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<H2>Writing Your Own Widget Class</H2><!--Node: -->
<DIV class=3Dnode>
<DIV class=3Dsubmitted>Submitted by dante on Tue, 06/05/2007 - =
18:23.</DIV>
<DIV class=3Dcontent>
<P>It's hard for you to leave well-enough alone. We give you widgets, =
and now=20
you want to change them. Or you want to make your own. </P>
<P>No problem! Dijit components are extendible, so you can make changes =
without=20
touching the source code. In a way, you already do this by specifying =
your own=20
attributes - e.g. sliders that go from 0-100 look different than those =
going=20
from 0-200. But sometimes you need to go further. Maybe you need to =
create=20
different behavior for onClick, or substitute a custom validation =
routine. This=20
kind of modification uses <I>extension points</I> described in <A=20
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-2-dijit/common-att=
ributes">Common=20
Attributes</A>. You can add your own code to extension points through =
markup or=20
through pure JavaScript calls to dojo.declare.</P>
<P>You can also create Dijit classes from scratch. Again, you can do =
this either=20
through markup - using the dijit.Declaration dojoType attribute - or =
through=20
dojo.declare. </P>
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=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/writing-your-own-widget-class/widget-life-cycl">The=20
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href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/writing-your-own-widget-class/testing-widget">Testing=20
the Widget</A>
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=
href=3D"http://dojotoolkit.org/book/dojo-book-0-9/part-3-programmatic-dij=
it-and-dojo/manipulating-widgets-through-code/writing-yo-0">Example:=20
File Upload Dialog Box</A>
<LI class=3Dleaf><A=20
=
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