Sometimes, you display information in an iframe and you need to communicate it back to your Windows 8 app. You may think like I did “just navigate to a specific page with the arguments in the URL and make the Win8 app read the location of the iframe”…. Cool but all you’ll get is an “access denied”.<\/p>\n

To have this kind of scenario, you have to do some more code on the server page …<\/p>\n

\n
\nThe solution is maybe well known by the web developpers : use the postMessage function<\/a>.<\/strong><\/p>\n

In the page displayed by the Windows8 App in an iframe, just call the postMessage<\/strong> on the window to send a message to the app. Don’t forget to set the origin to “*”:
\n[javascript]window.parent.postMessage("this is a messsage very important","*");[\/javascript]<\/p>\n

In the windows 8 app, you can register to this kind of message with a very classic code. Also,you can check the origin field to be sure that the message comes from your web site<\/strong>.
\n[javascript]
\nwindow.addEventListener("message", messageReceived, false);<\/p>\n

function receiveMessage(e) {
\n if (e.origin === "http:\/\/jonathanantoine.com") {<\/p>\n

}
\n};[\/javascript]<\/p>\n","protected":false},"excerpt":{"rendered":"

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