So far I've only seen tutorials for postmessage where one window sends a single kind of message, and the other window interprets the message in only a single way.

Earth was suddenly teleported away from the sun. Well strictly speaking you can never pass functions with JSON, at least not in any direct way.

You can always perform JSON encode and decode on either side of the message. All frames communicating use the same JS library for this. The. Extra message information is an application- or driver-defined value associated with the current thread's message queue.

To get extended error information, call GetLastError. One pretty easy way to trigger callbacks without passing any actual code would be: I recently faced the same problem. It calls the window procedure for the specified window and returns immediately.

The object will be serialized, so there are some concerns on that front, but: A little nicer, eh? If the target window belongs to a different thread from the caller, then the callback function is called only when the thread that called SendMessageCallback also calls GetMessage, PeekMessage, or WaitMessage. Retrieves the extra message information for the current thread. That doesn't really solve the problem. The string would look like this: Within the postMessage handler, the passed data can be split (docs) on the | character, then each segment of the message can be used as needed. In practice, there "is not" support for objects as data, behind the scenes the browser is turning your passed object into a string (serialization).

Essentially what you are doing is marshalling the function so that it can be sent to the iframe and then unmarshalling it on the other end. Further, there is a known bug in IE 8/9 which breaks postMessage for anything other than frames. Access-Control-Allow-Origin Multiple Origin Domains?

postMessage (JSON. A handle to the window whose window procedure will receive the message. Posts a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message. This section describes messages and message queues and how to use them in your applications. Is every finite group the outer automorphism group of a finite group?

Used to define private messages for use by private window classes.

Check out this example: < revealWindow >. Stack Overflow for Teams is a private, secure spot for you and Making statements based on opinion; back them up with references or personal experience. An application-defined callback function used with the, Sends the specified message to a window or windows. Posts a message to the message queue of the specified thread.

Here's a very basic demonstration of that: I take this concept a bit further and use a message handler lookup where the message has the desired handler function name to evoke and pass a message to.

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