Beginning JavaScript with DOM Scripting and Ajax (2nd by Christian Heilmann, Russ Ferguson

By Christian Heilmann, Russ Ferguson

Starting JavaScript with DOM Scripting and Ajax is a vital source for contemporary JavaScript programming. This thoroughly up to date moment version covers every thing you must recognize to get up-to-speed with JavaScript improvement and upload dynamic improvements to web content, correct from the fundamentals. in addition to concentrating on client-side JavaScript, additionally, you will methods to paintings with the Browser item version, the rfile item version (DOM), the best way to use XML and JSON in addition to converse with carrier facet scripts comparable to Hypertext Preprocessor. learn the way to:
* build solid JavaScript syntax following smooth coding practices
* Use JavaScript to speak with the server and retrieve data
* Dynamically manage markup, validate types and take care of images
* Debug purposes utilizing beneficial properties contained in the browser

JavaScript is likely one of the most vital applied sciences on the net. It offers the skill so as to add dynamic performance for your websites and serves because the spine of Ajax-style net improvement. starting JavaScript with DOM Scripting and Ajax will take you from being a JavaScript beginner to paintings freely with this significant expertise - start your JavaScript trip this present day!

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Extra resources for Beginning JavaScript with DOM Scripting and Ajax (2nd Edition)

Example text

It only gets worse from here. userAgent will give you more mixed results. 0)” for IE 10 on Windows 7. Reading out the browser name and version—commonly known as browser sniffing—is not advisable, not only because of the inconsistencies I just pointed out, but also because it makes your script dependent on a certain browser rather than supporting any user agent that is actually capable of supporting the script. The solution to this problem is called object detection, and it basically means that we determine whether a user agent supports a certain object and makes this our key differentiator.

JavaScript as the Behavior Layer Web development can be thought of as being made up of several different layers, as shown in Figure 3-1: 50 • The behavior layer: Is executed on the client and defines how different elements behave when the user interacts with them (JavaScript or ActionScript for Flash sites). • The presentation layer: Is displayed on the client and specifies the look of the web page (CSS, imagery). • The structure layer: Is converted or displayed by the user agent. This is the markup defining what a certain text or media is (HTML).

Browser and version dependence: A common way to test whether the script could be executed was to read out the browser name in the navigator object. Because a lot of these scripts were created when Netscape 4 and Internet Explorer 5 were state-of-the-art, they failed to support newer browsers—the reason being that browser detection didn’t take newer versions into account and just tested for versions 4 or 5. • Code forking: Because different browsers supported different DOMs, a lot of code needed to be duplicated and several browser quirks needed to be avoided.

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