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

By Christian Heilmann

The book's identify means that it is a ebook for rookies in addition to skilled programmers, yet i would not suggest this e-book to somebody who's simply commencing to research JavaScript except you recognize an identical scripting language. the 1st few chapters of the booklet clarify the fundamentals like information varieties and variables, yet then the writer unexpectedly begins throwing fairly lengthy examples of code on the reader that would certainly confuse an green programmer. He ends every one bankruptcy with "now you know the way to do that, and that" that's not easy simply because he does not take some time to provide 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 commence a brand new bankruptcy till you have got thoroughly understood the present bankruptcy this can be going to irritate you. you're feeling kind of like you could have skipped a bankruptcy or and now cannot comprehend what the writer is speaking approximately. it kind of feels like he simply determined that it might be more uncomplicated to simply reduce and paste sizeable chunks of code to the e-book and upload short and infrequently imprecise motives instead of take a extra conventional process. i might suggest this e-book in basic terms to those that understand JavaScript and wish to profit new recommendations and enhance their abilities. while you are a newbie and simply commencing to research JavaScript purchase a "JavaScript for dummies" variety e-book and when you study the fundamentals learn this ebook to enhance your wisdom of JavaScript.

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Object-oriented programming works with these concepts. This way of designing software is now very commonplace and influences many areas of programming—but most importantly to us, it’s central to JavaScript and web browser programming. Some of the objects we’ll be using are part of the language specification: the String object, the Date object, and the Math object, for example. The same objects would be available to JavaScript in a PDF file and on a web server. These objects provide lots of useful functionality that could save us tons of programming time.

Book Page 5 Friday, June 9, 2006 3:19 PM C H A P T E R 1 ■ GETTING STARTED WITH JAVASCRIPT Problems and Merits of JavaScript As I mentioned at the outset of this chapter, JavaScript has been an integral part of web development over the last few years, but it has also been used wrongly. As a result, it has gotten a bad reputation. ” A lot of this comes from the days of DHTML (more on this in Chapter 3). The term user agent and the lack of understanding what a user agent is can also be a problem.

The merits of using JavaScript are • Less server interaction: You can validate user input before sending the page off to the server. This saves server traffic, which means saving money. • Immediate feedback to the visitors: They don’t have to wait for a page reload to see if they have forgotten to enter something • Automated fixing of minor errors: For example, if you have a database system that expects a date in the format dd-mm-yyyy and the visitor enters it in the form dd/mm/yyyy, a clever JavaScript script could change this minor mistake prior to sending the form to the server.

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