org.zkoss.zk.ui
Interface Page

All Superinterfaces:
IdSpace, Scope
All Known Implementing Classes:
AbstractPage, PageImpl

public interface Page
extends IdSpace, Scope

A page. A desktop consists of a set of pages.

When a ZK request is asking to render a new page, a new page is created and components that are created duing this request all belong to this page.

If a ZK requst is asking an update, it must have at lease one UUID of a component (Component.getUuid(). From this UUID, we know which page it belongs and activate it to process the update.

By activation, the system guarantees no concurrent access to pages and components (so you don't need use synchronized for them).

Desktop

In portal and some environments, a client request (e.g., ServletRequest) might consists of several ZK requests (AuRequest). While each ZK request might ask to create an independent page, all these pages are grouped as a desktop, such that they are activated and removed at the same time. Moreover, pages in the same desktop could communicate to eath other (see Inter-page communication).

A session, Session, might have multiple desktops of pages, Page, while a page belongs to exactly one session. A page, Page, might have many components, Component, while a component belongs to exactly one page.

All components of the same desktop of pages are removed at the same time if a page become 'obsolete'.

During each execution (${link Execution}), exactly one desktop of pages are locked (aka., activated). Though an execution serves a client request (e.g., ServletRequest), a client request might consist of multiple ZK request (AuRequest). Each ZK request might target to a different page (of the same desktop).

Inter-page Communication

To do inter-page communication, you could do:

  1. Invoke methods of components from another page directly.
  2. Use Execution.postEvent(org.zkoss.zk.ui.event.Event) to post events to components from another page.

They are the same as handling components from the same page. However, invoking method directly for components from another page has one restriction:
It cannot create component.

Author:
tomyeh

Field Summary
static int APPLICATION_SCOPE
          Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the whole application.
static int DESKTOP_SCOPE
          Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same desktop.
static int PAGE_SCOPE
          Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same page.
static int REQUEST_SCOPE
          Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same request.
static int SESSION_SCOPE
          Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same session.
 
Method Summary
 boolean addEventListener(java.lang.String evtnm, EventListener listener)
          Adds an event listener to specified event for all components in this page.
 void addFunctionMapper(FunctionMapper mapper)
          Adds the function mapper in addition to the current one.
 boolean addVariableResolver(VariableResolver resolver)
          Adds a name resolver that will be used to resolve a variable by getVariable(java.lang.String).
 boolean containsVariable(java.lang.String name)
          Deprecated. As of release 5.0.0, replaced with hasAttributeOrFellow(java.lang.String, boolean).

Returns whether the specified variable is defined.

 java.lang.Object getAttribute(java.lang.String name)
          Returns the value of the specified attribute associated with this page.
 java.lang.Object getAttribute(java.lang.String name, int scope)
          Returns the value of the specified custom attribute in the specified scope.
 java.lang.Object getAttributeOrFellow(java.lang.String name, boolean recurse)
          Returns the custom attribute associated with this page, or the fellow of this page; or null if no found.
 java.util.Map getAttributes()
          Returns all custom attributes associated with this page.
 java.util.Map getAttributes(int scope)
          Returns all custom attributes of the specified scope.
 ComponentDefinition getComponentDefinition(java.lang.Class cls, boolean recurse)
          Returns the component definition of the specified class, or null if not found.
 ComponentDefinition getComponentDefinition(java.lang.String name, boolean recurse)
          Returns the component definition of the specified name, or null if not found.
 ComponentDefinitionMap getComponentDefinitionMap()
          Returns the map of component definitions (never null).
 Desktop getDesktop()
          Returns the desktop that this page belongs to.
 java.lang.Class getExpressionFactoryClass()
          Returns the implementation of the expression factory that is used by this page, or null if Configuration.getExpressionFactoryClass() is used.
 Component getFirstRoot()
          Returns the first root component.
 FunctionMapper getFunctionMapper()
          Returns the function mapper for resolving XEL functions, or null if not available.
 java.lang.String getId()
          Returns ID which is unique in the request (never null).
 Interpreter getInterpreter(java.lang.String zslang)
          Returns the interpreter of the specified scripting language.
 LanguageDefinition getLanguageDefinition()
          Returns the language definition that this page belongs to (never null).
 Component getLastRoot()
          Returns the last root component.
 java.util.Iterator getListenerIterator(java.lang.String evtnm)
          Returns an iterator for iterating listener for the specified event.
 java.util.Collection getLoadedInterpreters()
          Returns all loaded interpreters.
 Namespace getNamespace()
          Deprecated. As of release 5.0.0, the concept of namespace is deprecated, and please use the attributes of an ID space (such as page) instead.

