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CHAPTER 5 I BUILDING THE ULTIMATE AJAX DEVELOPER S TOOLBOX
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function describe(vehicle) { var description = ""; description = description + "Number of wheels (via property): " + vehicle.wheelCount; description = description + "\n\nNumber of wheels (via accessor): " + vehicle.getWheelCount(); description = description + "\n\nCurb Weight (via property): " + vehicle.curbWeightInPounds; description = description + "\n\nCurb Weight (via accessor): " + vehicle.getCurbWeightInPounds(); description = description + "\n\nRefueling Method: " + vehicle.refuel(); description = description + "\n\nMain Tasks: " + vehicle.mainTasks(); alert(description); } function createVehicle() { var vehicle = new Vehicle(); describe(vehicle); } function createSportsCar() { var sportsCar = new SportsCar(); createInheritance(new Vehicle(), sportsCar); sportsCar.setCurbWeightInPounds(3000); describe(sportsCar); } function createCementTruck() { var cementTruck = new CementTruck(); createInheritance(new Vehicle(), cementTruck); cementTruck.setWheelCount(10); cementTruck.setCurbWeightInPounds(10000); describe(cementTruck); } </script> </head> <body> <h1>Examples of Classical Inheritance in JavaScript</h1> <br/><br/> <button onclick="createVehicle();">Create an instance of Vehicle</button> <br/><br/> <button onclick="createSportsCar();">Create an instance of SportsCar</button> <br/><br/> <button onclick="createCementTruck();">Create an instance of CementTruck</button> </body> </html>
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Clicking each of the buttons on the page produces the results shown in Figure 5-17. Note that as expected, attempting to access the private properties directly simply returns undefined.
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Figure 5-17. The results of creating the Vehicle, SportsCar, and CementTruck objects and describing them using the describe function. The private properties cannot be accessed directly, as shown by the undefined values in the alert boxes.
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In this chapter, we introduced a number of tools and techniques that can make your development process a much more enjoyable experience. JSDoc helps you document your JavaScript code so it can be more easily understood and used by other developers. You ll surely write some of your own reusable JavaScript libraries if you start using Ajax techniques frequently, and you ll want to document the code with JSDoc to make it easy for others to use those libraries. Tools such as HTML Validator and Checky help you ensure that the HTML code you write is valid HTML. Invalid HTML can cause undesirable behavior, so using valid HTML or XHTML eliminates one potential cause of errors. Valid XHTML or HTML is also more likely to be rendered identically across multiple browser platforms. The DOM Inspector tool ships with Firefox and other Mozilla browsers and lets you inspect the nodes of an HTML document as a structured tree. DOM Inspector allows you to view each node, inspect its attribute values, and even change them on the fly. You can move nodes dynamically from one spot in the page to another, without rewriting the HTML. DOM Inspector is useful for inspecting nodes that have been dynamically created via JavaScript. JSLint is a JavaScript verifier tool. While it can t determine that the logic of JavaScript is correct, it can help identify errors in the language syntax or areas that could be prone to error because of poor coding styles. Removing comment lines and carriage return characters in JavaScript can greatly reduce the size of the JavaScript file and the time it takes to download to the client browser. MemTronic s HTML/JavaScript Cruncher-Compressor not only removes comment lines and carriage returns
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but actually compresses the JavaScript code to make it download even faster. A nice side effect of the compression is that it makes the JavaScript rather difficult to read, which helps secure the inner workings of your JavaScript code from prying eyes. The Web Developer extension for Firefox provides a number of useful tools and utilities for the active Web developer. The tools allow you to resize images, dynamically edit CSS style rules, and change form methods from GET to POST (and vice versa), just to name a few. Finally, you saw some advanced JavaScript techniques such as object-oriented programming. First you saw how JavaScript uses a prototype-based scheme to mimic inheritance. Then you saw how JavaScript supports the concept of information hiding using private properties that are accessible only via publicly available methods. Finally, you saw a technique by which JavaScript can mimic classically based inheritance schemes, like those used by C++ and Java. This technique will likely prove to be a more natural coding style for those accustomed to fully object-oriented languages. These tools and techniques can make your life as an Ajax developer much easier and more enjoyable. Try them all so you can pick the ones you like; also, you may come across others on the Web that you ll find useful.
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