By Paul Wilton

ISBN-10: 0764555871

ISBN-13: 9780764555879

ISBN-10: 0764573772

ISBN-13: 9780764573774

What's this booklet approximately? JavaScript is the popular programming language for web content functions, letting you improve your websites with interactive, dynamic, and customized pages. This absolutely up to date advisor exhibits you the way to exploit JavaScript’s client-side scripting thoughts for the most recent models of Netscape and web Explorer, whether you’ve by no means programmed prior to. you start with uncomplicated syntax and find out about facts varieties and the way to constitution code for decision-making. you then discover ways to use dates, strings, and different easy items of JavaScript. subsequent, you spot how one can use JavaScript to control items supplied by way of the browser, comparable to varieties and home windows. From there, you progress into complicated subject matters like utilizing cookies and dynamic HTML. upon getting an effective beginning, you discover dynamic new release of web pages utilizing server-side scripting and back-end databases. and also you perform what you study via construction a pattern program as you cross. What does this booklet conceal? listed here are many of the issues you can find during this ebook: What varieties of info are utilized in JavaScript easy methods to establish and proper flaws on your code ideas for programming the browser tips on how to use Microsoft Script Debugger and Netscape Script Debugger how one can deal with cross-browser matters How JavaScript interacts with XML and HTML who's this booklet for? This ebook is for an individual who desires to research JavaScript programming. you will have a few realizing of HTML and the way to create static websites, yet no past programming adventure is critical.

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Extra resources for Beginning JavaScript Second Edition

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30 Chapter 2: Data Types and Variables Chapter 2: Data Types and Variables 31 Figure 2-3 In the dialog box that appears, select the Advanced tab. Under Browsing, make sure the checkbox next to Disable script debugging is not checked and that the Display a notification about every script error box is checked, as shown in Figure 2-4. Note that IE 4 doesn't have a Display notification about every script error checkbox, so you just need to uncheck the Disable script debugging checkbox. Once you've done this you can click OK to close the dialog box.

We'll be looking at more string manipulation techniques in Chapter 4—we'll see how to search strings and insert characters in the middle of them, and in Chapter 8 we'll be seeing some very sophisticated string techniques. Data Type Conversion As we saw, if you add a string and a number together, JavaScript makes the sensible choice and converts the number to a string, then concatenates the two. Usually JavaScript has enough sense to make data type conversions like this whenever it needs to, but there are some situations where we need to convert the type of a piece of data ourselves.

The main reason for the name comes from the way that the function works. It actually goes through (that is, parses) each character of the string you ask it to convert and sees if it's a valid number. If it is valid, parseInt() uses it to build up the number; if it is not valid, the command simply stops converting and returns the number it has converted so far. For example, if your code is parseInt("123"), JavaScript will convert the string "123" to the number 123. For the code parseInt("123abc"), JavaScript will also return the number 123.

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Beginning JavaScript Second Edition by Paul Wilton


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