com.sencha.gxt.core.client.dom

Class DomIdProvider

java.lang.Object

com.sencha.gxt.core.client.dom.DomIdProvider

public class DomIdProvider
extends Object

Replacable class that provides IDs for elements and widgets. By default, asks XDOM for a new unique ID, but can be customized and replaced to (for example) provide an ID based on specific attributes about the widget or its location in the application.

While not required, IDs are strongly encouraged to be legal to use in CSS expressions without any escaping, as various tools such as HtmlLayoutContainer, DomQuery, and XElement will do no escaping when using them. According to http://www.w3.org/TR/CSS21/grammar.html#scanner, these IDs should match this grammar:

 %option case-insensitive

 h              [0-9a-f]
 nonascii       [\240-\377]
 unicode                \\{h}{1,6}(\r\n|[ \t\r\n\f])?
 escape         {unicode}|\\[^\r\n\f0-9a-f]
 nmstart                [_a-z]|{nonascii}|{escape}
 nmchar         [_a-z0-9-]|{nonascii}|{escape}
 ident          -?{nmstart}{nmchar}*
 

or roughly expressed as a regex, -?[_a-zA-Z][_a-zA-Z0-9-]*.

You can replace the default implementation of this class with your own type that extends it through a replace-with directive in your module file, something like this:

 <replace-with class="path.to.my.CustomDomIdProvider">
   <when-type-is class="com.sencha.gxt.core.client.dom.DomIdProvider" />
 </replace-with>
 

In that custom implementation, you can override the two non-static methods: #generateIdForElement(com.google.gwt.dom.client.Element), and #generateIdForWidget(com.google.gwt.user.client.ui.Widget).

Constructor Summary

Constructors

Constructor and Description
DomIdProvider()

Method Summary

Modifier and Type	Method and Description
static String	generateId(Element element)
static String	generateId(Widget widget)
String	generateIdForElement(Element element)
String	generateIdForWidget(Widget widget)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DomIdProvider

public DomIdProvider()

Method Detail

generateId

public static String generateId(Widget widget)

generateId

public static String generateId(Element element)

generateIdForElement

public String generateIdForElement(Element element)

generateIdForWidget

public String generateIdForWidget(Widget widget)