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Unlike the standard request/response approach found in a standard Web client, an Ajax application does things a little bit differently. 1. A client-side event triggers an Ajax event. Any number of things can trigger this, from a simple onchange event to some specific user action. You might have code like this: <input type="text"d="email" name="email" onblur="validateEmail()";> 2. An instance of the XMLHttpRequest object is created. Using the open() method, the call is set up the URL is set along with the desired HTTP method, typically GET or POST. The request is actually triggered via a call to the send() method. This code might look something like this: var xmlHttp; function validateEmail() { var email = document.getElementById("email"); var url = "validate email=" + escape(email.value); if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } xmlHttp.open("GET", url); xmlHttp.onreadystatechange = callback; xmlHttp.send(null); } 3. A request is made to the server. This might be a call to a servlet, a CGI script, or any server-side technique. 4. The server can do anything you can think of, including accessing a data store or even another system. 5. The request is returned to the browser. The Content-Type is set to text/xml the XMLHttpRequest object can process results only of the text/html type. In more complex instances, the response might be quite involved and include JavaScript, DOM manipulation, or other related technologies. Note that you also need to set the headers so that the browser will not cache the results locally. You do this with the following code: response.setHeader("Cache-Control", "no-cache"); response.setHeader("Pragma", "no-cache");1





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Figure 7-1. The x value increases from left to right; the y value increases from the top downward. Figure 7-2 shows how the coordinate system of a widget can be different from the screen when drawing on a widget. The coordinates used when drawing on a widget are aligned so that (0,0) is the upper-left corner of the widget (which is not always the same as (0,0) in the device s global coordinate system). The global coordinate system addresses actual pixels onscreen, dots on printers, and points on other devices.

his chapter delineates the syntax and application of interaction algebra for both function set networks and databases.

Figure 7-2. When drawing on a widget, the upper-left corner of the widget is (0,0).

1. Pragma and Cache-Control don t they do the same thing Yes, they do, but Pragma is defined for backward compatibility.





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A point on the screen is represented by a QPoint object, and you can specify the x and y values for a point in the constructor. A point is usually not enough to draw something; to specify a point alongside a width and a height you can use the QRect class. The QRect constructor accepts an x value, a y value, and a width, followed by a height. Figure 7-3 shows a QRect and QPoint in a coordinate system.

The most extensive usage of interaction algebra is for function set interactions. Designers who are already very familiar with each of the common function set interaction mechanism types (design patterns) will be able to very quickly get the feel of interaction algebra.

There are two classes closely related to QPoint and QRect: QPointF and QRectF. They are equivaTip

lent, but operate on floating-point values. Almost all methods that accept a rectangle or point can accept either type of rectangle or point.

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6. In this example, you configure the XMLHttpRequest object to call the function callback() when the processing returns. This function checks the readyState property on the XMLHttpRequest object and then looks at the status code returned from the server. Provided everything is as expected, the callback() function does something interesting on the client. A typical callback method looks something like this: function callback() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { //do something interesting here } } } As you can see, this is different from the normal request/response paradigm but not in a way that is foreign to Web developers. Obviously, you have a bit more going on when you create and set up an XMLHttpRequest object and when the callback has some checks for states and statuses. Typically, you will wrap these standard calls into a library that you will use throughout your application, or you will use one that is available on the Web. This field is new, but a considerable amount of activity is happening in the open-source community. In general, the various frameworks and toolkits available on the Web take care of the basic wiring and the browser abstractions, and some add user interface components. Some are purely client based; others require work on the server. Many of these frameworks have just begun development or are in the early phases of release; the landscape is constantly changing, with new libraries and versions coming out regularly. As the field matures, the best ones will become apparent. Some of the more mature libraries include libXmlRequest, RSLite, sarissa, JavaScript Object Notation (JSON), JSRS, Direct Web Remoting (DWR), and Ruby on Rails. This is a dynamic space, so keep your RSS aggregator tuned to those sites dedicated to posting about all things Ajax!

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