Download e-book for kindle: Beginning JavaScript Second Edition by Paul Wilton

By Paul Wilton

ISBN-10: 0764555871

ISBN-13: 9780764555879

ISBN-10: 0764573772

ISBN-13: 9780764573774

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 totally up to date consultant exhibits you ways to exploit JavaScript’s client-side scripting suggestions for the most recent models of Netscape and net Explorer, no matter if you’ve by no means programmed prior to. you start with easy syntax and know about information varieties and the way to constitution code for decision-making. then you definitely learn how to use dates, strings, and different uncomplicated items of JavaScript. subsequent, you spot the best way to use JavaScript to govern items supplied through the browser, akin to varieties and home windows. From there, you progress into complicated issues like utilizing cookies and dynamic HTML. once you have a great starting place, you discover dynamic iteration of web pages utilizing server-side scripting and back-end databases. and also you perform what you study by way of construction a pattern software as you cross. What does this e-book conceal? listed here are many of the issues you can find during this e-book: What different types of information are utilized in JavaScript how one can determine and proper flaws on your code concepts for programming the browser the right way to use Microsoft Script Debugger and Netscape Script Debugger how you can deal with cross-browser concerns How JavaScript interacts with XML and HTML who's this publication for? This e-book is for an individual who desires to study JavaScript programming. you'll have a few figuring out of HTML and the way to create static websites, yet no previous programming event is important.

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Additional info for Beginning JavaScript Second Edition

Example text

Htm. write("myArray[1] changed to " + myArray[1]); If you load this into your web browser, you should see a web page that looks something like the one shown in Figure 2-15. Figure 2-15 How It Works Our first task in our script block is to declare a variable and tell the JavaScript interpreter we want it to be a new array. var myArray = new Array(); Now that we have our array defined, we can store some data in it. Each time we store an item of data with a new index, JavaScript automatically creates a new storage space for it.

In other words, they perform some calculation or operation and return a result to us. You can use the results of these calculations almost anywhere you'd use a number or a variable. Let's imagine we were calculating the total value of items on a shopping list. We could write this calculation as Total cost of shopping = 10 + 5 + 5 or, if we actually calculate the sum, it's Total cost of shopping = 20 Now let's see how we would do this in JavaScript. In actual fact, it is very similar except that we need to use a variable to store the final total.

Arrays are a special type of variable that can hold more than one piece of data. The data is inserted and accessed using a unique index number. Chapter 2: Data Types and Variables 55 56 Chapter 2: Data Types and Variables Exercise Questions Suggested solutions to these questions can be found in Appendix A. Question 1 Q: A: Write a JavaScript program to convert degrees centigrade into degrees Fahrenheit, and write the result to the page in a descriptive sentence. htm. We get the degrees centigrade the user wants to convert by using the prompt() function, and store it inside the degCent variable.

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