2005/10/18, Sean Schofield <[EMAIL PROTECTED]>:
I tried myself the example and had the same problems.
I don't think ActionEvent.getComponent() would work, because in this case the component would be the commandbutton, not the tree. Am I missing something?
I had the same problem, and I solved it in a slightly different way, but I'm not really sure it is the "best practice";
taking as example the code posted before I modified the submitTree() method this way:
public void submitTree(ActionEvent e) {
TreeModelBase model = (TreeModelBase)tree.getValue();
this.handleSelected(model, "0");
}
I then added the handleSelected() method that makes recursion into the tree nodes starting from the root (id = "0"):
private void handleSelected(TreeModel model, String nodeId) {
//Set the current node id
model.setNodeId(nodeId);
TreeNode node = model.getNode();
if(node != null) {
//Build the checkox id by concatenating formId, tree id, nodeId and checkbox id...
String checkboxId = "formId:tree:" + nodeId + ":relation";
//Extract the checkbox parameter from the request
Object chk = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(checkboxId);
if(chk != null) {
//Checkbox selected!
}
//If the node isn't a leaf continue recursion
if(node.getChildCount() > 0) {
List children = node.getChildren();
if(children != null) {
Iterator it = children.iterator();
int i = -1;
while(it.hasNext()) {
i++;
//Creates the child node's id
String childNodeId = nodeId + ":" + i;
model.setNodeId(childNodeId);
TreeNode childNode = (TreeNode)it.next();
//Recursion
this.handleSelected(model, childNodeId);
}
}
}
}
}
As I said before, I'm not sure this is the correct way of doing this; my perplexity comes from the way I used to evaluate the actual checkbox id, i.e. concatenating the form id, the tree id, the current node id and the checkbox id.
Does someone have a better solution?
ennio
A few thoughts ...
I'm not sure the binding attribute on tree2 works properly although I
could be wrong since I haven't worked closely on it in a few months
now.
I don't think you need to have refs to the tree data, etc. in your
backing bean. Try using ActionEvent.getComponent() instead.
I tried myself the example and had the same problems.
I don't think ActionEvent.getComponent() would work, because in this case the component would be the commandbutton, not the tree. Am I missing something?
I had the same problem, and I solved it in a slightly different way, but I'm not really sure it is the "best practice";
taking as example the code posted before I modified the submitTree() method this way:
public void submitTree(ActionEvent e) {
TreeModelBase model = (TreeModelBase)tree.getValue();
this.handleSelected(model, "0");
}
I then added the handleSelected() method that makes recursion into the tree nodes starting from the root (id = "0"):
private void handleSelected(TreeModel model, String nodeId) {
//Set the current node id
model.setNodeId(nodeId);
TreeNode node = model.getNode();
if(node != null) {
//Build the checkox id by concatenating formId, tree id, nodeId and checkbox id...
String checkboxId = "formId:tree:" + nodeId + ":relation";
//Extract the checkbox parameter from the request
Object chk = FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get(checkboxId);
if(chk != null) {
//Checkbox selected!
}
//If the node isn't a leaf continue recursion
if(node.getChildCount() > 0) {
List children = node.getChildren();
if(children != null) {
Iterator it = children.iterator();
int i = -1;
while(it.hasNext()) {
i++;
//Creates the child node's id
String childNodeId = nodeId + ":" + i;
model.setNodeId(childNodeId);
TreeNode childNode = (TreeNode)it.next();
//Recursion
this.handleSelected(model, childNodeId);
}
}
}
}
}
As I said before, I'm not sure this is the correct way of doing this; my perplexity comes from the way I used to evaluate the actual checkbox id, i.e. concatenating the form id, the tree id, the current node id and the checkbox id.
Does someone have a better solution?
ennio
sean
On 10/12/05, Enrico Triolo <[EMAIL PROTECTED] > wrote:
> Hi all, I'm experimenting with the tree2 component, but I'm facing a problem: I
> added a checkbox for each node, trying to follow the same method I would use for
> a datatable. I then added a commandButton for submitting page data.
