IFRAME POSTMESSAGE CODE
IFRAME POSTMESSAGE WINDOWS

PS: I know it is probably best to avoid iFrames, however for the purpose of my application, this is necessary to use. There is also a postMessage() that can be used when the browser context is the same. The data being sent is serialized using the structured clone algorithm and will accept almost any type of simple or complex data.

IFRAME POSTMESSAGE WINDOWS

I must accomplish it in this way using postMessage(). window.postMessage() is a safe way to send messages between windows in different domains or origins. I am having a lot of trouble accomplishing this. ICoreWebView2Frame2::ExecuteScript always works even if the prior call to ICoreWebView2Frame2::PostWebMessageAsJson fails to receive the message. Then, I want to show an iFrame of the localhost:8000/(someid) in the localhost:3000 page. Then I tried to use ICoreWebView2Frame2::ExecuteScript right after ICoreWebView2Frame2::PostWebMessageAsJson just to figure out whether a test script can be executed in the iframe. Sometimes it works, but most of the time not. But the iframe does not always receives the reply from the host app, but the the host app sends the message back.

The host app always receives the message from the iframe.

IFRAME POSTMESSAGE CODE

This is really weird and currently I do not see a reason for this and I also can not debug this because I do not have access to the internal code to see what happens here. Window.postMessage is a browser method that provides this capability for Google Chrome, Mozilla Firefox, and Apple Safari. This works sometimes and after a few seconds and retries I get the response. There are times when you want to enable communication for an IFRAME that contains content on a different domain. I've tested a bit around and I tried to send the command in an interval until I receive a response. I say often because sometimes it works and sometimes it does not work. This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. But if we change the source of the iframe to load a new version for a new command, then receiving the responses often does not work. The window.postMessage () method safely enables cross-origin communication between Window objects e.g., between a page and a pop-up that it spawned, or between a page and an iframe embedded within it. The host app processes the commands and sends the result back to the iframe via ICoreWebView2Frame2::PostWebMessageAsJson. The iframe sends commands to the host app via. We use ICoreWebView2Frame2::add_WebMessageReceived to receive messages from an iframe. We have a problem with PostWebMessageAsJson to an Iframe.

Iframe postmessage