Window.opener in Microsoft Edge undefined when running at localhost

Question

I'm using Microsoft Edge in localhost for development.

Website is accessed via http://localhost

I open a popup and want it to post a message to the opener via window.opener.postMessage

My code works with Chrome, and Safari, and even Microsoft Edge when the website is on staging or production.

But when I run in in local mode, the window.opener is undefined.

When you say local mode I assume you mean file:/// instead of http://localhost - possible duplicate of JavaScript window.opener call parent function — Adam Jenkins
– Adam Jenkins, Commented Jul 2, 2015 at 23:37
No as I said, I'm running it through localhost, with the http:// — kube
– kube, Commented Jul 2, 2015 at 23:42
Then this is probably applicable: It is also not supported in IE if the opener is in a different security zone. from developer.mozilla.org/en-US/docs/Web/API/Window/opener — Adam Jenkins
– Adam Jenkins, Commented Jul 2, 2015 at 23:43
As I said, the code works well when ran in production, even ran with Edge, and the targetOrigin the message listener is set to '*' to be usable with a desktop app built with Electron. Both popup and main window are in http://localhost:9000 — kube
– kube, Commented Jul 2, 2015 at 23:49

securecodeninja · Accepted Answer · 2015-07-04 01:44:22Z

2

CORS on localhost is tricky so try to create a domain name you like to your hosts file (%windir%\System32\Drivers\etc\hosts) - if you're in a Windows-based platform and map those back to 127.0.0.1.

You probably already know how to change the hosts file but just in case:

http://support.hostgator.com/articles/general-help/technical/how-do-i-change-my-hosts-file

answered Jul 4, 2015 at 1:44

securecodeninja

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Ryan Joy · Accepted Answer · 2015-07-04 15:48:33Z

0

Microsoft Edge runs in network isolation and does not currently support localhost testing. Run this in an elevated command prompt to enable loopback support:

CheckNetIsolation LoopbackExempt -a -n=Microsoft.MicrosoftEdge_8wekyb3d8bbwe

In a future update, you’ll be able to enable localhost loopback support using about:flags.

More info: http://dev.modern.ie/platform/faq/how-can-i-debug-localhost/

answered Jul 4, 2015 at 15:48

Ryan Joy

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1 Comment

kube Over a year ago

I already configured this, as I said I can open popups so it means my code runs in localhost.

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