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In light of all of the changes in the web programming landscape since the 1998 publication of the previous edition, David Flanagan's JavaScript : The Definitive Guide, 4th Edition (JS:TDG4) was overdue. Flanagan delivers a book that more than measures up to its predecessor -- JS:TDG4 includes a substantial amount of new material and, as a whole, has been extensively updated. The crushing gain in browser market share by Microsoft's Internet Explorer offering, the maturation of the Netscape 6.x,7.x / Mozilla browser suite and its entry into the fray along with a slew of other Gecko-based browsers, promulgation of newer versions of the ECMAScript specification (accompanied by new implementations in JavaScript and Jscript), and the publication of successive W3C DOM Recommendations are all reflected in this edition.
Although much of the core of the language, addressed in Part I, has changed relatively little since the 3rd Edition, Flanagan has added coverage of new issues that have emerged in the past several years, such as the discussion of ASCII, Latin-1, and 16-bit Unicode in the beginning of Chapter 2 (ECMA-262 Edition 1, the spec that defined ECMAScript, included Unicode support for il8n purposes, so ECMAScript compliance requires Unicode support). He has also pruned away quite a bit of material related to NS 4.x-proprietary features, like the explanation of import and export (previously found in Chapter 6), that are naturally of increasingly less interest to developers as that line of browsers recedes into history.
Much of Part II, which considers client-side JavaScript and DOM in all its glory, is entirely new or has been completely re-written. Where the chapter on the Document Object model in the 3rd edition only covered the "Level 0" DOM (the objects, properties, and methods first exposed by the 4.0 browsers), JS:TDG4 tackles the Level 0 DOM and the W3C DOM Recommendations through level 1 Core and HTML and touches on some DOM Level 2 topics, including the Range and Traversal APIs. "Cascading Style Sheets and Dynamic HTML" and "Events and Event Handling" are two other chapters in the Client-Side JavaScript section that have really come into their own in this edition.
The large (more than 300 pages), but muddled "JavaScript Reference" in the 3rd edition (it had commingled the objects, properties, and methods included in the core of the JavaScript language with those of the Level 0 DOM) has been split into 4 discrete appendices ("Core JavaScript Reference", "Client-Side JavaScript Reference", "W3C DOM Reference", and "Class, Property, Method, and Event Handler Index") that, taken together, comprise more than 400 more pages of information. NS 4.x fans can take comfort from the fact that, while much NS 4.x-specific information has been culled from the body of the text, Netscape 4.x still shows up in some screen captures (along with Microsoft Internet Explorer and Netscape 6).
-- Brian Donovan (brian@monokromatik.com)
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Explanation of ERCB rating scale:
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