Returns the namespace used to store variables belonging to the ID space of this page.

 java.lang.String getRequestPath()
          Returns the request path of this page, or "" if not available.
 java.util.Collection getRoots()
          Returns a readonly list of the root components.
 java.lang.String getStyle()
          Returns the CSS style of this page, or empty if not specified.
 java.lang.String getTitle()
          Returns the title of the desktop this page belongs to (and evaluate it if it contains an expression).
 java.lang.String getUuid()
          Returns UUID (universal unique ID) which is unquie in the whole session.
 java.lang.Object getVariable(java.lang.String name)
          Deprecated. As of release 5.0.0, replaced with getAttributeOrFellow(java.lang.String, boolean).

Returns the value of a variable defined in the namespace (getNamespace()).

 java.lang.Object getXelVariable(java.lang.String name)
          Returns a variable that is visible to XEL expressions.
 java.lang.Object getXelVariable(XelContext ctx, java.lang.Object base, java.lang.Object name, boolean ignoreExec)
          Returns a vairable that is visible to XEL expressions.
 java.lang.Class getZScriptClass(java.lang.String clsnm)
          Returns the class of the specified name by searching the thread class loader and the classes defined in the loaded interpreters.
 Function getZScriptFunction(Component comp, java.lang.String name, java.lang.Class[] argTypes)
          Returns the function of the specified name by searching the logical scope of the specified component in all the loaded interpreters.
 Function getZScriptFunction(Namespace ns, java.lang.String name, java.lang.Class[] argTypes)
          Deprecated. As of release 5.0.0, replaced with getZScriptFunction(Component,String,Class[])

Returns the function of the specified name by searching the logical scope of the specified namespace in all the loaded interpreters.

 Function getZScriptFunction(java.lang.String name, java.lang.Class[] argTypes)
          Returns the function of the specified name by searching the loaded interpreters.
 java.lang.String getZScriptLanguage()
          Returns the default scripting language which is assumed when a zscript element doesn't specify any language.
 java.lang.Object getZScriptVariable(Component comp, java.lang.String name)
          Returns the value of the variable of the specified name by searching the logical scope of the specified component in all the loaded interpreters, if any.
 java.lang.Object getZScriptVariable(Namespace ns, java.lang.String name)
          Deprecated. As of release 5.0.0, replaced with getZScriptVariable(Component, String).

Returns the value of the variable of the specified name by searching the logical scope of the specified namespace in all the loaded interpreters, if any.

 java.lang.Object getZScriptVariable(java.lang.String name)
          Returns the value of the variable of the specified name by searching the loaded interpreters, if any.
 boolean hasAttribute(java.lang.String name)
          Returns if an attribute exists.
 boolean hasAttribute(java.lang.String name, int scope)
          Returns if an attribute exists.
 boolean hasAttributeOrFellow(java.lang.String name, boolean recurse)
          Returns if a custom attribute is associated with this page, or a fellow of this page.
 void interpret(java.lang.String zslang, java.lang.String script, Namespace ns)
          Deprecated. As of release 5.0.0, replaced with interpret(String,String,Scope).

Interpret a script of the specified scripting language against the specified namespace.

