Clerk.js allows you to write custom javascript functions, that adds new functionality to the Designs.

Formatters should be inserted as a configuration for Clerk.js, in the tracking script that is inserted on all pages.

For Magento 1 this file contains the tracking-script:

app->design->frontend->base->default->template->clerk->tracking.phtml

An example can be seen below. Please be aware this is for Clerk V2 (latest version):

<!-- Start of Clerk.io E-commerce Personalisation tool - www.clerk.io -->
  <script type="text/javascript">
    (function(w,d){
      var e=d.createElement('script');e.type='text/javascript';e.async=true;
      e.src=(d.location.protocol=='https:'?'https':'http')+'://cdn.clerk.io/clerk.js';
      var s=d.getElementsByTagName('script')[0];s.parentNode.insertBefore(e,s);
      w.__clerk_q=w.__clerk_q||[];w.Clerk=w.Clerk||function(){w.__clerk_q.push(arguments)};
    })(window,document);

    Clerk('config', {
      key: 'O7UITkJIXqXibeQF9ONobiGGKYYKtbvh',
      formatters: {
                form_key: function () {
                    return '<?php echo $this->getFormKey(); ?>';
                },
                price_in_currency: function(price) {
                    price =  Math.round(price * 100) / 100;
                    var price_converted = Math.round((price * <?php echo (float)$rates[$currentCurrencyCode]; ?>) * 100) / 100;
                    var retVal = <?php echo json_encode($currentCurrencySymbol); ?> + ' ' + price_converted.toFixed(2).toString();

                    return retVal;
                },
                log_price: function(price) {
                   console.log(price);
                }
            }
        });
    };
    (function(){
  </script>

    <!-- End of Clerk.io E-commerce Personalisation tool - www.clerk.io -->
    

You can write any number of Formatters, separated by comma:

formatters: {
   log_price: function(price) {
      console.log(price);
   },
   calculate_discount: function(price,special_price) {
      return price-special_price;
   },
   substring: function(text) {
      var short_string = text.substring(0,20);
      return short_string;
   }          
}

After creating your Formatters, you can use them in your Designs using this syntax:

{{ x  formatter | attribute }} {{ x | formatter | attribute1 | attribute2 }}

This allows you to create any functionality in your Designs that you require.

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