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Most of the document management software listed earlier can handle viewing PowerPoint files. Chances are slim that you ll need to actually present from your Android phone, but, if you need to, you can use Docs to Go or the slideshow feature in your phone gallery in a pinch. At this time, most Android phones do not support TV out, so you can t just plug it into a TV or monitor and see video images. This is a hardware not software limitation, so most of us actually giving presentations using Android phones are stuck projecting them from an Elmo. However, the Droid Incredible and HTC EVO do come with TV out capabilities, which means future phones may do the same. That also means you can pair them with portable projectors that take standard TV connections, use MightyMeeting (Figure 15 5), and leave the PC behind.

E B V N nous function calls were made. New to the function GetIt is the additional parameter xmlhttp.

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This was added so that multiple XMLHttpRequest instances could be used with GetIt. The variables xmlhttp1 and xmlhttp2 represent two different instances of XMLHttpRequest, and assigned to each instance is the data member myState. To make two separate HTTP requests, GetIt is called twice with different XMLHttpRequest instances and different URLs. When the asynchronous XMLHttpRequest returns, the function AsyncUpdateEvent is called. The function AsyncUpdateEvent is assigned to the instance of either xmlhttp1 or xmlhttp2, and therefore in the implementation of the function, the this keyword should work. What happens is that the this.myState reference in the function is undefined, and therefore AsyncUpdateEvent has no idea to which XMLHttpRequest instance it is assigned. A solution would be to create two callback functions, AsyncUpdateEvent and AsyncUpdateEvent2, and assign them individually to the instances xmlhttp1 and xmlhttp2. The function GetIt would be updated to include an additional parameter that represents the callback where the request results are processed. Creating two callback functions would work but is not elegant because for three independent requests you would need three callbacks. The real context of this problem is that JavaScript in this instance has lost its object-oriented features. What needs to be solved is the association of an XMLHttpRequest instance with a callback, and that is solved in the next section.

There are really two steps to adding new users. First, you must add the user to Active Directory, which can be accomplished through the Active Directory Users And Computers application. Figure 10-4 shows the New Object - User dialog box in Active Directory.

Don t have a phone with TV out There are still plenty of other ways Android can help your presentation. Table 15 5 shows some of your options.

Let s focus on how the Asynchronous class solves the instance and callback problem. The specific code is illustrated again as follows: function Asynchronous_call(url) { var instance = this; this._xmlhttp.open('GET', url, true); this._xmlhttp.onreadystatechange = function() { switch(instance._xmlhttp.readyState) { case 1: instance.loading(); break; case 2: instance.loaded(); break; case 3: instance.interactive(); break; case 4: instance.complete(instance._xmlhttp.status, instance._xmlhttp.statusText, instance._xmlhttp.responseText, instance._xmlhttp.responseXML); break; EBVN } } this._xmlhttp.send(null); } Asynchronous_call is associated with an instance of Asynchronous because of the prototype definition. Then when the HTML code calls asynchronous.call, the function Asynchronous_call is called and the this instance references the instantiated class. The variable this.xmlhttp is an instance of XMLHttpRequest, and the property onreadystatechange needs to be assigned a function. There is a peculiarity with JavaScript in that if a property is assigned the value of this.somefunction, then what is assigned is a function and not a function associated with a class instance, as was shown by the code that looked like it would work, but didn t. When the method Asynchronous_call is called, the this variable references an instance of Asynchronous. What is happening is that JavaScript is associating a function with an instance. Logically then, if the property onreadystatechange were assigning a function associated with an instance of Asynchronous, then when a callback is made, the this variable should reference an instance of Asynchronous. Figure 2-7 shows that there is no reference to an instance of Asynchronous.

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