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XBL

1,349 bytes added, 12:03, 6 October 2006
→‎How Does XBL Work?
=What is XBL?=
XBL stands for eXtensible Bindings Language, which is an XML language that is used for declaring the behaviours of XUL widgets. Bindings can be attached to elements using either cascading stylesheets or the document object model. The element that the binding is attached to, called the bound element, acquires the new behavior specified by the binding.
=What Does XBL stands for eXtensible Bindings LanguageDo?=Basically, which XBL is an XML language a langauge that is used for declaring the behavious describes a set of XUL widgets. Bindings bindings that can be attached and bound to elements using either cascading stylesheets or on the document object modelscreen. The element that When bound, the binding is attached implements new methods and properties to, called the bound associated element. In essence, acquires the new behavior specified by widgets on the bindingscreen are layed out using XUL and then given functionality using XBL.
=What How Does XBL DoWork?=::The XBL file used in developing XUL based applications is used to provide a specified set of functionality to individual elements that are rendered onto your screen.
Basically, ::In order to understand how XBL works we must first understand the XUL ecosystem and the design pattern on which it is based upon. ::Let us observe the figure below::::[[Image:Xbl_model.gif|http://www.mozilla.org/docs/xul/xulnotes/xbl_model.gif]]:::[http://www.mozilla.org/docs/xul/xulnotes/xbl_model.gif http://www.mozilla.org/docs/xul/xulnotes/xbl_model.gif]::Within a langauge that describes a set XUL, classes of bindings that can be attached and bound to elements on are skinned with the definitions in the screenCSS file. When bound, However the definitions in the binding implements new methods and properties CSS file are just pointers to the associated elementbindings in the XBL. In essence, Bindings that are used to give the widgets on the screen are layed out using XUL and then given elements functionality using XBLor perhaps add or make change in their property.
=How does XBL work?===XBL Elements==:'''Bindings'''::The design pattern used is '''Bindings'indirection (Delegation pattern)'' element contains many Binding elements.::'''DTD decleration'''::<pre>::<!ELEMENT bindings ( binding* ) > [ where * indicates zero or more one object relies upon another to provide a specified set of functionality. In this case the CSS file relies on the binding element]</pre>::'''XML representation'''::<pre><bindings in the XBL file to provide it with definitions and functionalities for the elements.This makes skinning XUL applications easy.All one has to do is to change the bindings in the XBL file in order to make changes to the behaviour of an element in the application interface.>:: <binding id="binding1">:: </binding>:: <binding id="binding2">:: </binding>::</bindings></pre>
:'''Binding''=What's in a XBL file?=*An XBL file is just an ordinary XML file.::The '''Binding''' element describes a single *An XBL file can contain many binding and can add (anonymous content, fields, properties, methods and event handlers) to any html or xml elementelements.
<pre>
<!ENTITY % binding-content ?xml version="1.0"(content?,implementation?,handlers?)> <bindings id="xulBindings" xmlns="http://www.mozilla.org/xbl" xmlns:html="http://www.w3.org/1999/xhtml" xmlns:xul="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"> <!ELEMENT binding %binding-id="thumb" extends="xul:box"> <content;> <!ATTLIST bindingxul:spring flex="1"/> id ID #REQUIRED <xul:image inherits="src"/> extends CDATA #IMPLIED <xul:spring flex="1"/> display CDATA #IMPLIED applyauthorstyles false #IMPLIED </content> styleexplicitcontent false #IMPLIED</binding>
</pre>
This syntax example is borrowed from :[http://www.mozilla.org/docs/xul/xulnotes/xulnote_xbl.html#syntax http://www.mozilla.org/docs/xul/xulnotes/xulnote_xbl.html#syntax].
=Resources/Examples=
==API Reference==
 
The [http://www.mozilla.org/projects/xbl/xbl.html Mozilla Webpage] has a list of Tags and examples that document the usage of XBL.
 
==Test Cases==
===Example 1===
[http://developer.mozilla.org/en/docs/CSS:Getting_Started:XBL_bindings XBL bindings Example]
===Example 2===
In this example, we can use XUL to define the layout of user interface and then use XBL to change the widgets functionality. <br/><br/>
<box class="okcancelbuttons"/>
</window>
</pre>
<pre>
button[type="okcancelbuttons"] {
-moz-binding: url("http://www.mozilla.org/xbl/htmlBindings.xml#okcancel");
}
</pre>
</bindings>
</pre>
 
==API Reference/Tutorials==
The [http://www.mozilla.org/projects/xbl/xbl.html Mozilla Webpage] has a list of Tags and examples that document the usage of XBL.
 
[http://www.mozilla.org/docs/xul/xulnotes/xulnote_xbl.html An XBL Primer]
==Newsgroup==
 
[http://groups.google.ca/group/netscape.public.mozilla.xbl netscape.public.mozilla.xbl]
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