execute.js

var loopGa = window.setInterval(function(){
       
      if(typeof ga !== 'undefined' ) {
          ga('require', 'ec');
          ga('ec:addProduct', {
          'id': '<?php echo $product_info["product_id"]?>',
          'name': '<?php echo $product_info["name"]?>',         
          });
          ga('ec:setAction', 'detail');
          ga('send', 'pageview');
          clearInterval(loopGa);
      }
  
}, 200);