Practical JavaScript, DOM Scripting and Ajax Projects by Frank Zammetti

By Frank Zammetti

This "learn through instance" publication bargains 10 whole JavaScript initiatives that would retailer net builders numerous hours of improvement time. those tasks can function samples to profit from and/or be tailored to be used in different initiatives. the ten tasks all deal with universal wishes in sleek net functions, together with a application library, a validation framework, a GUI widget framework, a dynamic occasion calendar program, a drag and drop buying cart, and extra! assurance info JavaScript most sensible practices, Ajax ideas, and a few of the most well-liked JavaScript libraries, resembling Prototype, Script.aculo.us, and the Yahoo YUI library.

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Just as one example, let’s consider handling keypresses in IE vs. Firefox. Let’s say we want to hook the keyDown event for the current document. KEYDOWN); The basic keyDown() function signature for either browser is this: function keyDown(e) { } In Firefox, the parameter e will be an event object passed in that describes the keypress event. In IE, however, this parameter is not passed in at all because IE uses an event model called event bubbling. To get a reference to the event object in IE, you need to reference the event property of the window object.

Or that Frank isn’t the name of my father (which it just happens to be)? Clearly, the call syntax for Person2 is better in terms of code clarity. The code is also a bit more easily extensible with that approach. This is a relatively minor point, but it is an element of style that has only in the past few years come into the minds of JavaScript developers. Early on, you would rarely have seen the approach used in Person2. You would have instead seen function calls with oodles of arguments. But if you asked C++ developers how they would have coded this, you almost certainly would hear an answer involving some sort of collection, maybe a value object being passed in, or something along those lines.

To get a reference to the event object in IE, you need to reference the event property of the window object. This isn’t a difference in JavaScript itself; this is a difference in the event-handling model in the DOM of each browser. To take the example further, once you have a reference to the event object, you will quite likely want to figure out which key was actually pressed. Again, there are DOM differences to overcome. In IE, the event object exposes a keyCode property. In Firefox, the corresponding property is called charCode.

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