I've been following this tutorial - http://www.youtube.com/watch?v=R2hOvZ7bwXU, which explains how to use postMessage to securely pass a message between iframe and parent - you basically end up with something like this - http://html5demos.com/postmessage2

My problem is that I need it to work the opposite way round (child to parent) and don't know how to target the parent window.

this is my receiver code (in the parent):

function handleMsg(e) {

    if(e.origin == "http://uc.dialogue.net") {

        let blah = e.data;

        alert(blah);    

    } else {

        alert("error");

    }

}

addEventListener("message", handleMsg, true);

and this is the sender function that is triggered by a simple form (in child):

   let text = document.querySelector('.srchInput').value;

   window.parent.postMessage(text, "http://uc.dialogue.net");   

Should I be targeting the parent in a different way?

Cheers
Paul