org.apache.wicket.markup.html.link

Class Link<T>

java.lang.Object

org.apache.wicket.Component

org.apache.wicket.MarkupContainer

org.apache.wicket.markup.html.WebMarkupContainer

org.apache.wicket.markup.html.link.AbstractLink

org.apache.wicket.markup.html.link.Link<T>

Type Parameters:

T - type of model object

All Implemented Interfaces:

Serializable, Iterable<Component>, IEventSink, IEventSource, IFeedbackContributor, IConverterLocator, IGenericComponent<T,Link<T>>, IRequestListener, IHeaderContributor, IRequestableComponent, IHierarchical<Component>, IClusterable

Direct Known Subclasses:

AjaxFallbackLink, BookmarkablePageLink, BreadCrumbLink, DownloadLink, DummyHomePage.TestLink, OrderByLink, PagingNavigationIncrementLink, PagingNavigationLink, PopupCloseLink, ResourceLink, StatelessLink, TabbedPanelPage.CssSwitchingLink

public abstract class Link<T>
extends AbstractLink
implements IRequestListener, IGenericComponent<T,Link<T>>

Implementation of a hyperlink component. A link can be used with an anchor (<a href...) element or any element that supports the onclick javascript event handler (such as buttons, td elements, etc). When used with an anchor, a href attribute will be generated. When used with any other element, an onclick javascript event handler attribute will be generated.

You can use a link like:

 add(new Link("myLink")
 {
     public void onClick()
     {
         // do something here...
     }
 );
 

and in your HTML file:

  <a href="#" wicket:id="myLink">click here</a>
 

or:

  <td wicket:id="myLink">my clickable column</td>
 

The following snippet shows how to pass a parameter from the Page creating the Page to the Page responded by the Link.

 add(new Link<MyObject>("link", listItem.getModel())
 {
     public void onClick()
     {
         MyObject obj = getModelObject();
         setResponsePage(new MyPage(obj));
     }
 

Author:

Jonathan Locke, Eelco Hillenius

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.wicket.Component

ENABLE, FLAG_INITIALIZED, FLAG_RESERVED1, FLAG_RESERVED2, FLAG_RESERVED3, FLAG_RESERVED4, FLAG_RESERVED5, FLAG_RESERVED8, PARENT_PATH, PATH_SEPARATOR, RENDER, RFLAG_CONTAINER_DEQUEING, RFLAG_CONTAINER_HAS_REMOVALS

Constructor Summary

Constructors

Constructor and Description
Link(String id)
Link(String id, IModel<T> model)

Method Summary

Modifier and Type	Method and Description
protected CharSequence	appendAnchor(ComponentTag tag, CharSequence url) Appends any anchor to the url if the url is not null and the url does not already contain an anchor (url.indexOf('#') != -1).
Component	getAnchor() Gets any anchor component.
boolean	getAutoEnable() Gets whether link should automatically enable/disable based on current page.
protected CharSequence	getOnClickScript(CharSequence url)
PopupSettings	getPopupSettings() Gets the popup specification.
protected boolean	getStatelessHint() Returns whether the component can be stateless.
protected CharSequence	getURL() Gets the url to use for this link.
boolean	isEnabled() Gets whether this component is enabled.
protected boolean	linksTo(Page page) Whether this link refers to the given page.
abstract void	onClick() Called when a link is clicked.
protected void	onComponentTag(ComponentTag tag) Handles this link's tag.
void	onRequest() THIS METHOD IS NOT PART OF THE WICKET API.
Link<T>	setAnchor(Component anchor) Sets an anchor component.
Link<T>	setAutoEnable(boolean autoEnable) Sets whether this link should automatically enable/disable based on current page.
Link<T>	setPopupSettings(PopupSettings popupSettings) Sets the popup specification.

Methods inherited from class org.apache.wicket.markup.html.link.AbstractLink

disableLink, getBody, onComponentTagBody, onDetach, setBody

Methods inherited from class org.apache.wicket.markup.html.WebMarkupContainer

getWebApplication, getWebPage, getWebRequest, getWebResponse, getWebSession

Methods inherited from class org.apache.wicket.MarkupContainer

add, addDequeuedComponent, addOrReplace, autoAdd, canDequeueTag, contains, dequeue, dequeue, dequeuePreamble, findChildComponent, findComponentToDequeue, get, getAssociatedMarkup, getAssociatedMarkupStream, getMarkup, getMarkupType, getRegionMarkup, internalAdd, internalInitialize, iterator, iterator, newDequeueContext, onInitialize, onRender, queue, remove, remove, removeAll, renderAll, renderAssociatedMarkup, renderNext, replace, setDefaultModel, size, stream, streamChildren, toString, toString, visitChildren, visitChildren

Methods inherited from class org.apache.wicket.Component

add, addStateChange, beforeRender, canCallListener, canCallListenerAfterExpiry, checkComponentTag, checkComponentTagAttribute, checkHierarchyChange, clearOriginalDestination, configure, continueToOriginalDestination, createConverter, debug, detach, detachModel, detachModels, determineVisibility, error, exceptionMessage, fatal, findMarkupStream, findPage, findParent, findParentWithAssociatedMarkup, getAjaxRegionMarkupId, getApplication, getBehaviorById, getBehaviorId, getBehaviors, getBehaviors, getClassRelativePath, getConverter, getDefaultModel, getDefaultModelObject, getDefaultModelObjectAsString, getDefaultModelObjectAsString, getEscapeModelStrings, getFeedbackMessages, getFlag, getId, getInnermostModel, getInnermostModel, getLocale, getLocalizer, getMarkup, getMarkupAttributes, getMarkupId, getMarkupId, getMarkupIdFromMarkup, getMarkupIdImpl, getMarkupSourcingStrategy, getMetaData, getModelComparator, getOutputMarkupId, getOutputMarkupPlaceholderTag, getPage, getPageRelativePath, getParent, getPath, getRenderBodyOnly, getRequest, getRequestCycle, getRequestFlag, getResponse, getSession, getSizeInBytes, getString, getString, getString, getStyle, getVariation, hasBeenRendered, hasErrorMessage, hasFeedbackMessage, info, initModel, internalOnModelChanged, internalRenderComponent, internalRenderHead, isActionAuthorized, isAuto, isBehaviorAccepted, isEnableAllowed, isEnabledInHierarchy, isIgnoreAttributeModifier, isInitialized, isRenderAllowed, isRendering, isStateless, isVersioned, isVisibilityAllowed, isVisible, isVisibleInHierarchy, markRendering, modelChanged, modelChanging, newMarkupSourcingStrategy, onAfterRender, onBeforeRender, onConfigure, onEvent, onModelChanged, onModelChanging, onReAdd, onRemove, redirectToInterceptPage, remove, remove, render, renderComponentTag, rendered, renderHead, renderPart, renderPlaceholderTag, replaceComponentTagBody, replaceWith, sameInnermostModel, sameInnermostModel, send, setAuto, setDefaultModelObject, setEnabled, setEscapeModelStrings, setFlag, setIgnoreAttributeModifier, setMarkup, setMarkupId, setMarkupIdImpl, setMetaData, setOutputMarkupId, setOutputMarkupPlaceholderTag, setParent, setRenderBodyOnly, setResponsePage, setResponsePage, setResponsePage, setVersioned, setVisibilityAllowed, setVisible, success, urlFor, urlFor, urlFor, urlForListener, urlForListener, visitParents, visitParents, warn, wrap

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.wicket.IRequestListener

rendersPage

Methods inherited from interface org.apache.wicket.IGenericComponent

getDefaultModel, getDefaultModelObject, getModel, getModelObject, setDefaultModel, setDefaultModelObject, setModel, setModelObject

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Constructor Detail

Link

public Link(String id)

See Also:

Component.Component(String)

Link

public Link(String id,
            IModel<T> model)

Parameters:

id -

model -

See Also:

Component.Component(String, IModel)

Method Detail

getAnchor

public Component getAnchor()

Gets any anchor component.

