v2.6",
      });

      // Parse Send to Messenger
        (function() {
          var sessionId = constructSessionId()

          // Restock Send To Messenger is always there
          var restockDiv = $('.fb-send-to-messenger-restock-container');
          if (restockDiv.length > 0) {
            var restockMessenger = $('.fb-send-to-messenger-restock-container .fb-send-to-messenger');
            var dataRef = restockMessenger.attr("data-ref");
            var dataRefArray = dataRef.split('_');
            var newDataRef = dataRefArray[0] + "_" + dataRefArray[1] + "_" + sessionId;
            restockMessenger.attr("data-ref", newDataRef);
            FB.XFBML.parse(document.getElementsByClassName('fb-send-to-messenger-restock-container')[0]);
          }
          // Product Send To Messenger
          var productTagDiv = $('.fb-send-to-messenger-product-tag-container')
          if (productTagDiv.length > 0) {
            productTagDiv.each((index, div) => {
              var productTagMessenger = $(div).find(".fb-send-to-messenger");
              var dataRef = productTagMessenger.attr("data-ref");
              var dataRefArray = dataRef.split('_');
              var newDataRef = dataRefArray[0] + "_" + dataRefArray[1] + "_" + sessionId;
              productTagMessenger.attr("data-ref", newDataRef);
              FB.XFBML.parse(document.getElementsByClassName('fb-send-to-messenger-product-tag-container')[index]);
            })
          }
        })()

        FB.Event.subscribe('send_to_messenger', function(e) {
          console.log(e)
          if (e.event === "opt_in") {
            console.log("Clicked Send To Messenger Plugin")
            updateCartCookies({ updateCart: true, onPressFBButton: true })
          }
        });
    };
   })
</script>

  1. Replace {{STORE_DOMAIN}} in the above code with the real domain of your store.

  2. Search for “product-template.liquid” in the left side of the menu.

Search for product-template.liquid
  1. Insert the following code after <div class="product-form__item product-form__item--submit>...</div> block:
{% if product.available == false %}
 <!-- Restock Send To Messenger -->
 <div class="fb-send-to-messenger-restock-container {% unless current_variant.available %}variant-not-available{% endunless %}">
  <div style="display: flex; flex-direction: column; font-size: 12px;">
   <div style="margin-bottom: 4px; font-size: 15px;">Let me know when it is in stock!</div>
   <div id="fb-send-to-messenger-restock"
    class="fb-send-to-messenger"
    messenger_app_id="2087214101500691"
    page_id={{PAGE_ID}}
    data-ref="STOCK_{{ current_variant.id }}"
    color="blue"
    size="large"
    ></div>
   </div>
  </div>
{% endif %}
  1. Insert the below code before <div class="product-single__description rte"> {{ product.description }} </div> block:
        {% if product.tags contains 'WAITING_SALE' %}
          <div class="fb-send-to-messenger-product-tag-container">
            <div style="display: flex; flex-direction: column; font-size: 12px;">
              <div style="margin-bottom: 4px; font-size: 15px;">Notify me when there is a sale!</div>
              <div id="fb-send-to-messenger-product-tag"
                   class="fb-send-to-messenger"
                   messenger_app_id="2087214101500691"
                   page_id={{PAGE_ID}}
                   data-ref="SALE_{{ current_variant.id }}"
                   color="blue"
                   size="large"
                   ></div>
            </div>
          </div>
        {% endif %}
        {% if product.tags contains 'COUPON' %}
          <div class="fb-send-to-messenger-product-tag-container">
            <div style="display: flex; flex-direction: column; font-size: 12px;">
              <div style="margin-bottom: 4px; font-size: 15px;">I would like to receive a coupon code</div>
              <div id="fb-send-to-messenger-product-tag"
                   class="fb-send-to-messenger"
                   messenger_app_id="2087214101500691"
                   page_id={{PAGE_ID}}
                   data-ref="COUPON_{{ current_variant.id }}"
                   color="blue"
                   size="large"
                   ></div>
            </div>
          </div>
        {% endif %}

  1. Replace the {{PAGE_ID}} in the above code with your real Facebook page ID.

  2. Add id="AddToCart" after <button type="submit" name="add".

  3. You are all set! You may proceed to build the messenger chatbot for Shopify.

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