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嗨我有一个jsf datatabel使用视图范围，它允许排序和分页。 我的问题是，我的BackingBean排序方法总是被调用两次，如果不在同一行排序时升序/降序排序（这会使其过时），那么这将不是一个大问题。 任何想法如何解决这个问题？我已经阅读了几个关于这个问题的方块，但是没有帮我在我的情况下... 我也试图改变它来请求范围，但这只是使我的分页消失...JSF方法总是被调用两次
这是BackingBean Methode它是只从我的facelet链接叫：
/**
* Changing sorting of list of events by columns.
*
* @param event
* ActionListener for the sorting field.
*/
public void sort(String sortingAttribute) {
System.out.println("you called sort: " + ++x);
if (sortField.equalsIgnoreCase(sortingAttribute)) {
boolean sortAscHelp = (sortAsc) ? false : true;
sortAsc = sortAscHelp;
} else {
sortField = sortingAttribute;
}
try {
events = (eventListType.equalsIgnoreCase("search")) ?EventManager.getSearchResults(searchTitle, searchDate, searchLocation, sortField, sortAsc, offset, limit) : EventManager.getEventList(eventListType, offset, limit, sortField, sortAsc);
} catch (DatabaseException e) {
FacesContext fcxt = FacesContext.getCurrentInstance();
fcxt.addMessage(component.getClientId(),
new FacesMessage(e.toString()));
logger.error("Error while loading the sorted list of searched events.");
}
}
这里来我的facelet：
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html">
<ui:composition template="../../templates/basicTemplate.xhtml">
<ui:define name="metadata">
<f:metadata>
<f:viewParam name="title" value="#{listEventsBean.searchTitle}"/>
<f:viewParam name="location" value="#{listEventsBean.searchLocation}"/>
<f:viewParam name="date" value="#{listEventsBean.searchDate}"/>
<f:viewParam name="eventListType" value="#{listEventsBean.eventListType}"/>
<f:viewParam name="page" value="#{listEventsBean.page}"/>
<f:viewParam name="sorting" value="#{listEventsBean.sortField}"/>
<f:viewAction action="#{listEventsBean.init}"/>
</f:metadata>
</ui:define>
<ui:define name="content">
<h:form>
<p style="color:#808080; font-weight:bold; font-size:large">#{msgs.listEvents_events}</p>
<br/>
<h:outputText style="color:green" value="#{msgs.listEvents_deleted}" rendered="#{listEventsBean.deleted}"/>
<h:dataTable id="eventTable" value="#{listEventsBean.getEvents()}" var="event" binding="#{listEventsBean.component}">
<h:column>
<f:facet name="header">
<h:commandLink value="#{msgs.listEvents_title}" action="#{listEventsBean.sort('title')}">
<f:attribute name="sortField" value="title"/>
</h:commandLink>
</f:facet>
<h:outputText value="#{event.title}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:commandLink value="#{msgs.listEvents_dateStart}" action="#{listEventsBean.sort('startofevent')}">
<f:attribute name="sortField" value="startOfEvent"/>
</h:commandLink>
</f:facet>
<h:outputText value="#{event.startOfEvent}">
<f:convertDateTime pattern="#{msgs.longDate}"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:commandLink value="#{msgs.listEvents_dateEnd}" action="#{listEventsBean.sort('endofevent')}">
<f:attribute name="sortField" value="endOfEvent"/>
</h:commandLink>
</f:facet>
<h:outputText value="#{event.endOfEvent}">
<f:convertDateTime pattern="#{msgs.longDate}"/>
</h:outputText>
</h:column>
<h:column>
<f:facet name="header">
<h:commandLink value="#{msgs.listEvents_price}" action="#{listEventsBean.sort('ticketprice')}">
</h:commandLink>
</f:facet>
<h:outputText value="#{event.ticketPrice}"/>
</h:column>
<h:column>
<f:facet name="header">
<h:outputText value="#{msgs.listEvents_action}"/>
</f:facet>
<h:button id="showDetails" value="#{msgs.listEvents_showDetails}"
outcome="showEvent">
<f:param name="eventID" value="#{event.eventID}"/>
</h:button>
<h:commandButton id="deleteEvent" value="#{msgs.listEvents_delete}"
action="#{listEventsBean.deleteEvent(event.eventID)}"
rendered="#{sessionBean.ld.systemAdmin}"
onclick="return confirm('#{msgs.listEvents_deleteMsg}')"/>
</h:column>
</h:dataTable>
<h:outputText style="color:blue" value="#{msgs.listEvents_emptyResult}" rendered="#{listEventsBean.notEmpty}"/>
<br />
<h:outputLink id="backToSearchLink" value="#{request.contextPath}/facelets/allUsers/searchEvents.xhtml" rendered="#{listEventsBean.notEmpty}">
<h:outputText value="#{msgs.listEvents_searchAgain}"/>
</h:outputLink>
<ui:repeat id="paginationEvent" var="p" value="#{listEventsBean.getPageNumbers()}">
<h:outputLink value="#{request.contextPath}/facelets/allUsers/listEvents.xhtml">
<h:outputText value="#{p.toString()}" />
<f:param name="page" value="#{p.toString()}" />
<f:param name="sorting" value="#{listEventsBean.sortField}"/>
<f:param name="eventListType" value="#{listEventsBean.eventListType}" />
</h:outputLink>
</ui:repeat>
</h:form>
</ui:define>
</ui:composition>
</ui:composition>