Question

enter image description here 我正在修复已经开发的应用程序中的错误，我是jsp的新手。所以我不知道这个问题。

这是.jsp文件中的代码

<tr:panelGroupLayout  partialTriggers="deleteFeaturePointId updateFP  OnsearchFeatures onClearFields">

<tr:panelBox contentStyle="overflow:auto;width:950px;height:200px;color:#FFFFFF;" >
<tr:treeTable emptyText="No Record Found"  value="#{featurePointBean.model}" 
styleClass="grid_hdg_txt" var="foo" 
inlineStyle="text-align:left;" expandAllEnabled="false" 
initiallyExpanded="true"  binding="#{featurePointBean.featurePointTableId}" 
rowBandingInterval="1"  width="100%" rootNodeRendered="false" 
verticalGridVisible="false"
partialTriggers="updateFP OnsearchFeatures onClearFields" 
autoSubmit="true" immediate="true" >

但问题是当表组件处于null时，它应该显示“No records found”消息。但它没有展示任何这样的东西并给出一张空桌子。那么我无法理解的问题是什么呢。有什么建议可以做什么？

输出就像屏幕下方

Answer 1

问题在于，后台中的表不是空的，因为在其各自的bean类中，一个空的DTO被添加到treetable中。它只需要进行空检查以避免将这个空DTO添加到树表中。这就是我改变代码的方式，并且运行良好。

            imageGroupNameDropList = featurePointDAO.getAvailableImageGroups(installId);
                        if(imageGroupNameDropList.size()!=0)
                        {   
                        availableFeaturePoints = featurePointDAO.searchFeaturePoints("",
                                "", getUserId(), getInstallId());
                        TreeNodeBean imageGroups = _createNode("Image Group Names");
                        root.add(0, imageGroups);
                        ArrayList<TreeNodeBean> featurePointNodes = new ArrayList<TreeNodeBean>();
                        ArrayList<TreeNodeBean> imageGroupNodes = new ArrayList<TreeNodeBean>()...
        >
        >
        >...
    for (FeaturePointDTO featurePointDTO : entry.getValue()) {
                        TreeNodeBean featurePoints = _createNode(
                                featurePointDTO.getImageGroupName(),
                                featurePointDTO);
                        featurePointNodes.add(featurePoints);
                    }
                    imageGroupName.setChildren(featurePointNodes);
}

为什么trinidad TreeTable为空文本不打印短信？

1 个答案: