Package org.apache.wicket.extensions.ajax

Class AjaxDownloadBehavior

java.lang.Object

org.apache.wicket.behavior.Behavior

org.apache.wicket.behavior.AbstractAjaxBehavior

org.apache.wicket.ajax.AbstractDefaultAjaxBehavior

org.apache.wicket.extensions.ajax.AjaxDownloadBehavior

All Implemented Interfaces:

Serializable, IComponentAwareEventSink, IRequestListener, IComponentAwareHeaderContributor, IClusterable

public class AjaxDownloadBehavior
extends AbstractDefaultAjaxBehavior

Download resources via Ajax.

Usage:

 final AjaxDownloadBehavior download = new AjaxDownloadBehavior(resource);
 add(download);

 add(new AjaxButton("download")
 {
        @Override
        protected void onSubmit(IPartialPageRequestHandler handler, Form<?> form)
        {
                download.initiate(handler);
        }
 });
 

To set the name of the downloaded resource make use of ResourceStreamResource.setFileName(String) or AbstractResource.ResourceResponse.setFileName(String)

Author:

svenmeier, Martin Grigorov, Maxim Solodovnik

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static enum	AjaxDownloadBehavior.Location

Field Summary

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

INDICATOR

Constructor Summary

Constructors

Constructor	Description
AjaxDownloadBehavior(IResource resource)	Download of a IResource.
AjaxDownloadBehavior(ResourceReference reference)	Download of a ResourceReference.
AjaxDownloadBehavior(ResourceReference reference, PageParameters resourceParameters)	Download of a ResourceReference.

Method Summary

Modifier and Type	Method	Description
AjaxDownloadBehavior.Location	getLocation()
CookieDefaults.SameSite	getSameSite()
void	initiate(IPartialPageRequestHandler handler)	Call this method to initiate the download.
void	initiate(IPartialPageRequestHandler handler, PageParameters resourceParameters)	Call this method to initiate the download.
static void	markCompleted(IResource.Attributes attributes)	Mark a resource as complete.
static void	markCompleted(IResource.Attributes attributes, CookieDefaults.SameSite sameSite)	Mark a resource as complete.
protected void	onBeforeDownload(IPartialPageRequestHandler handler)
protected void	onBind()	Subclasses should call super.onBind()
protected void	onDownloadCompleted(AjaxRequestTarget target)	A callback executed when the download of the resource finished successfully or with a failure.
protected void	onDownloadFailed(AjaxRequestTarget target)	A callback executed when the download of the resource failed for some reason, e.g.
protected void	onDownloadSuccess(AjaxRequestTarget target)	A callback executed when the download of the resource finished successfully.
protected void	onUnbind()	Called when the behavior is removed from its component.
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)
AjaxDownloadBehavior	setLocation(AjaxDownloadBehavior.Location location)
void	setSameSite(CookieDefaults.SameSite sameSite)	Setter for the same CookieDefaults.SameSite

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

findIndicatorId, getAttributes, getCallbackFunction, getCallbackFunctionBody, getCallbackScript, getCallbackScript, onMethodMismatch, onRequest, postprocessConfiguration, renderAjaxAttributes, renderAjaxAttributes, updateAjaxAttributes

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

afterRender, bind, getCallbackUrl, getComponent, onComponentRendered, onComponentTag, onComponentTag, 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 Details

AjaxDownloadBehavior

public AjaxDownloadBehavior(IResource resource)

Download of a IResource.

Parameters:

resource - resource to download

AjaxDownloadBehavior

public AjaxDownloadBehavior(ResourceReference reference)

Download of a ResourceReference.

The IResource returned by ResourceReference.getResource() must call markCompleted(Attributes) when responding, otherwise the callback onDownloadSuccess(AjaxRequestTarget) will not work.

Parameters:

reference - reference to resource to download

AjaxDownloadBehavior

public AjaxDownloadBehavior(ResourceReference reference,
 PageParameters resourceParameters)

Download of a ResourceReference.

The IResource returned by ResourceReference.getResource() must call markCompleted(Attributes) when responding, otherwise the callback onDownloadSuccess(AjaxRequestTarget) will not work.

Parameters:

reference - reference to resource to download

resourceParameters - parameters for the resource

Method Details

onBind

protected void onBind()

Description copied from class: AbstractDefaultAjaxBehavior

Subclasses should call super.onBind()

Overrides:

onBind in class AbstractDefaultAjaxBehavior

See Also:

• AbstractAjaxBehavior.onBind()

onUnbind

protected void onUnbind()

Description copied from class: AbstractAjaxBehavior

Called when the behavior is removed from its component. The bound host component is still available through AbstractAjaxBehavior.getComponent(). The relation to it will be removed right after the finish of the execution of this method.

Overrides:

onUnbind in class AbstractAjaxBehavior

initiate

public void initiate(IPartialPageRequestHandler handler,
 PageParameters resourceParameters)

Call this method to initiate the download. You can use the resourceParameters to dynamically pass information to the IResource in order to generate contents.

Parameters:

handler - the initiating RequestHandler

resourceParameters - Some PageParameters that might be used by the resource in order to generate content

initiate

public void initiate(IPartialPageRequestHandler handler)

Call this method to initiate the download.

Parameters:

handler - the initiating RequestHandler

onBeforeDownload

protected void onBeforeDownload(IPartialPageRequestHandler handler)

onDownloadSuccess

protected void onDownloadSuccess(AjaxRequestTarget target)

A callback executed when the download of the resource finished successfully.

Parameters:

target - The Ajax request handler

onDownloadFailed

protected void onDownloadFailed(AjaxRequestTarget target)

A callback executed when the download of the resource failed for some reason, e.g. an error at the server side.

Since the HTTP status code of the download is not available to Wicket, any HTML in the resource response will be interpreted as a failure HTTP status message. Thus is it not possible to download HTML resources via AjaxDownloadBehavior.

Parameters:

target - The Ajax request handler

onDownloadCompleted

protected void onDownloadCompleted(AjaxRequestTarget target)

A callback executed when the download of the resource finished successfully or with a failure.

Parameters:

target - The Ajax request handler

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)

respond

protected void respond(AjaxRequestTarget target)

Specified by:

respond in class AbstractDefaultAjaxBehavior

Parameters:

target - The AJAX target

getLocation

public AjaxDownloadBehavior.Location getLocation()

setLocation

public AjaxDownloadBehavior setLocation(AjaxDownloadBehavior.Location location)

markCompleted

public static void markCompleted(IResource.Attributes attributes)

Mark a resource as complete.

Has to be called from IResource.respond(Attributes) when downloaded via AjaxDownloadBehavior(IResource).

Parameters:

attributes - resource attributes

markCompleted

public static void markCompleted(IResource.Attributes attributes,
 CookieDefaults.SameSite sameSite)

Mark a resource as complete.

Has to be called from IResource.respond(Attributes) when downloaded via AjaxDownloadBehavior(IResource).

Parameters:

attributes - resource attributes

sameSite - The same site attribute used to mark a download completed.

getSameSite

public CookieDefaults.SameSite getSameSite()

Returns:

The CookieDefaults.SameSite attribute to be used for the complete download.

setSameSite

public void setSameSite(CookieDefaults.SameSite sameSite)

Setter for the same CookieDefaults.SameSite

Parameters:

sameSite - The non-null sameSite attribute