 void interpret(java.lang.String zslang, java.lang.String script, Scope scope)
          Interprets a script in the sepcified scripting language in the context of the specified scope.
 void invalidate()
          Invalidates this page to cause all components to redraw.
 boolean isComplete()
          Returns if this page is a complete page.
 boolean isListenerAvailable(java.lang.String evtnm)
          Returns whether the event listener is available.
 java.lang.Object removeAttribute(java.lang.String name)
          Removes the specified attribute custom associated with the page.
 java.lang.Object removeAttribute(java.lang.String name, int scope)
          Removes the specified custom attribute in the specified scope.
 void removeComponents()
          Removes all components in this page.
 boolean removeEventListener(java.lang.String evtnm, EventListener listener)
          Removes an event listener.
 boolean removeVariableResolver(VariableResolver resolver)
          Removes a name resolve that was added by addVariableResolver(org.zkoss.xel.VariableResolver).
 java.lang.Class resolveClass(java.lang.String clsnm)
          Resolves the class of the specified name.
 java.lang.Object setAttribute(java.lang.String name, java.lang.Object value)
          Sets the value of the specified custom attribute associated with this page.
 java.lang.Object setAttribute(java.lang.String name, java.lang.Object value, int scope)
          Sets the value of the specified custom attribute in the specified scope.
 void setComplete(boolean complete)
          Sets if the page is a complete page.
 void setExpressionFactoryClass(java.lang.Class expfcls)
          Sets the implementation of the expression factory that is used by this page.
 void setId(java.lang.String id)
          Sets the identifier of this page.
 void setStyle(java.lang.String style)
          Sets the CSS style of this page.
 void setTitle(java.lang.String title)
          Sets the title of the desktop this page belongs to (it might contain an expression).
 void setVariable(java.lang.String name, java.lang.Object val)
          Deprecated. As of release 5.0.0, replaced with setAttribute(java.lang.String, java.lang.Object, int).

Sets a variable to the namespace (getNamespace()).

 void setZScriptLanguage(java.lang.String zslang)
          Sets the defafult scripting language which will be assumed if a zscript element doesn't specify any language.
 void unsetVariable(java.lang.String name)
          Deprecated. As of release 5.0.0, replaced with removeAttribute(java.lang.String, int).

Unsets a variable from the namespace (getNamespace()).

 
Methods inherited from interface org.zkoss.zk.ui.IdSpace
getFellow, getFellow, getFellowIfAny, getFellowIfAny, getFellows, hasFellow, hasFellow
 
Methods inherited from interface org.zkoss.zk.ui.ext.Scope
addScopeListener, getAttribute, hasAttribute, removeAttribute, removeScopeListener, setAttribute
 

Field Detail

PAGE_SCOPE

static final int PAGE_SCOPE
Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same page.

It is also known as the page attributes.

It is the same as getAttributes(int).

See Also:
Constant Field Values

DESKTOP_SCOPE

static final int DESKTOP_SCOPE
Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same desktop.

It is also known as the desktop attributes.

It is the same as Desktop.getAttributes().

See Also:
Constant Field Values

SESSION_SCOPE

static final int SESSION_SCOPE
Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same session.

It is also known as the session attributes.

It is the same as Session.getAttributes().

See Also:
Constant Field Values

APPLICATION_SCOPE

static final int APPLICATION_SCOPE
Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the whole application.

It is also known as the application attributes.

It is the same as WebApp.getAttributes().

See Also:
Constant Field Values

REQUEST_SCOPE

static final int REQUEST_SCOPE
Used with getAttribute(java.lang.String, int) and relevants to denote custom attributes shared by the same request.

It is also known as the request attributes.

It is the same as Execution.getAttributes().

See Also:
Constant Field Values
Method Detail

getId

java.lang.String getId()
Returns ID which is unique in the request (never null).

Note: it returns null when Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) is called.


setId

void setId(java.lang.String id)
Sets the identifier of this page.

Note: you can change the page's ID only in Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) or ExecutionInit.init(org.zkoss.zk.ui.Execution, org.zkoss.zk.ui.Execution). Once the page is initialized (by PageCtrl.init(org.zkoss.zk.ui.sys.PageConfig)), calling this method will cause an exception.

Throws:
UiException - if the page is initialized, i.e., PageCtrl.init(org.zkoss.zk.ui.sys.PageConfig) is called.

getUuid

java.lang.String getUuid()
Returns UUID (universal unique ID) which is unquie in the whole session. The UUID is generated automatically and immutable.

It is mainly used for communication between client and server and you rarely need to access it.


getTitle

java.lang.String getTitle()
Returns the title of the desktop this page belongs to (and evaluate it if it contains an expression).

Default: "".


setTitle

void setTitle(java.lang.String title)
Sets the title of the desktop this page belongs to (it might contain an expression).


getStyle

java.lang.String getStyle()
Returns the CSS style of this page, or empty if not specified.


setStyle

void setStyle(java.lang.String style)
Sets the CSS style of this page.

Note: Unlike setTitle(java.lang.String), you can change the style only in the lifecycle of the loading page.


getRequestPath

java.lang.String getRequestPath()
Returns the request path of this page, or "" if not available.

