[oslc-core] Problem in Delegated UI Window Name protocol example

[Dave]

On Thu, Feb 17, 2011 at 12:05 PM, Steve K Speicher <sspeiche at us.ibm.com> wrote:
> I believe there was some goal to keep the samples "clean" by just using
> standard HTML/JS/DOM and not put browser-specific checks in (hard to draw
> the line where to stop with this).

Yes, that is a valid concern. I think we can make some minor changes
and improve things a bit.


> I'm fine either way though, as the reality is people will snag these and
> want to use them.  Perhaps it would be good to attach a more complete
> example to the spec (provide a reference to) or handle this with other
> supporting material, which we tried to do with IBM Developer Works
> articles, etc.

I have expanded the existing example to work on IE and have tested
successfully on Chrome, Firefox and Safari. I had to work around two
IE related issues:

   The "use attachEvent on IE" issue
   http://bugs.dojotoolkit.org/ticket/9609

   The "can't set iframe name via JavaScript on IE" issue
   http://stackoverflow.com/questions/2138564/dynamic-iframe-ie-name-issue


Here's the new example code:

    var pickerURL = ... // URL of Provider's Delegated UI Dialog
    var returnURL = ... // Consumer's Return URL

    var frame = document.createElement('iframe');

	function windowNameProtocol() {
		
		// Step #1: create iframe with fragment to indicate protocol
		// Step #2: set the iframe's window.name to indicate the Return URL
		if (ie > 0) {
			frame = document.createElement('<iframe name=\'' + returnURL + '\'>');
		} else {
			frame = document.createElement('iframe');			
			frame.name = returnURL;
		}
		frame.src = pickerURL + '#oslc-core-windowName-1.0';
		frame.width = 450;
		frame.height = 300;

		displayFrame(frame);

		// Step #3: listen for onload events on the iframe
		var ie = window.navigator.userAgent.indexOf("MSIE");
		if (ie > 0) {
			frame.attachEvent("onLoad", onFrameLoaded);
		} else {
			frame.onload = onFrameLoaded;
		}
	}

	function onFrameLoaded() {
		try { // May throw an exception if the frame's location is still a
different origin
		
			// Step #4: when frame's location is equal to the Return URL
			// then read response and return.
			if (frame.contentWindow.location == returnURL) {
				var message = frame.contentWindow.name;
				destroyFrame(frame);
				handleMessage(message);
			}
		
		} catch (e) {
			// ignore: access exception when trying to access window name
		}
	}

I plan to replace the existing example with the above this week.

As usual, feedback is most appreciated.

Thanks
- Dave