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From "Pier Bover (JIRA)" <>
Subject [jira] [Created] (CB-11885) iframe message error
Date Thu, 22 Sep 2016 02:19:20 GMT
Pier Bover created CB-11885:

             Summary: iframe message error
                 Key: CB-11885
             Project: Apache Cordova
          Issue Type: Bug
          Components: Plugin WKWebViewEngine
    Affects Versions: 4.2.1
         Environment: iOS 9
            Reporter: Pier Bover
            Assignee: Shazron Abdullah

When trying to communicate between an iframe and the main window using Window.postMessage()
I get the error:

`Blocked a frame with origin "null" from accessing a frame with origin "null".`

This only happens from the iframe to the main window, when communicating the other way around
it works fine.

Both files are run locally. The error only happens after adding the plugin `cordova-plugin-wkwebview-engine`.
When using UIWebView the error does not happen.

The weird thing is that this error is shown exactly 11 times, but the message goes through
anyway. See this screenshot taken from Safari while using the simulator:
You can the Messageevent happening at the end.

I have added `sandbox="allow-same-origin allow-scripts allow-popups allow-forms"` to the iframe
tag and it fix it.

This is the code that listens to the message:
`window.addEventListener("message", eventHandler, false);`

And this is the code that emits the message from the iframe:

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