Javascript open new tab, and wait for it to close

Question

I want to open a new tab for a bank payment on my website using javascript, and without the main window navigating away,

when the user is back from the bank payment to a

Answer 1

The best approach with data transfer from the child window I found.

Parent code

window.open(url);
await new Promise(resolve => window.addEventListener('custom', resolve));

Child code

if(window.opener) {
  const customEvent = new CustomEvent('custom', { detail: {} });
  window.opener.dispatchEvent(customEvent);
  window.close();
}

Answer 2

Before closing the popup, try opener.someFunction() to call a function in the window that opened it. Note that this will fail if the user closed the first window, or if the user navigated it to another site, or if the two windows are on different domains for whatever reason.

Answer 3

You can open a new page using window.open and then check periodically to see if the window has been closed. The reference to the opened window is returned by window.open and you can check if it has been closed using windowHandle.closed.

btn.onclick = function() {
    var win = window.open(
        "http://www.stackoverflow.com", 
        "Secure Payment");
    var timer = setInterval(function() {
        if (win.closed) {
            clearInterval(timer);
            alert("'Secure Payment' window closed !");
        }
    }, 500);
}

See, also, this short demo.

For more info on window.open and best practises, take a look at MDN.