How to control opener page which is opened by window.open method

Question

I have a page in which i m calling another popup by window.open method. The only thing how can i change a label in opener page from popup page while the popup page is still alive ie which is not closed yet

Answer 1

It should be like this:

window.opener.document.getElementById('label1').value = "the new value";

Answer 2

It's better to let the opener window take care of changing values by exposing a small API to the popup window.

I've outlined it here: javascript - pass selected value from popup window to parent window input box

Answer 3

<script>
function myFunction() {
    var additionalWindow = window.open("/additional");

    // Write on the additional window
    additionalWindow.document.write('written from separate window');

    // Call a function on the additional window
    additionalWindow.someFunction();
}
</script>

Here's Mozilla's documentation on window.open().