JAVASCRIPT

how to access parent function from iframe

document.getElementById('targetFrame').contentWindow.targetFunction();

send response from iframe to parent

window.top.postMessage('hello', '*')

send response from iframe to parent

window.onmessage = function(e) {
    if (e.data == 'hello') {
        alert('It works!');
    }
};

send response from iframe to parent

myIframe.contentWindow.postMessage('hello', '*');