Download Beginning JavaScript with DOM Scripting and Ajax: From by Christian Heilmann PDF

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By Christian Heilmann

The book's identify means that it is a ebook for newcomers in addition to skilled programmers, yet i would not suggest this e-book to someone who's simply beginning to research JavaScript except you recognize an analogous scripting language. the 1st few chapters of the publication clarify the fundamentals like facts kinds and variables, yet then the writer without warning starts off throwing quite lengthy examples of code on the reader that would certainly confuse an green programmer. He ends every one bankruptcy with "now you understand how to do that, and that" that is not easy simply because he does not make an effort to give an explanation for every little thing and simply assumes that you're going to 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 may have thoroughly understood the present bankruptcy this can be going to irritate you. you are feeling just like you could have skipped a bankruptcy or and now cannot comprehend what the writer is conversing approximately. it kind of feels like he simply made up our minds that it might be more uncomplicated to only reduce and paste gigantic chunks of code to the publication and upload short and infrequently imprecise motives instead of take a extra conventional process. i might suggest this e-book in simple terms to those that comprehend JavaScript and need to benefit new suggestions and enhance their talents. while you are a newbie and simply commencing to examine JavaScript purchase a "JavaScript for dummies" style booklet and when you research the fundamentals learn this e-book to enhance your wisdom of JavaScript.

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Write( '

Applied Style: '+ resolutionInfo + '

' ); Later on, we’ll be working with more complex examples that use JavaScript to test capabilities of the user’s agent and interface. For now though, I hope this simple example gives you an inkling of the kind of flexibility you can add to your web pages using JavaScript. book Page 16 Friday, June 9, 2006 3:19 PM 16 C H A P T E R 1 ■ GETTING STARTED WITH JAVASCRIPT Summary In this chapter, we’ve taken a look at what JavaScript is, how it works, and what its advantages and disadvantages are.

Book Page 23 Wednesday, June 14, 2006 12:33 PM CHAPTER 2 ■ DATA AND DECISIONS This is how the calculations for the preceding are performed: (1 + 1) = 2 (2 + 3) = 5 2 * 5 = 10 10 * 5 = 50 As we’ve seen, JavaScript’s addition operator adds the values. What it actually does with the two values depends on the data type that you’re using. For example, if you’re working with two numbers that have been stored as the number data type, the + operator will add them together. However, if one of the data types you’re working with is a string (as indicated by the delimiters), the two values will be concatenated.

AvailWidth < 650 ) If the user’s screen is 640× 480, then the width is less than 650, so the code within the curly braces is executed and the low-resolution style and message get defined. css'; resolutionInfo = 'low resolution'; } The code carries on checking the screen size using the else statement. css'; resolutionInfo = 'medium resolution'; } It’s also worth noting that we’re measuring the screen size here, and the user may have a 800× 600 screen, but that doesn’t mean their browser window is maximized.

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