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

TemplateFormatters 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:

<script type="text/javascript">
    window.clerkAsyncInit = function() {
        Clerk.config({
            key: '<?php echo $this->getPublicKey(); ?>',
            collect_email: <?php echo $this->collectEmails() ? 'true' : 'false'; ?>,
            templateFormatters: {
                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(){
        var e = document.createElement('script'); e.type='text/javascript'; e.async = true;
        e.src = document.location.protocol + '//api.clerk.io/static/clerk.js';
        var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(e, s);
    })();
</script>

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

templateFormatters: {
   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 TemplateFormatters, you can use them in your Designs using this syntax:

{{ formatter attribute }} {{ formatter attribute1 attribute2 }}

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

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