org.apache.wicket.ajax

Class AjaxEventBehavior

java.lang.Object

org.apache.wicket.behavior.Behavior

org.apache.wicket.behavior.AbstractAjaxBehavior

org.apache.wicket.ajax.AbstractDefaultAjaxBehavior

org.apache.wicket.ajax.AjaxEventBehavior

All Implemented Interfaces:

Serializable, IComponentAwareEventSink, IRequestListener, IComponentAwareHeaderContributor, org.apache.wicket.util.io.IClusterable

Direct Known Subclasses:

AjaxFormComponentUpdatingBehavior, AjaxFormSubmitBehavior, AjaxPagingNavigationBehavior, AjaxPreventSubmitBehavior

public abstract class AjaxEventBehavior
extends AbstractDefaultAjaxBehavior

An ajax behavior that is attached to a certain client-side (usually javascript) event, such as click, change, keydown, etc.

Example:

         WebMarkupContainer div=new WebMarkupContainer(...);
         div.setOutputMarkupId(true);
         div.add(new AjaxEventBehavior("click") {
             protected void onEvent(AjaxRequestTarget target) {
                 System.out.println("ajax here!");
             }
         }
 

This behavior will be linked to the click javascript event of the div WebMarkupContainer represents, and so anytime a user clicks this div the onEvent(AjaxRequestTarget) of the behavior is invoked.

Note: getEvent() method cuts any on prefix from the given event name(s). This is being done for easier migration of applications coming from Wicket 1.5.x where Wicket used inline attributes like 'onclick=...'. If the application needs to use custom events with names starting with on then getEvent() should be overridden.

Since:

1.2

Author:

Igor Vaynberg (ivaynberg)

See Also:

onEvent(AjaxRequestTarget), Serialized Form

Field Summary

Fields inherited from class org.apache.wicket.ajax.AbstractDefaultAjaxBehavior

INDICATOR

Constructor Summary

Constructors

Constructor and Description
AjaxEventBehavior(String event) Construct.

Method Summary

Modifier and Type	Method and Description
String	getEvent()
protected abstract void	onEvent(AjaxRequestTarget target) Listener method for the ajax event
static AjaxEventBehavior	onEvent(String eventName, org.danekja.java.util.function.serializable.SerializableConsumer<AjaxRequestTarget> onEvent) Creates an AjaxEventBehavior based on lambda expressions
void	renderHead(Component component, IHeaderResponse response) Render to the web response whatever the component wants to contribute to the head section.
protected void	respond(AjaxRequestTarget target)
protected void	updateAjaxAttributes(AjaxRequestAttributes attributes) Gives a chance to the specializations to modify the attributes.

Methods inherited from class org.apache.wicket.ajax.AbstractDefaultAjaxBehavior

findIndicatorId, getAttributes, getCallbackFunction, getCallbackFunctionBody, getCallbackScript, getCallbackScript, onBind, onRequest, postprocessConfiguration, renderAjaxAttributes, renderAjaxAttributes

Methods inherited from class org.apache.wicket.behavior.AbstractAjaxBehavior

afterRender, bind, getCallbackUrl, getComponent, onComponentRendered, onComponentTag, onComponentTag, onUnbind, unbind

Methods inherited from class org.apache.wicket.behavior.Behavior

beforeRender, canCallListener, detach, getStatelessHint, isEnabled, isTemporary, onAttribute, onConfigure, onEvent, onException, onRemove, onTag

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wicket.IRequestListener

rendersPage

Constructor Detail

AjaxEventBehavior

public AjaxEventBehavior(String event)

Construct.

Parameters:

event - the event this behavior will be attached to

Method Detail

renderHead

public void renderHead(Component component,
                       IHeaderResponse response)

Description copied from class: Behavior

Render to the web response whatever the component wants to contribute to the head section.

Specified by:

renderHead in interface IComponentAwareHeaderContributor

Overrides:

renderHead in class AbstractDefaultAjaxBehavior

Parameters:

component - component which is contributing to the response. This parameter is here to give the component as the context for component-awares implementing this interface

response - Response object

See Also:

Behavior.renderHead(Component, org.apache.wicket.markup.head.IHeaderResponse)

updateAjaxAttributes

protected void updateAjaxAttributes(AjaxRequestAttributes attributes)

Description copied from class: AbstractDefaultAjaxBehavior

Gives a chance to the specializations to modify the attributes.

Overrides:

updateAjaxAttributes in class AbstractDefaultAjaxBehavior

getEvent

public String getEvent()

Returns:

event the event this behavior is attached to

respond

protected final void respond(AjaxRequestTarget target)

Specified by:

respond in class AbstractDefaultAjaxBehavior

Parameters:

target - The AJAX target

onEvent

protected abstract void onEvent(AjaxRequestTarget target)

Listener method for the ajax event

Parameters:

target - the current request handler

onEvent

public static AjaxEventBehavior onEvent(String eventName,
                                        org.danekja.java.util.function.serializable.SerializableConsumer<AjaxRequestTarget> onEvent)

Creates an AjaxEventBehavior based on lambda expressions

Parameters:

eventName - the event name

onEvent - the SerializableConsumer which accepts the AjaxRequestTarget

Returns:

the AjaxEventBehavior