It is the same as the servlet path (javax.servlet.http.HttpServletRequest's getServletPath), if ZK is running at a servlet container.

Note: Desktop.getRequestPath() returns the request path that causes the desktop to create. And, there might be multiple pages in the same desktop.

See Also:
Execution.getContextPath(), Desktop.getRequestPath()

getDesktop

Desktop getDesktop()
Returns the desktop that this page belongs to.

Note: it returns null when Initiator.doInit(org.zkoss.zk.ui.Page, java.util.Map) is called.


getRoots

java.util.Collection getRoots()
Returns a readonly list of the root components.


getFirstRoot

Component getFirstRoot()
Returns the first root component.

Since:
3.5.2

getLastRoot

Component getLastRoot()
Returns the last root component.

Since:
3.5.2

getAttributes

java.util.Map getAttributes(int scope)
Returns all custom attributes of the specified scope. You could reference them directly, or thru componentScope, spaceScope, pageScope, requestScope and desktopScope in zscript and EL.

If scope is PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Parameters:
scope - APPLICATION_SCOPE, SESSION_SCOPE, PAGE_SCOPE, REQUEST_SCOPE or DESKTOP_SCOPE.

getAttribute

java.lang.Object getAttribute(java.lang.String name,
                              int scope)
Returns the value of the specified custom attribute in the specified scope.

If scope is PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Parameters:
scope - APPLICATION_SCOPE, SESSION_SCOPE, PAGE_SCOPE, REQUEST_SCOPE or DESKTOP_SCOPE.

hasAttribute

boolean hasAttribute(java.lang.String name,
                     int scope)
Returns if an attribute exists.

Notice that null is a valid value, so you need this method to really know if an atribute is defined.

Since:
5.0.0

setAttribute

java.lang.Object setAttribute(java.lang.String name,
                              java.lang.Object value,
                              int scope)
Sets the value of the specified custom attribute in the specified scope.

If scope is PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Parameters:
scope - APPLICATION_SCOPE, SESSION_SCOPE, PAGE_SCOPE, REQUEST_SCOPE or DESKTOP_SCOPE.

removeAttribute

java.lang.Object removeAttribute(java.lang.String name,
                                 int scope)
Removes the specified custom attribute in the specified scope.

If scope is PAGE_SCOPE, it means custom attributes shared by components from the same page as this one's.

If scope is DESKTOP_SCOPE, it means custom attributes shared by components from the same desktopas this one's.

Parameters:
scope - APPLICATION_SCOPE, SESSION_SCOPE, PAGE_SCOPE, REQUEST_SCOPE or DESKTOP_SCOPE.

getAttributes

java.util.Map getAttributes()
Returns all custom attributes associated with this page.

Specified by:
getAttributes in interface Scope

getAttribute

java.lang.Object getAttribute(java.lang.String name)
Returns the value of the specified attribute associated with this page.

Specified by:
getAttribute in interface Scope

hasAttribute

boolean hasAttribute(java.lang.String name)
Returns if an attribute exists.

Notice that null is a valid value, so you need this method to really know if an atribute is defined.

Specified by:
hasAttribute in interface Scope
Since:
5.0.0

setAttribute

java.lang.Object setAttribute(java.lang.String name,
                              java.lang.Object value)
Sets the value of the specified custom attribute associated with this page.

Specified by:
setAttribute in interface Scope
Parameters:
value - the value.
Returns:
the previous value associated with the attribute, if any

removeAttribute

java.lang.Object removeAttribute(java.lang.String name)
Removes the specified attribute custom associated with the page.

Specified by:
removeAttribute in interface Scope
Returns:
the previous value associated with the attribute, if any,

getAttributeOrFellow

java.lang.Object getAttributeOrFellow(java.lang.String name,
                                      boolean recurse)
Returns the custom attribute associated with this page, or the fellow of this page; or null if no found.

Notice that this method will NOT check for any variable defined in the variable resolver (addVariableResolver(org.zkoss.xel.VariableResolver)). You have to invoke getXelVariable(XelContext,Object,Object,boolean) or getXelVariable(String) manually.

Parameters:
recurse - whether to look up the desktop/session for the existence of the attribute.
Since:
5.0.0

hasAttributeOrFellow

boolean hasAttributeOrFellow(java.lang.String name,
                             boolean recurse)
Returns if a custom attribute is associated with this page, or a fellow of this page.

