This documentation is for an old version of fiftyfive-wicket (2.0.9).


fiftyfive.wicket.list
Class ConditionalListView<T>

java.lang.Object
  extended by org.apache.wicket.Component
      extended by org.apache.wicket.MarkupContainer
          extended by org.apache.wicket.markup.html.WebMarkupContainer
              extended by org.apache.wicket.markup.repeater.AbstractRepeater
                  extended by org.apache.wicket.markup.html.list.ListView<T>
                      extended by fiftyfive.wicket.list.ConditionalListView<T>
All Implemented Interfaces:
Serializable, IClusterable, IConverterLocator

public abstract class ConditionalListView<T>
extends ListView<T>

A ListView that returns false for isVisible() if its list is empty. This allows you to use the <wicket:enclosure> tag to hide surrounding markup. Therefore you can use this component to ensure that, for example, the <ul> is ommitted when you have zero <li> elements. This is necessary for valid XHTML markup.

Example usage:

 <wicket:enclosure child="item">
   <ul>
     <li wicket:id="item">...</li>
   </ul>
 </wicket:enclosure>

 add(new ConditionalListView<Person>("people", personList) {
     @Override protected void populateItem(ListItem<Person> item)
     {
         item.add(...);
     }
 });

In this example, if the personList model is null or empty, the entire enclosure will be omitted from the HTML output.

See Also:
Serialized Form

Nested Class Summary
 
Nested classes/interfaces inherited from class org.apache.wicket.Component
Component.ComponentModelChange, Component.EnabledChange, Component.IVisitor<T extends Component>, Component.VisibilityChange
 
Field Summary
 
Fields inherited from class org.apache.wicket.Component
ENABLE, FLAG_CONFIGURED, FLAG_INITIALIZED, FLAG_REMOVING_FROM_HIERARCHY, FLAG_RESERVED1, FLAG_RESERVED2, FLAG_RESERVED3, FLAG_RESERVED4, FLAG_RESERVED5, FLAG_RESERVED6, FLAG_RESERVED7, FLAG_RESERVED8, PARENT_PATH, PATH_SEPARATOR, RENDER
 
Constructor Summary
ConditionalListView(String id)
           
ConditionalListView(String id, IModel<? extends List<? extends T>> model)
           
ConditionalListView(String id, List<? extends T> list)
           
 
Method Summary
 boolean isVisible()
          Returns false if the list is empty.
 
Methods inherited from class org.apache.wicket.markup.html.list.ListView
getList, getListItemModel, getModel, getModelObject, getReuseItems, getStartIndex, getViewSize, iterator, moveDownLink, moveUpLink, newItem, onBeginPopulateItem, onPopulate, populateItem, removeLink, renderChild, renderItem, renderIterator, setList, setModel, setModelObject, setReuseItems, setStartIndex, setViewSize
 
Methods inherited from class org.apache.wicket.markup.repeater.AbstractRepeater
onBeforeRender, onRender
 
Methods inherited from class org.apache.wicket.markup.html.WebMarkupContainer
getMarkupType, getWebPage, getWebRequest
 
Methods inherited from class org.apache.wicket.MarkupContainer
add, addOrReplace, autoAdd, autoAdd, contains, findMarkupStream, get, get, getAssociatedMarkupStream, getMarkupStream, hasAssociatedMarkup, internalAdd, isTransparentResolver, iterator, newMarkupResourceStream, onAfterRenderChildren, onComponentTagBody, remove, remove, removeAll, renderAll, renderAssociatedMarkup, renderComponentTagBody, renderNext, replace, setDefaultModel, setMarkupStream, size, swap, toString, toString, visitChildren, visitChildren
 
Methods inherited from class org.apache.wicket.Component
add, addStateChange, afterRender, beforeRender, callOnBeforeRenderIfNotVisible, checkComponentTag, checkComponentTagAttribute, checkHierarchyChange, configure, continueToOriginalDestination, debug, detach, detachBehaviors, detachModel, detachModels, determineVisibility, error, exceptionMessage, fatal, findPage, findParent, findParentWithAssociatedMarkup, getAjaxRegionMarkupId, getApplication, getBehaviors, getBehaviors, getBehaviorsRawList, getClassRelativePath, getComponentBorder, getConverter, getConverter, getDefaultModel, getDefaultModelObject, getDefaultModelObjectAsString, getDefaultModelObjectAsString, getEscapeModelStrings, getFeedbackMessage, getFlag, getFlag, getId, getInnermostModel, getInnermostModel, getLocale, getLocalizer, getMarkupAttributes, getMarkupId, getMarkupId, getMarkupIdImpl, getMetaData, getModelComparator, getOutputMarkupId, getOutputMarkupPlaceholderTag, getPage, getPageRelativePath, getParent, getPath, getRenderBodyOnly, getRequest, getRequestCycle, getResponse, getSession, getSizeInBytes, getStatelessHint, getString, getString, getString, getStyle, getVariation, hasBeenRendered, hasErrorMessage, hasFeedbackMessage, info, initModel, internalAttach, internalDetach, internalOnAttach, internalOnDetach, internalOnModelChanged, isActionAuthorized, isAncestorOf, isAttached, isBehaviorAccepted, isEnableAllowed, isEnabled, isEnabledInHierarchy, isIgnoreAttributeModifier, isRenderAllowed, isStateless, isVersioned, isVisibilityAllowed, isVisibleInHierarchy, locateMarkupStream, markAttached, markRendering, modelChanged, modelChanging, onAfterRender, onAttach, onBeginRequest, onComponentTag, onConfigure, onDetach, onEndRequest, onInitialize, onModelChanged, onModelChanging, onRemove, prepareForRender, prepareForRender, redirectToInterceptPage, remove, remove, render, render, renderComponent, renderComponent, renderComponentTag, rendered, renderHead, renderPlaceholderTag, replaceComponentTagBody, replaceWith, sameInnermostModel, sameInnermostModel, setAuto, setComponentBorder, setDefaultModelObject, setEnabled, setEscapeModelStrings, setFlag, setFlag, setIgnoreAttributeModifier, setMarkupId, setMarkupIdImpl, setMetaData, setOutputMarkupId, setOutputMarkupPlaceholderTag, setRedirect, setRenderBodyOnly, setResponsePage, setResponsePage, setResponsePage, setVersioned, setVisibilityAllowed, setVisible, urlFor, urlFor, urlFor, urlFor, urlFor, urlFor, visitParents, warn, wrap
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Constructor Detail

ConditionalListView

public ConditionalListView(String id)

ConditionalListView

public ConditionalListView(String id,
                           IModel<? extends List<? extends T>> model)

ConditionalListView

public ConditionalListView(String id,
                           List<? extends T> list)
Method Detail

isVisible

public boolean isVisible()
Returns false if the list is empty.

Overrides:
isVisible in class Component


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