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get id of current tab, beforeActivate

I found code to provide enable canceling of switching tabs, but I need to run code specific to the ID of the currently selected tab.  How do I get the currently selected tab, not the tab clicked on?  I tried the beforeActivate  ui.oldTab but that returned "undefined".


$("#myTabs").tabs({ 
    beforeActivate: function(event,ui){
    alert('current: ' + $(ui.oldTab).attr('id'));
    return CheckSomething();

    }
});

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Here is what I found so far:
cancel tab switch:  http://jsfiddle.net/nuywj/
get id of tab being selected:  http://jsfiddle.net/WnDV9/2/
beforeActivate:  http://api.jqueryui.com/tabs/#event-beforeActivate
ASKER CERTIFIED SOLUTION
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Gary
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ASKER

That worked.  But why doesn't oldTab work? What is it's purpose?

Here is the 'final' version:
var currTab="#tabs-1";

var $tabs = $("#tabs").tabs({
    beforeActivate: function( evt, ui ) {
        var canContinue=true;
        if (1!=2){  //validation tests here
            alert('missing stuff for ' + currTab);
            canContinue == False; 
        }
            return canContinue
    },
    select: function( evt, ui ) {
        currTab=$(ui.tab).attr('href')
    }
})

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I noticed that I was using http://code.jquery.com/ui/1.10.3/jquery-ui.js", where your jsFiddle is using  1.9.2.  Your code wasn't working on my page until I changed mine to 1.9.2.  

But with either version, oldTab is undefined.
Don't know, didn't bother with it because you wanted to perform an action before the tab change happens which means oldTab would be of no use anyway since it would be the previous tab after the change had already happened - if you understand me...
But according to the documention (http://api.jqueryui.com/tabs/#event-beforeActivate), it says oldTab is the tab that is about to be deactivated, while newTab is the tab about to be activated.

Don't get me wrong, I appreciate your quick and accurate response, but being new to jQuery I am trying to understand as much as I can :)
I'll be damned if I can get it work - it's always undefined.
I have tried googling jquery tab oldTab undefined, but not getting anything good.
I've got another open question regarding tabs if you have time:
https://www.experts-exchange.com/questions/28126558/create-tabs-dynamically-issues-with-href.html