Download Beginning JavaScript Second Edition by Paul Wilton PDF

By Paul Wilton

What's this ebook approximately? JavaScript is the popular programming language for online page purposes, letting you improve your websites with interactive, dynamic, and customized pages. This absolutely up to date consultant indicates you ways to use JavaScript’s client-side scripting suggestions for the latest models of Netscape and net Explorer, whether you’ve by no means programmed prior to. you start with simple syntax and find out about facts forms and the way to constitution code for decision-making. then you definately learn how to use dates, strings, and different easy items of JavaScript. subsequent, you spot easy methods to use JavaScript to control items supplied through the browser, resembling kinds and home windows. From there, you progress into complex issues like utilizing cookies and dynamic HTML. upon getting an exceptional origin, you discover dynamic new release of web pages utilizing server-side scripting and back-end databases. and also you perform what you study through construction a pattern program as you pass. What does this booklet hide? listed below are a few of the issues you can find during this publication: What kinds of info are utilized in JavaScript easy methods to establish and proper flaws on your code options for programming the browser easy methods to use Microsoft Script Debugger and Netscape Script Debugger how one can deal with cross-browser concerns How JavaScript interacts with XML and HTML who's this publication for? This publication is for somebody who desires to research JavaScript programming. you'll have a few realizing of HTML and the way to create static websites, yet no previous programming adventure is important.

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Extra info for Beginning JavaScript Second Edition

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You must match the quotes surrounding strings. Escape characters allow you to include characters in your string that cannot be typed. • Variables are JavaScript's way of storing data, such as numbers and text, in memory so that they can be used again and again in your code. • Variable names must not include certain illegal characters, like % and &, or be a reserved word, like with. • Before we can give a value to a variable, we must declare its existence to the JavaScript interpreter. • JavaScript has the four basic math operators, represented by the symbols +, -, *, and /.

Then our code would be degCent = 5/9 * degFahren - 32; The calculation of 5/9 remains the same, but then JavaScript would have calculated the multiplication, 5/9 * degFahren. This is because the multiplication takes precedence over the subtraction. 7778. 2221; not the answer we want! Finally, in our script block, we display the answer using the alert() function. alert(degCent); That concludes our brief look at basic calculations with JavaScript. However, in Chapter 4 we'll be looking at something called the Math object, which enables us to do more complex calculations such as finding cosines, square roots, and much more.

What Happens when We Get an Error As we mentioned in the previous section, the use of a reserved word in a variable name will result in a JavaScript error in the browser. However, the error message displayed may not be instantly helpful since it may not indicate that you've used a reserved word in declaring your variables. Let's look at the sort of error messages you might see in this situation. Note that these error messages can also be produced by other mistakes not related to variable naming, which can get confusing at times.

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