[Klaviyo Integration] Klaviyo signup form & BIS #klaviyo

back-in-stock-custom.html

<button type="button" class="btn klaviyo-bis-trigger-custom" {% if product.selected_or_first_available_variant.available %}style="display: none;"{% endif %}>Notify me when available</button>

<div
  id="KlaviyoBIS-{{ product.id }}"
  class="modal modal--square modal--mobile-friendly klaviyo-bis-popup"
  data-product-id="{{ product.id }}"
>
  <div class="modal__inner">
    <div class="modal__centered medium-up--text-center">
      <div class="modal__centered-content">

        <div class="klaviyo-bis">
          <h2>{{ product.title }}</h2>
          
          <p>{{ 'products.back_in_stock.popup_body_content' | t  }}</p>

          <div class="form-vertical" style="padding-top: 15px;">
            <form action="#" class="klaviyo-bis-form-custom">
              <input type="hidden" name="subscribe_for_newsletter" value="true">
              <input type="hidden" name="platform" value="shopify">
              <input type="hidden" name="g" value="RzPhNs"> <!-- lst id -->
              <input type="hidden" name="a" value="QQyd2Z"> <!-- pub api key -->

              <input type="hidden" name="product" value="{{ product.id }}">
              <div {% if product.variants.size == 1 %}style="display: none;"{% endif %}>
                <label for="KlaviyoBIS-{{ product.id }}--variants">Options</label>
                <select id="KlaviyoBIS-{{ product.id }}--variants" name="variant" class="variants" style="width: 100%;">
                  {%- for v in product.variants -%}
                  {%- unless v.available -%}
                  <option value="{{ v.id }}">{{ v.title }}</option>
                  {%- endunless -%}
                  {%- endfor -%}
                </select>
              </div>

              <label for="KlaviyoBIS-{{ product.id }}--name">Name</label>
              <input type="tel" id="KlaviyoBIS-{{ product.id }}--name" class="input-full" name="name" value="{% if customer %}{{ customer.first_name | default: '' }} {{ customer.last_name | default: '' }}{% endif %}">


              <label for="KlaviyoBIS-{{ product.id }}--name">Email *</label>
              <input type="email" id="KlaviyoBIS-{{ product.id }}--email" class="input-full" name="email" autocorrect="off" autocapitalize="off" value="" required>

              <label for="KlaviyoBIS-{{ product.id }}--phone">Phone Number</label>
              <input type="tel" id="KlaviyoBIS-{{ product.id }}--phone" class="input-full" name="phone_number" pattern="[0-9\-]*" value="{% if customer %}{{ customer.phone | default: '' }}{% endif %}">
              
              <div class="completed_message alert" style="display: none;">{{ 'products.back_in_stock.subscription_success_label' | t  }} <a href="#" role="button" class="text-close js-modal-close">Close</a></div>
              <div class="error_message alert" style="display: none;"></div>
          
              <button class="btn submit-btn" style="width: 100%;">{{ 'products.back_in_stock.popup_button_label' | t  }}</button>
            </form>
          </div>

          <!-- <button type="button" class="text-close js-modal-close">Close</button> -->

        </div>
      </div>

      <button type="button" class="modal__close js-modal-close text-link">
        <svg aria-hidden="true" focusable="false" role="presentation" class="icon icon-close" viewBox="0 0 64 64"><path d="M19 17.61l27.12 27.13m0-27.12L19 44.74"/></svg>
        <span class="icon__fallback-text">{{ 'general.accessibility.close_modal' | t | json }}</span>
      </button>
    </div>
  </div>
</div>

