Read e-book online Beginning JavaScript with DOM Scripting and Ajax: From PDF

By Christian Heilmann

ISBN-10: 1590596803

ISBN-13: 9781590596807

The book's name means that it is a e-book for newcomers in addition to skilled programmers, yet i would not suggest this publication to someone who's simply commencing to research JavaScript until you recognize an analogous scripting language. the 1st few chapters of the ebook clarify the fundamentals like info varieties and variables, yet then the writer all at once starts off throwing quite lengthy examples of code on the reader that would certainly confuse an green programmer. He ends each one bankruptcy with "now you understand how to do that, and that" that's problematical simply because he does not make an effort to provide an explanation for every little thing and simply assumes that you'll determine it out on your own. He additionally tells you to disregard a few elements of code and tells you that it'll be defined later within the e-book, but when you're like me and will not begin a brand new bankruptcy till you might have thoroughly understood the present bankruptcy this can be going to irritate you. you're feeling kind of like you've got skipped a bankruptcy or and now cannot comprehend what the writer is conversing approximately. it kind of feels like he simply determined that it might be more straightforward to only minimize and paste tremendous chunks of code to the booklet and upload short and sometimes imprecise reasons instead of take a extra conventional strategy. i'd suggest this e-book simply to those that understand JavaScript and wish to benefit new innovations and enhance their talents. when you are a newbie and simply beginning to research JavaScript purchase a "JavaScript for dummies" variety e-book and when you research the fundamentals learn this booklet to enhance your wisdom of JavaScript.

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Then all we need to do is write out the result using both variables. Not only is this script more functional, it’s also much easier to read. Converting Different Types of Data For the most part, the JavaScript interpreter can work out what data types we want to be used. write( myResponse ); If you enter 2 at the prompt, then you’ll be told that The number you entered + 1 = 12 Rather than add the two numbers together, the JavaScript interpreter has concatenated them. This is because the prompt() function actually returns the value entered by the user as a string data type, even though the string contains number characters.

This will help you get familiar with JavaScript a lot easier than the more modern and advanced techniques awaiting you in Chapter 3. ■Note There is also an “opposite” to the script tag—noscript—which allows you to add content that will only be displayed when JavaScript is not available. However, noscript is deprecated in XHTML and strict HTML, and there is no need for it—if you create JavaScript that is unobtrusive. book Page 8 Friday, June 9, 2006 3:19 PM 8 C H A P T E R 1 ■ GETTING STARTED WITH JAVASCRIPT JavaScript Syntax Before we go any further, we should discuss some JavaScript syntax essentials: • // indicates that the rest of the current line is a comment and not code to be executed, so the interpreter doesn’t try to run it.

Before we move on to a more detailed examination of the JavaScript language in the next chapter, let’s talk about something key to successful JavaScript development: objects. book Page 12 Friday, June 9, 2006 3:19 PM 12 C H A P T E R 1 ■ GETTING STARTED WITH JAVASCRIPT Objects Objects are central to the way we use JavaScript. Objects in JavaScript are in many ways like objects in the world outside programming (it does exist, I just had a look). In the real world, an object is just a “thing” (many books about object-oriented programming compare objects to nouns): a car, a table, a chair, and the keyboard I’m typing on.

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Beginning JavaScript with DOM Scripting and Ajax: From Novice to Professional by Christian Heilmann

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