Question

我有一个包含parentid列的数据库表，childid。我想创建一个使用primefaces树加载表数据的jsf树视图。给出的例子是静态数据。请有人帮帮忙。我很高兴。感谢。

Answer 1

XHTML

<h:form id="form">  

    <p:tree value="#{dynamicTreeBean.root}" var="node" dynamic="true" cache="true" id="tree">  
            <p:ajax event="expand" listener="#{dynamicTreeBean.onNodeExpand}" />  
        <p:treeNode>  
            <h:outputText value="#{node}"/>  
        </p:treeNode>  
    </p:tree>  

</h:form>

爪哇

import java.util.Random;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;

import org.primefaces.event.NodeExpandEvent;
import org.primefaces.model.DefaultTreeNode;
import org.primefaces.model.TreeNode;

@ManagedBean
@SessionScoped

public class DynamicTreeBean {  

    private TreeNode root;  

    public DynamicTreeBean() {  
        root = new DefaultTreeNode("Root", null);
        TreeNode dynamicTreeNode = new DefaultTreeNode("First", root);
      //<Add dummy node: This is to have + sign in node to be able to expand it in GUI>
        TreeNode node0 = new DefaultTreeNode("fake", dynamicTreeNode);
      //<Add dummy node>
    }  

    public TreeNode getRoot() {  
        return root;  
    }
    static Random random = new Random();
    public void onNodeExpand(NodeExpandEvent event) {  
        //<Remove dummy node>
        if(event.getTreeNode().getChildCount()==1){
            event.getTreeNode().getChildren().remove(0);
        }
        //</Remove dummy node>

        //<Generate some random children>
        int childrenCount = random.nextInt(9)+1;
        for(int i=0;i<childrenCount;i++){
            TreeNode tn = new DefaultTreeNode("-child-"+i, event.getTreeNode());

            //<Add dummy node>
            new DefaultTreeNode("fake", tn);
            //</Add dummy node>
        }
        //</Generate some random children>
    }
}

Answer 2

您可以通过创建扩展“ DefaultTreeNode ”的类来创建动态treenode，并覆盖DefaultTreeNode方法以满足您的需求并使用正确的数据。

然后通过实例化您的新类来创建自己的节点。

您只需在bean中提供根节点（使用其get方法）。

使用primefaces树加载数据库表

2 个答案: