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APPENDIX A
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The Ajax craftsperson s toolkit
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As well as having a foot in the enterprise-development camp, Ajax has roots in the web-design community, for whom an entirely different type of toolset has developed. Macromedia Dreamweaver and Microsoft FrontPage are two notable web-design tools of this type, and both offer support for the basic client-side technologies used by Ajax. Dreamweaver provides good support for basic JavaScript and CSS editing (figure A.3) and a two-way HTML editor with visual and text modes, but for WYSIWYG orchestration of complex JavaScript user interfaces, it supports only its own code library. Integrating third-party libraries such as x, Prototype, and Rico into a Dreamweaver or FrontPage project would require a lot of hand-crafting the scripts, making use of the text editor functionality of the tools and relatively little else. The final tool worth a mention here is ActiveState s Komodo, which is a crosslanguage scripting IDE, supporting Perl, Python, PHP, Tcl, JavaScript, and XSLT. Komodo has very good support for JavaScript codebase navigation and a sophis-
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Figure A.3 Dreamweaver s editor supports JavaScript and CSS. The CSS file being edited in the upper-right pane is also shown in outline form in the upper left.
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Debuggers
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Figure A.4 The Komodo IDE provides high-quality outlining features for JavaScript objects and can understand a number of coding idioms. Here the code outliner has recognized that various functions belong to the ObjectViewer prototype.
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ticated outliner that recognizes JavaScript classes as well as functions and methods (figure A.4). As a general-purpose scripting IDE, it deals only with JavaScript the generic language, not the browser-based implementations. As such, it is most useful when developing domain models for Ajax. Komodo is a commercial tool with free trials available. As an interesting aside, the Komodo UI is built using the XML -based XUL toolkit used to create the Firefox web browser. In the next section, we ll consider another key tool in the developer s arsenal: the source code debugger.
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A.3 Debuggers
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The behavior of simple computer programs can often be figured out by looking at the code, but larger, more complex programs are often too large to hold in your mind all at once. Debugger tools provide a way of controlling the flow of execution of a piece of running code, allowing it to be stopped and started manually and the state of the program inspected while it is running.
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APPENDIX A
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The Ajax craftsperson s toolkit
A.3.1 Why we use a debugger
Debuggers provide a very practical way of finding out what a program does. In any programming effort, a debugger can be useful in testing whether you have understood a piece of code correctly. In Ajax, this is particularly valuable. When the term debugger is used, most developers tend to think of source code debuggers, and server-side and JavaScript debuggers are indeed handy to have at your disposal when writing Ajax. However, it is also helpful to be able to debug network traffic when writing Ajax, as HTTP can be surprisingly complicated, too. In the following sections, we ll consider both source code and HTTP debugging tools. Let s look at the state of JavaScript debuggers first.
A.3.2 JavaScript debuggers
Being able to debug JavaScript code is especially useful because of the fluidity of the language. A C# or Java programmer generally knows which properties and methods are available on a given object by examining its class definition and knows the types and number of a method s arguments from its declared signature. It isn t always possible with JavaScript, though, to work out from the code how many arguments a function will be invoked with, or even what the variable this will resolve to inside a function. This latter issue is particularly problematic for callback handlers, for which the invocation of the function may be done by an unknown object or by the browser itself. At its simplest, a source code debugger allows the user to set breakpoints that halt program execution and hand it over to the user when that line of code is executed. The user may then step through the code a line at a time, inspecting the values of any variables that are in scope, or resume normal execution until the next breakpoint is encountered. In JavaScript, breakpoints may be set by the debugger tool itself or by the coder, by adding a debugger statement to the code. For example, when the browser executes the following code
var x=3; var y=x*7; debugger; var z=x+y;
control will be handed over to any debugger that is registered with the browser on the third line of code (figure A.5), at which point the values of variables x and y can be inspected. z has not been declared yet and so can be inspected only after the user has stepped the debugger forward over the fourth line.
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