A script for Ecwid to determine a product ID of a product page being displayed

ecw_get_productid.js

// Add handler for Ecwid's OnPageLoad event
if (
  typeof(Ecwid) == 'object'
  && typeof(Ecwid.OnPageLoad) == 'object'
) {
  Ecwid.OnPageLoad.add(function(page) {
    // Determine a product ID and do necessary actions
    if (
      typeof(page) == 'object'
      && 'PRODUCT' == page.type
    ) {
      alert(page.productId);
    }
  });
}