我有一个PrimeFaces p:dataTable,并通过实现LazyDataModel启用了延迟加载。

dataTable保存搜索结果,因此在执行搜索请求时,搜索服务仅检索所需的(分页)数据。很好

当使用p:commandButton进行ajax请求时:

<p:commandButton id="searchCmdBtn" value="Search" action="#{searchBean.search}"
   update=":resultForm:resultList :filterForm:filterMenu :resultForm:messages"
   ajax="true" />

dataTable会正确更新,但filterForm中的filterMenu不会正确更新(不同形式,使用p:layout bcz)。

filterMenu是后面的一个请求。这意味着当我再次按下搜索按钮时,filterMenu会用t更新,只有在第二个ajax请求之后才更新

Bean
@ManagedBean
@ViewScoped
public class SearchBean implements Serializable {

    private LazyDataModel<Entity> lazyDataModel;
    private MenuModel filterMenuModel = new DefaultMenuModel();
    private SearchResult searchResult = null;

    public void search() {
        // lazy call
        getLazyDataModel();
        if (searchResult != null) {
            buildFilterMenu(searchResult);
        }
    }

    private void initializeDataModel() {

        lazyDataModel = new LazyDataModel<Entity>() {

            private static final long serialVersionUID = 1L;

            @Override
            public List<Entity> load(int first, int pageSize, List<SortMeta> multiSortMeta, Map<String, String> filters) {

                // handling sorting and filtering

                // get search results
                try {
                    setSearchResult(searchService.getEntities(queryText, selectedQueryOperand, getFilterOptions(), first, (first + pageSize), multiSortMeta));
                } catch (Exception e) {
                    // handle exception
                }
                if (searchResult == null) {
                    return null;
                }
                List<Entity> resultEntities = searchResult.getResultEntities();
                // total count
                this.setRowCount((int) searchResult.getTotalSize());
                return resultEntities;
            }

        // other override-methods
        };
    }

    public void buildFilterMenu() {
        // builds the filterMenu depending on searchResults
    }


    // getters and setters

    public LazyDataModel<Entity> getLazyDataModel() {
        if (lazyDataModel == null) {
            initializeDataModel();
        }
        return lazyDataModel;
    }

}

filters.xhtml
<ui:composition xmlns="http://www.w3.org/1999/xhtml"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:p="http://primefaces.org/ui"
    xmlns:fn="http://java.sun.com/jsp/jstl/functions">

    <p:panelMenu id="filterMenu" model="#{searchBean.filterMenuModel}" />

</ui:composition>

最佳答案

在搜索PF论坛后,我找到了根本原因:

在渲染响应阶段调用dataTable Lazy load()方法

要了解阶段,请阅读this tutorial on JSF lifecycle from BalusC

显示消息的解决方案(例如p:messagesp:growl):

  • Update message component with PrimeFaces RequestContext
    RequestContext.getCurrentInstance().update(":growlOrMsgID");
    

    这将不起作用,因为当时添加其他组件进行更新为时已晚。

  • use dataTable attribute errorMessage

    找不到与此名称对应的dataTable
  • 属性
  • Put the p:messages or p:growl below the p:dataTable

    为我工作
  • Use PF execute method of RequestContext

    当前的ajax请求完成后,RequestContext#execute()执行一个javascript。

    为我工作


  • 另请参见:
  • Request update of component with ajax from LazyDataModel.load?
  • How to handle error in Primefaces lazy load?
  • PF Issue: DataTable with LazyDataModel updates model during render
  • http://itaffinity.wordpress.com/2013/06/08/jsf-displaying-facesmessages-during-render-response-phase/
  • 09-30 18:42
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