Returns:

Any anchor component to jump to, might be null

getAutoEnable

public final boolean getAutoEnable()

Gets whether link should automatically enable/disable based on current page.

Returns:

Whether this link should automatically enable/disable based on current page.

getPopupSettings

public final PopupSettings getPopupSettings()

Gets the popup specification. If not-null, a javascript on-click event handler will be generated that opens a new window using the popup properties.

Returns:

the popup specification.

isEnabled

public boolean isEnabled()

Description copied from class: Component

Gets whether this component is enabled. Specific components may decide to implement special behavior that uses this property, like web form components that add a disabled='disabled' attribute when enabled is false.

Overrides:

isEnabled in class Component

Returns:

Whether this component is enabled.

See Also:

Component.isEnabled()

getStatelessHint

protected boolean getStatelessHint()

Description copied from class: Component

Returns whether the component can be stateless. Also the component behaviors must be stateless, otherwise the component will be treat as stateful. In order for page to be stateless (and not to be stored in session), all components (and component behaviors) must be stateless.

Overrides:

getStatelessHint in class Component

Returns:

whether the component can be stateless

See Also:

Component.getStatelessHint()

onClick

public abstract void onClick()

Called when a link is clicked.

onRequest

public void onRequest()

THIS METHOD IS NOT PART OF THE WICKET API. DO NOT ATTEMPT TO OVERRIDE OR CALL IT. Called when a link is clicked. The implementation of this method is currently to simply call onClick(), but this may be augmented in the future.

Specified by:

onRequest in interface IRequestListener

setAnchor

public Link<T> setAnchor(Component anchor)

Sets an anchor component. An anchor (form 'http://server/app/etc#someAnchor') will be appended to the link so that after this link executes, it will jump to the provided anchor component's position. The provided anchor must either have the Component.getOutputMarkupId() flag true, or it must be attached to a <a tag with a href attribute of more than one character starting with '#' ('<a href="#someAnchor" ... ').

Parameters:

anchor - The anchor

Returns:

this

setAutoEnable

public final Link<T> setAutoEnable(boolean autoEnable)

Sets whether this link should automatically enable/disable based on current page.

Parameters:

autoEnable - whether this link should automatically enable/disable based on current page.

Returns:

This

setPopupSettings

public final Link<T> setPopupSettings(PopupSettings popupSettings)

Sets the popup specification. If not-null, a javascript on-click event handler will be generated that opens a new window using the popup properties.

Parameters:

popupSettings - the popup specification.

Returns:

This

appendAnchor

protected CharSequence appendAnchor(ComponentTag tag,
                                    CharSequence url)

Appends any anchor to the url if the url is not null and the url does not already contain an anchor (url.indexOf('#') != -1). This implementation looks whether an anchor component was set, and if so, it will append the markup id of that component. That markup id is gotten by either calling Component.getMarkupId() if Component.getOutputMarkupId() returns true, or if the anchor component does not output it's id, this method will try to retrieve the id from the markup directly. If neither is found, an exception is thrown. If no anchor component was set, but the link component is attached to a <a element, this method will append what is in the href attribute if there is one, starts with a '#' and has more than one character.

You can override this method, but it means that you have to take care of whatever is done with any set anchor component yourself. You also have to manually append the '#' at the right place.

Parameters:

tag - The component tag

url - The url to start with

Returns:

The url, possibly with an anchor appended

getOnClickScript

protected CharSequence getOnClickScript(CharSequence url)

Parameters:

url - The url for the link

Returns:

Any onClick JavaScript that should be used

getURL

protected CharSequence getURL()

Gets the url to use for this link.

Returns:

The URL that this link links to

linksTo

protected boolean linksTo(Page page)

Whether this link refers to the given page.

Parameters:

page - A page

Returns:

True if this link goes to the given page

onComponentTag

protected void onComponentTag(ComponentTag tag)

Handles this link's tag. OVERRIDES MUST CALL SUPER.

Overrides:

onComponentTag in class Component

Parameters:

tag - the component tag

See Also:

Component.onComponentTag(ComponentTag)