Open and control new window in KRL/Kynetx - krl

Question

I want to open a new window by clicking on a button (which is injected via Kynetx), but I want this new window to run in the Kynetx sandbox enviornment. This is because the new window will have a button which talks to a REST API, and I want to avoid browser same origin policy. I will also want to modify the DOM of this new window.
//code in Kynetx extension
ruleset a2031x3 {
meta {
name "Open a new window (SO 12030281)"
description << >>
author "Steve Nay"
logging off
}
dispatch {
domain "exampley.com"
}
global { }
rule first_rule {
select when pageview ".*" setting ()
emit <|
// Open a new window and write some content
var newContent = 'some content';
newWin = window.open();
newWin.document.write(newContent);
|>;
}
}
Please help.

Answer 1

You need to wrap that JavaScript code in an emit block, like this:
ruleset a000x0 {
meta {
name "Open a new window (SO 12030281)"
description << >>
author "Steve Nay"
logging off
}
dispatch { }
global { }
rule first_rule {
select when pageview ".*" setting ()
emit <|
// Open a new window and write some content
var newContent = 'some content';
newWin = window.open();
newWin.document.write(newContent);
|>;
}
}
That will open a popup window like you want, and the write() call succeeds: