📄 part 3 javascript programming with dojo and dijit the dojo toolkit.mht
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Subject: Part 3: JavaScript Programming With Dojo and Dijit | The Dojo Toolkit
Date: Sun, 2 Dec 2007 16:35:13 +0800
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<H2 class=3Dtitle>The Book of Dojo</H2>
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<LI class=3Dexpanded id=3Dmenu-item-296><A=20
href=3D"http://dojotoolkit.org/book/dojo-book-0-9-0">The Book of =
Dojo</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-1-life-dojo/quick-=
installation">Quick=20
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href=3D"http://dojotoolkit.org/book/book-dojo/part-4-meta-dojo-making-you=
r-dojo-code-run-faster-and-better/debugging-facilities/deb">Debugging=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/introduction">Introduct=
ion</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-1-life-dojo-0">Par=
t 1:=20
Life With Dojo</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-2-dijit-0">Part =
2:=20
Dijit</A>=20
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3: JavaScript With Dojo and Dijit</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/functions-used-everywhere">Functions=20
Used Everywhere</A>=20
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=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/object-orientation">Object=20
Orientation</A>=20
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it-and-dojo/modules-and-namespaces">Modules</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
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Widgets Through Code</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
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Your Own Widget Class</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/event-system">The=20
Event System</A>=20
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(XHR)</A>=20
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it-and-dojo/drag-and-drop">Drag=20
and Drop</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/data-retrieval-dojo-data-0">Using=20
dojo.data</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/selecting-dom-nodes-dojo-query">Selecting=20
DOM Nodes with dojo.query</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/i18n">i18n</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/back-button-undo">Back=20
Button</A>=20
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=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/other-miscellaneous-function">Other=20
Functions</A> </LI></UL>
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-4-meta-dojo-0">Par=
t 4:=20
Testing, Tuning and Debugging</A>=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-5-dojox-extensions=
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5: DojoX</A> </LI></UL>
<LI class=3Dcollapsed id=3Dmenu-item-54><A title=3D"The Dojo Book, =
0.4"=20
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0.4</A>=20
</LI></UL></DIV></DIV></DIV></DIV>
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<H2>Part 3: JavaScript Programming With Dojo and Dijit</H2><!--Node: -->
<DIV class=3Dnode>
<DIV class=3Dsubmitted>Submitted by criecke on Sat, 04/28/2007 - =
19:23.</DIV>
<DIV class=3Dcontent>
<P>In addition to being useful in itself, Dijit is a testament to Dojo's =
solidness and performance. The fact that you can build a really nice, =
extensible=20
widget framework on top of it shows how cool Dojo is.</P>
<P>But that's only the beginning. Other Dojo-based mini-frameworks like=20
dojo.data and dojox.offline allow you to build data sources and offline =
storage,=20
respectively, in object oriented fashion. With a bit of JavaScript, you =
can use=20
these services and many others bundled with Dojo for your own Web 2.0=20
applications:</P>
<UL>
<LI><B>Object Oriented Class Helpers</B> - JavaScript uses =
prototype-based,=20
not class-based, object orientation natively. Dojo essentially =
builds a=20
class system on top, adding great features like inheritance, =
encapsulation,=20
mixin classes, and more. This will make Java and C# programmers =
feel at=20
home, and help build solid Enterprise-level applications.
<LI><B>Modules</B> - As your client code grows, it's harder to keep =
all=20
functions and global variables from using the same name and wrecking =
each=20
other. Dojo adds a module system on top of JavaScript as part of =
its=20
class layer. Modules are like packages in Java.
<LI><B>Dijit Methods</B> - As we've seen, you can create Dijit =
components=20
programmatically - perfect for when you need 1000 tree nodes, for=20
example. You can also build your own Dijit widget classes, and =
extend=20
the ones already there.
<LI><B>Events</B> - Dojo generalizes the event system already present =
in=20
JavaScript. You can connect events to code, and the resulting =
app works=20
in Firefox, IE, and Safari without modification. It also =
introduces=20
"double-blind" publish/subscribe events - perfect for loosely-coupled =
code.
<LI><B>XHR (Ajax)</B> - Dojo adds a nice wrapper around native =
XmlHttpRequest=20
services. Often you can boil an XHR message-pass with one =
function=20
call. The data is given to you in text, XML, or in a JavaScript =
object=20
via JSON. =20
<LI><B>Drag and Drop</B> - Often the bane of DHTML applications, drag =
and drop=20
services are essential for easy user interaction. Dojo's DnD =
layer is=20
fast, cross-platform, and very straightforward.
<LI><B>Dojo.data</B> - The Data module is an abstraction layer that =
makes=20
gathering data from outside sources consistent. Reading from a =
database=20
or web service uses the same base calls. You can write pluggable =
data=20
modules for your own sources.
<LI><B>Dojo.query</B> - Finding and manipulating HTML fragments is=20
difficult. But Dojo.query makes it as easy as CSS. You can =
write=20
sophsticated selectors, then apply an operation to all of them in one =
step.
<LI><B>i18n</B> - Short for "Internationalization" ("i", "n" and the =
18=20
characters between them), Dojo i18n services help make all of your =
code=20
globally accessible with understandable date, number and currency =
formats, and=20
translated resource bundles.=20
<LI><B>Back button handling</B> - dojo.back saves your application =
from=20
nervous users trying to use the Back button. One-page apps can destroy =
data at=20
one touch of the back button. dojo.back alters the behavior of Back to =
make it=20
less likely.=20
<LI><B>And more, more more!</B> - As your apps get sophsiticated, you =
can also=20
write them compactly using Dojo's language extension features, HTML =
style=20
functions, cookie functions, and much more! </LI></UL>
<DIV class=3Dbook-navigation>
<UL class=3Dmenu>
<LI class=3Dcollapsed><A=20
=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/functions-used-everywhere">Functions=20
Used Everywhere</A>
<LI class=3Dcollapsed><A=20
=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/object-orientation">Object=20
Orientation</A>
<LI class=3Dcollapsed><A=20
=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/modules-and-namespaces">Modules</A>
<LI class=3Dcollapsed><A=20
=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/manipulating-widgets-through-code">Manipulating=20
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