<script>
  (function() {
    function domReady(fn) {
      // If we're early to the party
      document.addEventListener("DOMContentLoaded", fn);
      // If late; I mean on time.
      if (document.readyState === "interactive" || document.readyState === "complete" ) {
        fn();
      }
    }

    let pid = {{ product.id }};
    let currentVId = {{ product.selected_or_first_available_variant.id }};
    
  domReady(function() {
    let id = 'KlaviyoBIS-' + pid
    let modal = new theme.Modals(id, id)
    let modalElement = document.getElementById(id)

    let productSection = document.getElementById('ProductSection-' + pid)
     if (productSection) {
       let trigger = productSection.querySelector('.klaviyo-bis-trigger-custom')
       let bisForm = productSection.querySelector('.klaviyo-bis-form-custom')
       let submitBtn = bisForm.querySelector('.submit-btn')
       let bisFormVariants = bisForm.querySelector('.variants')
       let succEl = bisForm.querySelector('.completed_message')
       let errEl = bisForm.querySelector('.error_message')

       let variantOptionsArray = Array.from(bisFormVariants.options)

       productSection.addEventListener('variantChange', e => {
         let variant = e.detail.variant
         let available = variant.available
         currentVId = variant.id

         if (!available) {
           trigger.style.display = 'block'
         } else {
           trigger.style.display = 'none'
         }
       })
       
       trigger.addEventListener('click', function() {
         bisFormVariants.selectedIndex = variantOptionsArray.findIndex(x => x.value == currentVId)
         modal.open();
       })
       
       bisForm.addEventListener('submit', e => {
         console.log('submit')
         e.preventDefault();
         e.stopPropagation();
         
         if (bisForm.checkValidity()) {
           postFormData()
         }
       })
       
       function postFormData() {
         succEl.style.display = 'none'
         errEl.style.display = 'none'
         var formData = new FormData(bisForm);
         
         var data = {};
         formData.forEach((value, key) => {
           value = typeof value === 'string' ? value.trim() : value
           if (value) {
             if (key == 'name') {
               let nameParts = value.split(' ')
               if (nameParts[0]) {
                 data.$first_name = nameParts[0]
               }
               if (nameParts[1]) {
                 data.$last_name = nameParts[1]
               }
             } else {               
               data[key] = value;
             }
           }
         });
         
         console.log(data)
         if (!data.email || !data.variant || !data.product) {
           return
         }

         // data.variant = 1338281066525
         // data.product = 114834341917

         submitBtn.setAttribute('disabled', 'true')
         fetch("https://a.klaviyo.com/onsite/components/back-in-stock/subscribe", {
           "headers": {
             "accept": "*/*",
             "accept-language": "en-US,en;q=0.9",
             "content-type": "application/x-www-form-urlencoded",
           },
           "body": objToStrUrlEncode(data),
           "method": "POST",
           "mode": "cors",
           "credentials": "omit"
         })
         .then(r => r.json())
         .then(r => {
           if (r.status == 200 || r.success) {
             succEl.style.display = 'block'
             submitBtn.style.display = 'none'
             
             subscribeToList(data)

           } else {
             errEl.innerHTML = r.message
             errEl.style.display = 'block'
             submitBtn.removeAttribute('disabled')
           }
         })
       }
       
       function subscribeToList(data) {
         let newData = { $email: data.email, a: data.a, g: data.g, $fields: [] }

         if (data.$first_name) {
           newData.$first_name = data.$first_name
           newData.$fields.push('$first_name')
         }
         if (data.$last_name) {
           newData.$last_name = data.$last_name
           newData.$fields.push('$last_name')
         }

         if (data.phone_number) {
           newData.$phone_number = data.phone_number
           newData.$fields.push('$phone_number')
         }
         newData.$fields = newData.$fields.join(',')
         
         fetch("https://a.klaviyo.com/ajax/subscriptions/subscribe", {
           "headers": {
             "accept": "*/*",
             "accept-language": "en-US,en;q=0.9",
             "access-control-allow-headers": "*",
             "content-type": "application/x-www-form-urlencoded; charset=UTF-8",
           },
           "referrer": "https://help.klaviyo.com/",
           "referrerPolicy": "strict-origin-when-cross-origin",
           "body": objToStrUrlEncode(newData),
           "method": "POST",
           "mode": "cors",
           "credentials": "omit"
         })
       }
       
       function objToStrUrlEncode(obj) {
         const str = [];
         for (var key in obj) {
           if (obj.hasOwnProperty(key) && typeof obj[key] !== 'undefined') {
             str.push(encodeURIComponent(key) + "=" + encodeURIComponent(obj[key]))                  
           }
         }
         return str.join('&')
       }
    }
  })
  })();
</script>

Glad you found it useful! You can ping me if you get stuck or need any pointers.