>
> The problem is, when the commandButton action is performed on the server side, I
> can't extract any node from the tree component.
>
> Here is the code:
>
> The backing bean:
>
> public class MyBean {
>
> private UITreeData tree = null;
> private UISelectBoolean checkbox = null;
>
> //Creates the TreeModel to feed the tree
> public TreeModel getTreeData() {
> TreeNode root = this.addNode(new MyTreeNode("0", "root"), 0);
> return new TreeModelBase(root);
> }
>
> //Adds some fake nodes to the tree
> private TreeNode addNode(MyTreeNode node, int level) {
>
> TreeNodeBase node1 = null;
>
> if(level == 0)
> node1 = new TreeNodeBase("root", node.getName(), node.getId(), false);
> else
> node1 = new TreeNodeBase("central-node", node.getName(),
> node.getId(), false);
>
> Vector children = new Vector();
>
> if(level < 3) {
> children.add ( new MyTreeNode(level + ".1", "node" + level + ".1") );
> children.add( new MyTreeNode(level + ".2", "node" + level + ".2") );
> children.add( new MyTreeNode(level + ".3", "node" + level + ".3") );
>
> for(int i = 0; i < children.size(); i++) {
> TreeNode child =
> this.addNode((MyTreeNode)children.elementAt(i), level + 1);
> node1.getChildren().add(child);
> }
> }
>
> return node1;
> }
>
> public UITreeData getTree() {
> return tree;
> }
>
> public void setTree(UITreeData tree) {
> this.tree = tree;
> }
>
> public UISelectBoolean getCheckbox() {
> return checkbox;
> }
>
> public void setCheckbox(UISelectBoolean checkbox) {
> this.checkbox = checkbox;
> }
>
> public void submitTree(ActionEvent e) {
>
> TreeNode root = this.tree.getNode();
>
> if(root != null) {
> ... // *** ROOT IS ALWAYS NULL. THIS BLOCK IS NEVER EXECUTED ***
> }
> }
> }
>
> MyTreeNode is a simple bean:
>
> class MyTreeNode {
>
> private String name;
> private String id;
>
> public MyTreeNode(String id, String name) {
> this.id = id;
> this.name = name;
> }
>
> public String getId() { return id; }
> public String getName() { return name; }
> public void setId(String id) { this.id = id; }
> public void setName(String name) { this.name = name; }
> }
>
> And here's the view:
>
> <[EMAIL PROTECTED] uri="http://java.sun.com/jsf/html" prefix="h"%>
> <[EMAIL PROTECTED] uri=" http://myfaces.apache.org/tomahawk" prefix="t"%>
> <[EMAIL PROTECTED] uri="http://java.sun.com/jsf/core" prefix="f"%>
>
> <f:view>
> <h:form>
> <t:tree2 binding="#{myBean.tree}"
> value="#{myBean.treeData}"
> var="node"
> varNodeToggler="t"
> clientSideToggle="false"
> showLines="true"
> showRootNode="true"
> preserveToggle="true"
> id="tree">
> <f:facet name="root">
> <h:panelGroup>
> <h:outputText value="<strong>root</strong>"
> styleClass="nodeFolder" escape="false"/>
> </h:panelGroup>
> </f:facet>
> <f:facet name="central-node">
> <h:panelGroup>
> <h:selectBooleanCheckbox id="relation"
> binding="#{myBean.checkbox}" />
> <h:commandLink immediate="true" action="">> <h:outputText value="<strong>#{node.description}</strong>"
> styleClass="nodeFolder" escape="false" />
> </h:commandLink>
> </h:panelGroup>
> </f:facet>
> </t:tree2>
>
> <h:commandButton value="do something" action="" />
>
> </h:form>
> </f:view>
>
>
> The problem is in the submitTree() method: in fact the root node is always null!
>
>
>
>
