[英]How can i make a tree when onclick with jsf primefaces
我想用jsf primefaces制作一棵樹。我想要的是當我擴展treenode時我想使用treeNode及其所有參數(我需要id來查詢)。因為我希望它在我擴展treenode時能工作當我單擊到treenode時,我將對數據庫進行查詢並帶來數據。這怎么可能?
// for example:
Fider fider=new Fider();
//i dont know how i can take selected treenode's object(fiderUtil)'s id
fider.setId(selectedfiderId);//?
List<Fider> fiders=fiderrepo.find(fider);
for(Fider fider:fiders )
TreeNode treeNode=new DefaultTreeNode(new FiderUtil(fider.name(), fider.id()),selectedTreeNode);
return treeNode;
您可以使用ajax expand事件:
在您的JSF頁面中:
<p:tree id="tree" value="#{yourManagedBean.root}" var="node">
<p:ajax event="expand" listener="#{yourManagedBean.onNodeExpand}" />
<p:treeNode>
<h:outputText value="#{node.label}">
</p:treeNode>
</p:tree>
在您的托管bean中:
@ManagedBean
@ViewScoped
public class YourManagedBean {
private TreeNode root;
public YourManagedBean() {
}
@PostConstruct
public void init() {
root = loadTreeData(); // Fill your Tree with data
}
public void setRoot(TreeNode root) {
this.root = root;
}
public TreeNode getRoot() {
return root;
}
public void onNodeExpand(NodeExpandEvent event) {
YourObject object = (YourObject) event.getTreeNode().getData();
//Now make your database query
}
}
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