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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8'>
</head>
<body>
<script>
const MY_ORIGIN = window.location.origin;
const CROSS_ORIGIN = "https://example.org";
// Creates an iframe with message channel to trigger window open and focus
window.createIframe = function(id, crossOrigin = false) {
return new Promise(resolve => {
const origin = crossOrigin ? CROSS_ORIGIN : MY_ORIGIN;
let iframe = document.createElement("iframe");
iframe.id = id;
iframe.src = origin + window.location.pathname;
iframe.onload = () => resolve(iframe);
document.body.appendChild(iframe);
});
}
window.sendMessage = function(destWin, msg) {
return new Promise(resolve => {
let channel = new MessageChannel();
channel.port1.onmessage = resolve;
destWin.postMessage(msg, "*", [channel.port2]);
});
}
window.onMessage = function(event) {
let canReply = event.ports && !!event.ports.length;
if(event.data === "open") {
window.popup = window.open('https://example.com', '', 'top=0,height=1, width=300');
if (canReply) event.ports[0].postMessage('opened');
} else if(event.data === "focus") {
window.popup.focus();
if (canReply) event.ports[0].postMessage('focused');
}
}
window.addEventListener('message', window.onMessage);
</script>
</body>
</html>
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