本文介绍了排序在 PrimeFaces 的数据表中不起作用?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
排序在 PrimeFaces 的数据表中不起作用.请提出建议.
Sorting is not working in datatable in PrimeFaces. Please suggest.
见下面我的 .xhtml 文件
See below my .xhtml file
<h:form>
<p:dataTable style="width: 60%" id="dt1" value="#{bean.list}" var="entry" first="0" paginator="true" rows="10" paginatorTemplate="{CurrentPageReport} {FirstPageLink} {PreviousPageLink} {PageLinks} {NextPageLink} {LastPageLink} {RowsPerPageDropdown}" rowsPerPageTemplate="5,10,15" emptyMessage="No cars found with given criteria" >
<f:facet name="header">
<h2>Cars View</h2>
</f:facet>
<p:column sortBy="#{entry.carno}" filterBy="#{entry.carno}">
<f:facet name="header">
<h:outputText value="Car Number" />
</f:facet>
<h:outputText value="#{entry.carno}"></h:outputText>
</p:column>
<p:column sortBy="#{entry.carsettings['car-model']}" filterBy="#{entry.carsettings['car-model']}">
<f:facet name="header">
<h:outputText value="Car Model"/>
</f:facet>
<h:outputText value="#{entry.carsettings['car-model']}"></h:outputText>
</p:column>
<p:column sortBy="#{entry.carsettings.year}" filterBy="#{entry.carsettings.year}">
<f:facet name="header">
<h:outputText value="Car Year"/>
</f:facet>
<h:outputText value="#{entry.carsettings.year}"></h:outputText>
</p:column>
<p:column sortBy="#{entry.carsettings.color}" filterBy="#{entry.carsettings.color}">
<f:facet name="header">
<h:outputText value="Car Color"/>
</f:facet>
<h:outputText value="#{entry.carsettings.color}"></h:outputText>
</p:column>
</p:dataTable>
</h:form>
@肖恩
看下面的代码
汽车清单
<ui:composition template="/template.xhtml">
<ui:define name="content">
<f:view>
<f:event type="preRenderView" listener="#{MyBackingBean.load}"></f:event>
<center>
<h1>Car View</h1>
<h:outputText value="No data found" style="font-size: 15px;font-family: Arial, Verdana,Helvetica, sans-serif" rendered="#{MyBackingBean.noDataExist}"></h:outputText>
<h:form id="dataform1">
<p:dataTable var="item" value="#{MyBackingBean.dataList}" dynamic="true" paginator="true" rows="2" id="table" style="width:60%"
rendered="#{!MyBackingBean.noDataExist}" >
<p:column sortBy="#{item.id}" filterBy="#{item.id}">
<f:facet name="header">
<h:outputText value="ID" />
</f:facet>
<h:outputText value="#{item.id}" />
</p:column>
<p:column sortBy="#{item.carsettings['car-color']}" filterBy="#{item.carsettings['car-color']}">
<f:facet name="header">
<h:outputText value="Color" />
</f:facet>
<h:outputLink target="_blank" value="http://#{item.carsettings['car-color']}">
<h:outputText value="#{item.carsettings['car-color']}" />
</h:outputLink>
</p:column>
<p:column sortBy="#{item.carsettings.model}" filterBy="#{item.carsettings.model}">
<f:facet name="header">
<h:outputText value="Model" />
</f:facet>
<h:outputText value="#{item.carsettings.model}" />
</p:column>
<p:column sortBy="#{item.carsettings.manufacturer}" filterBy="#{item.carsettings.manufacturer}">
<f:facet name="header">
<h:outputText value="Manufacturer" />
</f:facet>
<h:outputText value="#{item.carsettings.manufacturer}" />
</p:column>
</p:dataTable>
</h:form>
</center>
</f:view>
</ui:define>
</ui:composition>
</h:body>
排序在上面的代码中不起作用
Sorting is not working in the above code
请帮忙
推荐答案
primefaces 支持 bean (ViewScoped!) 必须拥有它自己的行列表.因此，例如，如果每次请求 p:dataTable:value 时都查询数据库，则排序将不起作用.
The primefaces backing bean (ViewScoped!) must hold it's own List of rows. So, e.g., if you query the database every time you request the p:dataTable:value, sorting will not work.
解决方案:从数据库中收集列表并将其保存在支持 bean 的本地列表变量中.
Solution: Collect the List from the Database and keep it in a local List variable in the backing bean.
public List<Row> getDataTable() {
if (tableDataList == null)
tableDataList = loadListOnce();
return tableDataList;
}
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