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// This is the listener that will receive the post message from your front-end JS in case of an error. window.addEventListener("message", function (e) { // We verify that the error message is coming from Piano, so it must be what we're looking for. if (typeof e.data.piano != 'undefined') { // Get the object with the result. var result = e.data.piano; // We know how this object should be structured, so we're checking for the "success" field. // We're expecting it to be false, so we can show an error message. if (!result.success) { // Append the text message into the block. $(".error-msg").text(result.message); } else { $(".thank-you-pop").toggleClass('ng-hide'); } } return; }, false);