Question

在http://www.primefaces.org/showcase-labs/ui/datatableRowSelectionRadioCheckbox.jsf的Primefaces数据表示例之后，我已经能够构建一个数据表，显示来自我的数据源的正确的标题和行数。但是，没有显示数据;它显示空白单元格。

调试后，我发现问题是由于我的DataModel中的以下代码部分：

@Override
public Resource getRowData(String rowKey) {
    List<Resource> resources = (List<Resource>) getWrappedData();

    for(Resource resource : resources) {
        if(resource.getResourceId().equals(rowKey))
            return resource;
    }
    return null;
}

if(resource.getResourceId().equals(rowKey))条件的计算结果为false，因此不返回Resource个对象。

我似乎无法看清我做错了什么。我bean的相关部分如下所示：

public class NewIncidentWizardBean implements Serializable {

private static final long serialVersionUID = 1L;

private static Logger logger =  Logger.getLogger(NewIncidentWizardBean.class.getName());

private static Resource[] tmpResources;

static {
    tmpResources = new Resource[12];

    tmpResources[0] = new Resource(new Long(1), ..., new Long(2));
    tmpResources[1] = new Resource(new Long(2), ..., new Long(4));
    tmpResources[2] = new Resource(new Long(3), ..., new Long(10));
    tmpResources[3] = new Resource(new Long(4), ..., new Long(10));
    tmpResources[4] = new Resource(new Long(5), ..., new Long(10));
    tmpResources[5] = new Resource(new Long(6), ..., new Long(10));
    tmpResources[6] = new Resource(new Long(7), ..., new Long(10));
    tmpResources[7] = new Resource(new Long(8), ..., new Long(10));
    tmpResources[8] = new Resource(new Long(9), ..., new Long(10));
    tmpResources[9] = new Resource(new Long(10), ..., new Long(10));
    tmpResources[10] = new Resource(new Long(11), ..., new Long(7));
    tmpResources[11] = new Resource(new Long(12), ..., new Long(90));
}

private List<Resource> resources;
private ResourceDataModel resourcesModel;
private Resource selectedResource;
private Resource[] selectedResources;

public NewIncidentWizardBean() {
    resources = new ArrayList<Resource>();
    for(int i = 0; i < tmpResources.length; i++)
        resources.add(tmpResources[i]);

    resourcesModel = new ResourceDataModel(resources);
}

public Resource getSelectedResource() {
    return selectedResource;
}

public void setSelectedResource(Resource selectedResource) {
    this.selectedResource = selectedResource;
}

public Resource[] getSelectedResources() {
    return selectedResources;
}

public void setSelectedResources(Resource[] selectedResources) {
    this.selectedResources = selectedResources;
}

public Resource getResource() {
    return resource;
}

public void setResource(Resource resource) {
    this.resource = resource;
}

public List<Resource> getResources() {
    return resources;
}

public void setResources(List<Resource> resources) {
    this.resources = resources;
}

public ResourceDataModel getResourcesModel() {
    return resourcesModel;
}
}

我认为相关部分是：

<p:dataTable id="resources" var="resource" value="#{newDisasterWizardBean.resourcesModel}" paginator="true" rows="10"  
             selection="#{newDisasterWizardBean.selectedResources}">  

    <p:column selectionMode="multiple" style="width:18px" />  

    <p:column headerText="Resource Name">  
        #{resource.name}  
    </p:column>  

    <p:column headerText="Description">  
        #{resource.description}  
    </p:column>  

    <p:column headerText="Resource Type" >  
        #{resource.type}  
    </p:column>  

    <p:column headerText="Units Required">  
        #{resource.units}  
    </p:column>  

</p:dataTable>

我无法发现我可能做错的事情。任何帮助将受到高度赞赏。提前谢谢。

Answer 1

你能留下你正在使用哪个PF版本的笔记吗？从3.3开始，数据表的延迟加载处理发生了变化。尝试用3.2然后你可以看看你的代码是否正常另外，我定义了rowKey标记。我想你应该定义它！要触发选择/取消选择，您还应该定义这些ajax事件：

    <p:dataTable id="myid"
        value="#{myvalue}" var="valuevar"
        selection="#{value.valueSelected}"
        rowKey="#{valuevar.onevalue}">
        <p:ajax event="rowSelect"
            process="@this"
            update="@this" />
        <p:ajax event="rowUnselect"
            process="@this"
            update="@this" />
                    ...................
    </p:dataTable>

我目前在3.3.1中使用PrimeFaces问题2993中提到的lazy = true参数。

希望有所帮助。

Primefaces Multiple Selection Datatable不显示数据

1 个答案: