Google Apps Script - redirecting by «window.top.location.href» stop working

Question

This construction doesn't work in my GAS project anymore to redirect browser:

return HtmlService.createHtmlOutput(`<script>window.top.location.href='${url}';</script>`);

This construction works:

return HtmlService.createHtmlOutput(`<script>window.location.href='${url}'</script>`);

But it hides real redirected page URL behind the script URL because we are changing not the ".top" window href.

Has anyone faced this problem too?

P.S.: I tested it on several people with Chrome browser - the same result.

Answer 1

I have been having the same issue... Noticed it a few weeks ago and just did a search and found this question on Stack Overflow. However, upon a further search it appears as though Google has disabled the ability to do this as per their September update:

https://developers.google.com/apps-script/releases

September 2021 September 1, 2021 In the HTML Service iframe sandbox, allow-top-navigation, which allows the content >to navigate its top-level browsing context, is restricted and not set as an >attribute in the sandbox. Instead, the allow-top-navigation-by-user-activation >attribute has been added to the sandbox.

If you need to redirect your script, add a link or a button for the user to take >action on.

Learn more about HMTL Service restrictions.

However, it appears to me like it still works in some circumstances. I have a application with about 30 pages or so and it appears on some pages it still works. Have not been able to find out the reason though.