Notice that this method will NOT check for any variable defined in the variable resolver (addVariableResolver(org.zkoss.xel.VariableResolver)). You have to invoke getXelVariable(XelContext,Object,Object,boolean) or getXelVariable(String) manually.

Parameters:
recurse - whether to look up the desktop/session for the existence of the attribute.
Since:
5.0.0

setVariable

void setVariable(java.lang.String name,
                 java.lang.Object val)
Deprecated. As of release 5.0.0, replaced with setAttribute(java.lang.String, java.lang.Object, int).

Sets a variable to the namespace (getNamespace()).


containsVariable

boolean containsVariable(java.lang.String name)
Deprecated. As of release 5.0.0, replaced with hasAttributeOrFellow(java.lang.String, boolean).

Returns whether the specified variable is defined.


getVariable

java.lang.Object getVariable(java.lang.String name)
Deprecated. As of release 5.0.0, replaced with getAttributeOrFellow(java.lang.String, boolean).

Returns the value of a variable defined in the namespace (getNamespace()).


unsetVariable

void unsetVariable(java.lang.String name)
Deprecated. As of release 5.0.0, replaced with removeAttribute(java.lang.String, int).

Unsets a variable from the namespace (getNamespace()).


getZScriptClass

java.lang.Class getZScriptClass(java.lang.String clsnm)
Returns the class of the specified name by searching the thread class loader and the classes defined in the loaded interpreters.

Note: if not defined in the interpeter, it will also look for the class by use of the current thread's class loader. See resolveClass(java.lang.String).

Returns:
the class, or null if not found
See Also:
getLoadedInterpreters()

resolveClass

java.lang.Class resolveClass(java.lang.String clsnm)
                             throws java.lang.ClassNotFoundException
Resolves the class of the specified name. It first looks at Classes and then all loaded interpreters getLoadedInterpreters().

It is similar to getZScriptClass(java.lang.String), except

  1. It searches the current thread's class loader first, and then, the loaded interpreters.
  2. It throws ClassNotFoundException if not found

Throws:
java.lang.ClassNotFoundException
Since:
3.0.1
See Also:
getZScriptClass(java.lang.String)

getZScriptFunction

Function getZScriptFunction(java.lang.String name,
                            java.lang.Class[] argTypes)
Returns the function of the specified name by searching the loaded interpreters.

Returns:
the method, or null if not found
Since:
3.0.0
See Also:
getLoadedInterpreters()

getZScriptFunction

Function getZScriptFunction(Namespace ns,
                            java.lang.String name,
                            java.lang.Class[] argTypes)
Deprecated. As of release 5.0.0, replaced with getZScriptFunction(Component,String,Class[])

Returns the function of the specified name by searching the logical scope of the specified namespace in all the loaded interpreters.

Parameters:
ns - the namespace used as a reference to identify the correct scope for searching the variable. It is ignored if the interpreter doesn't support hierachical scopes. Note: this method doesn't look for any variable stored in ns.
Returns:
the method, or null if not found
Since:
2.4.1
See Also:
getLoadedInterpreters()

getZScriptFunction

Function getZScriptFunction(Component comp,
                            java.lang.String name,
                            java.lang.Class[] argTypes)
Returns the function of the specified name by searching the logical scope of the specified component in all the loaded interpreters.

Parameters:
comp - the component to start the search. If null, this method searches only the page's attributes. In other words, if comp is null, this method is the same as getZScriptFunction(String, Class[]).
Since:
3.0.0

getZScriptVariable

java.lang.Object getZScriptVariable(java.lang.String name)
Returns the value of the variable of the specified name by searching the loaded interpreters, if any.

Returns:
the value of the variable, or null if not found
See Also:
getLoadedInterpreters()

getZScriptVariable

java.lang.Object getZScriptVariable(Namespace ns,
                                    java.lang.String name)
Deprecated. As of release 5.0.0, replaced with getZScriptVariable(Component, String).

Returns the value of the variable of the specified name by searching the logical scope of the specified namespace in all the loaded interpreters, if any.

