Beginning JavaScript Second Edition by Paul Wilton

By Paul Wilton

What's this publication approximately? JavaScript is the popular programming language for web content purposes, letting you improve your websites with interactive, dynamic, and customized pages. This absolutely up-to-date consultant indicates you ways to exploit JavaScript’s client-side scripting innovations for the most recent types of Netscape and web Explorer, no matter if you’ve by no means programmed earlier than. you start with uncomplicated syntax and know about information forms and the way to constitution code for decision-making. then you definately discover ways to use dates, strings, and different easy gadgets of JavaScript. subsequent, you spot easy methods to use JavaScript to control gadgets supplied by means of the browser, resembling kinds and home windows. From there, you progress into complicated themes like utilizing cookies and dynamic HTML. upon getting a fantastic beginning, you discover dynamic new release of websites utilizing server-side scripting and back-end databases. and also you perform what you study by way of construction a pattern program as you pass. What does this ebook hide? listed here are a number of the issues you will find during this booklet: What forms of information are utilized in JavaScript how you can determine and proper flaws on your code thoughts for programming the browser how you can use Microsoft Script Debugger and Netscape Script Debugger how you can deal with cross-browser matters How JavaScript interacts with XML and HTML who's this publication for? This publication is for somebody who desires to study JavaScript programming. you'll have a few realizing of HTML and the way to create static web content, yet no previous programming adventure is critical.

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Additional resources for Beginning JavaScript Second Edition

Sample text

In the last chapter we wrote some code that converted temperature in degrees Fahrenheit to centigrade. We obtained the degrees Fahrenheit from the user using the prompt() function. This worked fine if the user entered a valid number, such as 50. If, however, the user entered something invalid for the Fahrenheit temperature, such as the string aaa, we find that our code no longer works as expected. Now, if we had some decision-making capabilities in our program, we could check to see if what the user has entered is valid.

For example: var myArray = new Array("Paul",345,"John",112,"Bob",99); Here, the first item of data, "Paul", will be put in the array with an index of 0. The next piece of data, 345, will be put in the array with an index of 1, and so on. This means that the element with the name myArray[0] contains the value "Paul", the element with name myArray[1] contains the value 345, and so on. Note that you can't use this method to declare an array containing just one piece of numerical data, such as 345, because JavaScript assumes that you are declaring an array that will hold 345 elements.

Then, to prove it has all worked, we show the value contained in answer by using our friend the alert() function. answer = firstNumber / secondNumber; alert(answer); Most calculations will be done in the third way; that is, using variables, or numbers and variables, and storing the result in another variable. The reason for this is that if the calculation used literal values (actual values, such as 15 / 10), then we might as well program in the result of the calculation, rather than force JavaScript to calculate it for us.

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