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It looks straightforward enough, but it doesn t do what we want it to. The alert box will generally return a message undefined, not the value property that we passed to the constructor. Let s see why. The function clickHandler gets invoked by the browser when the DOM element is clicked, and it sets the function context to the DOM element, not the Button JavaScript object. So, this.value refers to the value property of the DOM element, not the Button object. You d never tell by looking at the declaration of the event-handler function, would you We can fix things up by passing a reference to the Button object to the DOM element, that is, by modifying our constructor like this:

NOTE: Apple has used two different methods to generate the unique machine identifier for ByHost preference names. The older style used the machine s Media Access Control (MAC) address. This was silently switched to use the machine s Universally Unique Identifier (UUID) to support the new MacBook Air which didn't have a built-in Ethernet port. Changing the AirPort card on these machines would also change the en0 MAC address, even if the motherboard was untouched. The current machine UUID is stored in the I/O Registry and can be retrieved using System Profiler, or the ioreg command: ioreg -rd1 -c IOPlatformExpertDevice | grep IOPlatformUUID This perhaps should make the point clear: the best method of managing these preferences is with Managed Preferences!

Remove-OwaVirtualDirectory "owa (Default Web Site)"

function Button(value,domEl){ this.domEl=domEl; this.value=value; this.domEl.buttonObj=this; this.domEl.onclick=this.clickHandler; }

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The preceding command uses the owa virtual directory, but it could have used Exchange, Public, Exchweb or Exadmin as well. To re-create the directory, use the following command (again replacing owa in the quoted portion of the command with the specified virtual directory you are re-creating:

The DOM element still doesn t have a value property, but it has a reference to the Button object, which it can use to get the value. We finish up by altering the event handler like this:

Button.prototype.clickHandler=function(){ var buttonObj=this.buttonObj; var value=(buttonObj && buttonObj.value) buttonObj.value : "unknown value"; alert(value); }

New-OwaVirtualDirectory -OwaVersion "Exchange2007 -Name "owa (Default Web Site)"

The DOM node refers to the Button, which refers to its value property, and our event handler does what we want it to. We could have attached the value directly to the DOM node, but attaching a reference to the entire backing object allows this pattern to work easily with arbitrarily complex objects. In passing, it s worth noting that we ve implemented a mini-MVC pattern here, with the DOM element View fronting a backing object Model. That s the classic event model, then. The main shortcoming of this event model is that it allows only one event-handler function per element. In the Observer pattern that we presented in chapter 3, we noted that an observable element could have any number of observers attached to it at a given time. When writing a simple script for a web page, this is unlikely to be a serious shortcoming, but as we move toward the more complex Ajax clients, we start to feel the constraint more. We will take a closer look at this in section 4.3.3, but first, let s look at the more recent event model.

Because a virtual directory is just that, virtual, you will not encounter any problems from deleting it, except that while it is offline your clients who use it will not be able to connect to the server. Note that when you re-create the virtual directory, you will need to go into IIS and customize the permissions as defined by your organization s security policy before using the virtual directory again. The ability to delete virtual directories or, more importantly, to create new ones is a great help when troubleshooting connectivity issues. After you ve created a new virtual directory, before you customize permissions, test Entourage. Then, after you customize the permissions, test Entourage again. Or, you may want to create an entirely new virtual directory without deleting the existing one during testing. Because Exchange, Public, Exchweb and Exadmin are not native to Exchange 2007, you would actually replace Exchange2007 with Exchange2003or2000 for those directories. So if you wanted to re-create Exadmin, for example, you would use the following command

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