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RichFaces中使用datatable和datascroller进行分页(JSF 1.2,RichFaces 3.2.1GA)
jsp页面中的相关代码：
    <f:view>
        <h:form>
            <rich:dataTable id="carList" width="483" rows="10" columnClasses="col"
                value="#{user.allCars}" var="car">
                <f:facet name="header">
                    <rich:columnGroup>
                        <h:column>
                            <h:outputText styleClass="headerText" value="Name" />
                        </h:column>
                        <h:column>
                            <h:outputText styleClass="headerText" value="Decription" />
                        </h:column>
                        <h:column>
                            <h:outputText styleClass="headerText" value="Base Price" />
                        </h:column>
                        <h:column>
                            <h:outputText styleClass="headerText" value="Time" />
                        </h:column>
                        <h:column>
                            <h:outputText styleClass="headerText" value="操作操作" />
                        </h:column>                        
                    </rich:columnGroup>
                </f:facet>
    
                <h:column>
                    <h:outputText value="#{car.name}" />
                </h:column>
                <h:column>
                    <h:outputText value="#{car.description}" />
                </h:column>
                <h:column>
                    <h:outputText value="#{car.baseprice}" />
                </h:column>
                <h:column>
                    <h:outputText value="#{car.timestamp}" />
                </h:column>
                <h:column>
                    <h:commandLink action="#{user.delete}" value="删除" >
                        <f:param name="id" value="#{car.id}"/>
                    </h:commandLink>
                </h:column>                
            </rich:dataTable>
            <rich:datascroller for="carList" id="dc1" 
            style="width:483px" page="#{user.scrollerPage}"/>                        
        </h:form>
    </f:view>
后台User类的代码：
public class User
{

    private int scrollerPage = 1;
    
    private List<CarBean> allCars; 
    
    public User()
    {

    }
    
    public int getScrollerPage()
    {
        return scrollerPage;
    }

    public void setScrollerPage(int scrollerPage)
    {
        this.scrollerPage = scrollerPage;
        System.out.println("current page = " + scrollerPage);
    }

    public List<CarBean> getAllCars()
    {
        CarBeanDAO dao = new CarBeanDAO();
        Query q = EntityManagerHelper.createQuery("from CarBean cars order by cars.id desc");

        return q.getResultList();
    }
    
    public void setAllCars(List<CarBean> allCars)
    {
        this.allCars = allCars;
    }
    
    public String delete()
    {
        FacesContext ctx = FacesContext.getCurrentInstance();
        int id = Integer.parseInt(ctx.getExternalContext().getRequestParameterMap().get("id"));
        EntityManagerHelper.beginTransaction();
        CarBeanDAO dao = new CarBeanDAO();
        CarBean bean = dao.findById(id);
        if(bean != null)
            dao.delete(bean);
        EntityManagerHelper.commit();
        return null;
    }
}
datatable+datascroller使用的是伪分页的方式，也就是说在数据库层那并没有分页，只是程序一次读出所有数据然后进行程序分页操作，这样适合数据量不太大的分页操作，数据量过大的话就需要自己写数据模型进行操作了。本分页代码加入了删除记录的功能，delete结果返回null会使删除操作完成后返回当前页面，这样就会发现刚才被删除数据消失了，后面数据都上来一条。
posted on 2008-11-23 00:43 Vincent-chen 阅读(350) 评论(0)  编辑  收藏 所属分类: richfaces

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