Allthough your src = encodeURI should work, I would have gone a different way:
var iframe = document.createElement('iframe');
var html = '<body>Foo</body>';
document.body.appendChild(iframe);
iframe.contentWindow.document.open();
iframe.contentWindow.document.write(html);
iframe.contentWindow.document.close();
As this has no x-domain restraints and is completely done via the iframe handle, you may access and manipulate the contents of the frame later on. All you need to make sure of is, that the contents have been rendered, which will (depending on browser type) start during/after the .write command is issued - but not nescessarily done when close() is called.
A 100% compatible way of doing a callback could be this approach:
<html><body onload="parent.myCallbackFunc(this.window)"></body></html>
Iframes has the onload event, however. Here is an approach to access the inner html as DOM (js):
iframe.onload = function() {
var div=iframe.contentWindow.document.getElementById('mydiv');
};
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