Parameters:
ns - the namespace used as a reference to identify the correct scope for searching the variable. It is ignored if the interpreter doesn't support hierachical scopes. Note: this method doesn't look for any variable stored in ns.

getZScriptVariable

java.lang.Object getZScriptVariable(Component comp,
                                    java.lang.String name)
Returns the value of the variable of the specified name by searching the logical scope of the specified component in all the loaded interpreters, if any.

Parameters:
comp - the component as the context to look for the variable defined in an interpreter. If null, the context is assumed to be this page.
Since:
3.0.0

getXelVariable

java.lang.Object getXelVariable(java.lang.String name)
Returns a variable that is visible to XEL expressions. It is a shortcut of getXelVariable(null, null, name, false).

This method is mainly used to access special variable, such as request parameters (if this page is requested by HTTP).

Since:
3.0.0
See Also:
getXelVariable(XelContext, Object, Object, boolean)

getXelVariable

java.lang.Object getXelVariable(XelContext ctx,
                                java.lang.Object base,
                                java.lang.Object name,
                                boolean ignoreExec)
Returns a vairable that is visible to XEL expressions.

Unlike getXelVariable(String), this method can utilitize VariableResolverX introduced in ZK 5.0.

Parameters:
ctx - the XEL context
base - the base object. If null, it looks for a top-level variable. If not null, it looks for a member of the base object (such as getter).
name - the property to retrieve.
ignoreExec - whether to ignore the current execution (Execution.getVariableResolver(). If true, it invokes only the variable resolvers define in this page (addVariableResolver(org.zkoss.xel.VariableResolver)). If false, it will first check the execution, so the implicit objects such as page and desktop will be resolved.
Since:
5.0.0
See Also:
getXelVariable(String)

addVariableResolver

boolean addVariableResolver(VariableResolver resolver)
Adds a name resolver that will be used to resolve a variable by getVariable(java.lang.String).

Note: the variables resolved by the specified resolver are accessible to both zscript and EL expressions.

Returns:
wether the resolver is added successfully. Note: if the resolver was added before, it won't be added again and this method returns false.

removeVariableResolver

boolean removeVariableResolver(VariableResolver resolver)
Removes a name resolve that was added by addVariableResolver(org.zkoss.xel.VariableResolver).

Returns:
false if resolved is not added before.

addEventListener

boolean addEventListener(java.lang.String evtnm,
                         EventListener listener)
Adds an event listener to specified event for all components in this page.

Due to performance consideration, unlike Component.addEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener), all event listeners for the page are deferrable, no matter Deferrable is implemented or not.

Parameters:
evtnm - what event to listen (never null)
Returns:
whether the listener is added; false if it was added before.
See Also:
Component.addEventListener(java.lang.String, org.zkoss.zk.ui.event.EventListener)

removeEventListener

boolean removeEventListener(java.lang.String evtnm,
                            EventListener listener)
Removes an event listener.

Returns:
whether the listener is removed; false if it was never added.

isListenerAvailable

boolean isListenerAvailable(java.lang.String evtnm)
Returns whether the event listener is available.


getListenerIterator

java.util.Iterator getListenerIterator(java.lang.String evtnm)
Returns an iterator for iterating listener for the specified event.


removeComponents

void removeComponents()
Removes all components in this page.

See Also:
Execution.createComponents(String,Component,Map)

invalidate

void invalidate()
Invalidates this page to cause all components to redraw.


getNamespace

Namespace getNamespace()
Deprecated. As of release 5.0.0, the concept of namespace is deprecated, and please use the attributes of an ID space (such as page) instead.

Returns the namespace used to store variables belonging to the ID space of this page.

See Also:
interpret(java.lang.String, java.lang.String, org.zkoss.zk.scripting.Namespace)

interpret

void interpret(java.lang.String zslang,
               java.lang.String script,
               Namespace ns)
Deprecated. As of release 5.0.0, replaced with interpret(String,String,Scope).

Interpret a script of the specified scripting language against the specified namespace.

Parameters:
zslang - the scripting language. If null, getZScriptLanguage() is assumed.
ns - the namspace. If null, the current namespace is assumed. The current namespace is the event target's namespace (Event.getTarget()), if the thread is processing an event. Otherwise, the current namespace is this page's namespace

interpret

void interpret(java.lang.String zslang,
               java.lang.String script,
               Scope scope)
Interprets a script in the sepcified scripting language in the context of the specified scope.

