7.3 Sending messages from the HTML to the UDI
Your HTML can send messages to your UDI using window.parent.postMessage(). For example:
window.parent.postMessage("Message to UDI", "*");
This is received by the UDI in a UDI.onHTMLMessage() function. For example:
UDI.onHTMLMessage = function(msg) {
// msg == "Message to UDI"
};
Common uses include notifying the UDI of an action such as button click, or a change of value in some input field in the HTML.
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