在我的应用程序中,我需要渲染一棵树,其中数据以层次结构存在,并且该树包含多选复选框。到目前为止,代码运行良好,但是出现了一个新的用例,其中需要呈现大量数据。我已经检查了客户端和服务器端消耗的时间。服务器端代码花费的时间不到一秒钟,但是客户端无法渲染树,并且服务器发送响应后浏览器便停止工作。我也尝试过使用TreeTable组件,但是面临相同的问题。我认为问题是由于服务器一口气发送了完整的数据,而与存储值的层次结构无关。所需的初始视图是,在扩展特定数据元素时,仅应显示顶层数据,并且层次结构中的下一层数据需要显示。客户端是否可能只应该在第一个匹配中获取顶级数据,并且每当用户扩展任何级别时,都应该仅针对该特定父数据获取下一个数据。
primefaces是否还有其他可以解决此问题的组件?
<p:dialog widgetVar="treeModal" header="Parameter's Values"
styleClass="ui-dialog-small-mid" resizable="false" modal="true">
<p:messages id="myMessagePopup" autoUpdate="true" closable="true"
escape="false" />
<h:form id="treeModalForm">
<div class="ui-dialog-inner parameter_dialog dialog-h400">
<p:tree value="#{bean.dailogGroupInfo.genericUnitTree}"
var="node"
rendered="#{bean.dailogGroupInfo.genericTreeRendered}"
selectionMode="checkbox"
selection="#{bean.dailogGroupInfo.selectedGenericUnitNodes}"
paginator="true" rows="5">
<p:treeNode>
<h:outputText value="#{node.valueName}" />
</p:treeNode>
</p:tree>
</div>
<div class="button_row">
<p:commandButton styleClass="btn btn-primary" value="Add"
id="addButton"
action="#{action.addValuesToGenericTree}">
</p:commandButton>
<p:commandButton styleClass="btn" value="Cancel"
onclick="scrollUp();" id="cancelButton"
oncomplete="PF('treeModal').hide()" required="true" />
</div>
</h:form>
</p:dialog>
Java代码:
List<parameterTO> parameterTOList = bean.getParameterTOlist();
List<Info> infoTOlist = new ArrayList<Info>();
for (parameterTO gpTO : parameterTOList) {
Info info = new Info();
ParamInitTO paramInitTO = new ParamInitTO();
paramInitTO.setParameterTO(gpTO);
serviceRequest.setRequestTO(paramInitTO);
serviceResponse = facadeRemote.getIntialParamForOrg(serviceRequest);
genericUnitTOList = (List<GenericUnitTO>) serviceResponse.getResponseTOList();
info.setParameterTO(gpTO);
TreeNode genericUnitTree = null;
if (gpTO.getEntityNameParentLabel() != null) {
Map<Integer, List<GenericUnitTO>> genericUnitMap = Helper
.converGenericUnitTOIntoMap(genericUnitTOList);
genericUnitTree = Helper.convertIntoGenericUnitTree(genericUnitMap, info);
} else {
genericUnitTree = Helper.convertIntoGenericUnitTree(genericUnitTOList, info);
}
info.setGenericUnitTree(genericUnitTree);
infoTOlist.add(groupInfo);
}
bean.setInfolist(infoTOlist);
TreeNode[] selectedGenericNodes = infoTOlist.getSelectedGenericUnitNodes();
List<valueTO> genericUnitShowList = infoTOlist.getGenricUnitShowList();
selectedGenericNodes = helper.getActualselectedNodes(selectedGenericNodes, genericUnitShowList);
infoTOlist.setSelectedGenericUnitNodes(selectedGenericNodes);
if (selectedGenericNodes != null) {
helper.SetNodeChecked(infoTOlist.getGenericUnitTree(), infoTOlist.getSelectedGenericUnitNodes());
}
bean.setDailogInfo(infoTOlist);
答案 0 :(得分:4)
您可以实现延迟加载子节点,以减少加载的数据量:
<p:ajax event="expand" process="@this" listener="#{controller.onNodeExpand}" />
public void onNodeExpand(NodeExpandEvent event)
{
TreeNode node = event.getTreeNode();
node.getChildren().clear();
node.getChildren().add(new ....);
}