Parameters:
zslang - the scripting language. If null, getZScriptLanguage() is assumed.
scope - the scope used as the context. Since a component is a scope, you can pass a component as the context. By context we mean the attribute of the scope, its space owner, spacer owner's space owner, page and desktop will be searched. If null, this page is assumed.
Since:
5.0.0

getInterpreter

Interpreter getInterpreter(java.lang.String zslang)
Returns the interpreter of the specified scripting language.

The interpreter will be loaded and initialized, if it is not loaded yet.

Parameters:
zslang - the scripting language. If null, getZScriptLanguage() is assumed.
Throws:
InterpreterNotFoundException - if not found.

getLoadedInterpreters

java.util.Collection getLoadedInterpreters()
Returns all loaded interpreters.


getZScriptLanguage

java.lang.String getZScriptLanguage()
Returns the default scripting language which is assumed when a zscript element doesn't specify any language.

Returns:
the default scripting language, say, Java. Never null.

setZScriptLanguage

void setZScriptLanguage(java.lang.String zslang)
                        throws InterpreterNotFoundException
Sets the defafult scripting language which will be assumed if a zscript element doesn't specify any language.

Throws:
InterpreterNotFoundException - if no such language

getExpressionFactoryClass

java.lang.Class getExpressionFactoryClass()
Returns the implementation of the expression factory that is used by this page, or null if Configuration.getExpressionFactoryClass() is used.

Default: null.

Since:
3.0.4
See Also:
setExpressionFactoryClass(java.lang.Class)

setExpressionFactoryClass

void setExpressionFactoryClass(java.lang.Class expfcls)
Sets the implementation of the expression factory that is used by this page.

Parameters:
expfcls - the class that implements ExpressionFactory, If null, Configuration.getExpressionFactoryClass() is used.
Since:
3.0.4
See Also:
getExpressionFactoryClass()

isComplete

boolean isComplete()
Returns if this page is a complete page. By complete we mean the page has everything that the client expects. For example, for HTML browsers, the page will generate the HTML, HEAD and BODY tags.

It is meaningful only if it is the top-level page (i.e., not included by the include component).

Default: false. It means ZK loader will enclose the page content with HTML/HEAD/BODY if necessary (such as not included by other Servlet).

If you have a page that has a complete HTML page and it is included by other page, you have to specify the complete flag to be true.

Since:
3.0.4

setComplete

void setComplete(boolean complete)
Sets if the page is a complete page.

Default: false. It means a page is complete if and only if it is not included by other page.

Parameters:
complete - whether the page is complete. If true, this page is assumed to be complete no matter it is included or not. If false, this page is assumed to be complete if it is not included by other page.
Since:
3.0.4
See Also:
isComplete()

getFunctionMapper

FunctionMapper getFunctionMapper()
Returns the function mapper for resolving XEL functions, or null if not available.

Since:
3.0.0

addFunctionMapper

void addFunctionMapper(FunctionMapper mapper)
Adds the function mapper in addition to the current one.

The new added function mapper has the higher priority. getFunctionMapper() will return the new

Parameters:
mapper - the new function mapper (null to ignore).

getLanguageDefinition

LanguageDefinition getLanguageDefinition()
Returns the language definition that this page belongs to (never null).


getComponentDefinitionMap

ComponentDefinitionMap getComponentDefinitionMap()
Returns the map of component definitions (never null).

Note: the map is shared among all instance of the same page definition. Any component definition added (by ComponentDefinitionMap.add(org.zkoss.zk.ui.metainfo.ComponentDefinition)) are visible to all other instances of the same page definition. Thus, it is NOT a good idea to change its content.


getComponentDefinition

ComponentDefinition getComponentDefinition(java.lang.String name,
                                           boolean recurse)
Returns the component definition of the specified name, or null if not found.

Note: unlike LanguageDefinition.getComponentDefinition(java.lang.String), this method doesn't throw ComponentNotFoundException if not found. It just returns null.

Parameters:
recurse - whether to look up the component from getLanguageDefinition()

getComponentDefinition

ComponentDefinition getComponentDefinition(java.lang.Class cls,
                                           boolean recurse)
Returns the component definition of the specified class, or null if not found.

Note: unlike LanguageDefinition.getComponentDefinition(java.lang.String), this method doesn't throw ComponentNotFoundException if not found. It just returns null.

Parameters:
recurse - whether to look up the component from getLanguageDefinition()


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