How to intercept tab disclosure in javascript

Question

Hello ADFrs,
I am trying to write some ADF  and javascript code that intercepts a tab disclosure event, and pops up a message that says when the tab is dirty, as the user do they wanna save first.
I found this really good document online from Frank N. 
http://www.oracle.com/technetwork/developer-tools/adf/learnmore/104-interceptpaneltabswitching-1880961.pdf
I've implemented this the way that he has listed.  However, I'm getting a weird behavior.  When I click on another tab, I get the popup and my javascript is getting called, but the tab I'm switching to is still getting disclosed.  Based on the document, the tab shouldn't get disclosed after I cancel the discloseEvent in my javascript.
I currently have something like this..
<panelTabbed>
    <showDetailItem ...   >
<clientListener type="disclose" method="handleTabSwitch"/>
    </showDetailItem>
    <showDetailItem ..... >
<clientListener type="disclose" method="handleTabSwitch"/>
</showDetailItem>
</panelTabbed>
in my JS
function handleTabSwitch(disclosedEvent) {
     console.log("firing off handleTabSwitch() ...");
     var tab = disclosedEvent.getSource();
     if(tab.isDisclosed == false) {
         disclosedEvent.cancel();
After adding this code, when I select a new tab, my javascript gets fired, but the new tab is still opening.  I want to set this up so that the other tab never opens. 
Anyone ideas?

Answer 1

... are you sure the provided sample doesn't work? I downloaded the sample and ran it with JDeveloper 11.1.2.3. Testing it on FF 12 and IE 8 worked like a charm. Note that there are two disclosure events in JavaSCript and you want to make sure you listen for the first
Frank