TreeGrid - simple example to work

[fargo]

Hi,

I am just trying to make a treegrid work with local dummy data and then later on to make it work with GWT-RPC. But my first try with local data fails, can someone please point me out why?

Here is the code to make the tree

        final TreeGrid dbTree = new TreeGrid();
        dbTree.setLoadDataOnDemand(false);          
        dbTree.setWidth(200);
        dbTree.setHeight100 ();
        
        dbTree.setAutoFetchData(false);  
        dbTree.setShowConnectors(true);         
        dbTree.setShowOpenIcons(false);
        dbTree.setShowDropIcons(false);
        dbTree.setClosedIconSuffix("");
        TreeGridField field = new TreeGridField("Name", "DB Control");  
        field.setCanSort(false);  

        dbTree.setFields(field);
        
        final Tree tree = new Tree();  
        tree.setModelType(TreeModelType.PARENT);  
        tree.setNameProperty("Name");  
        tree.setIdField("NodeId");  
        tree.setParentIdField("ParentNodeId");  
        tree.setShowRoot(true);  
  
        DBControlTreeNode root = new DBControlTreeNode ("1", "1", "TABLE");  
        DBControlTreeNode node2 = new DBControlTreeNode ("2", "1", "TABLE-1");  
        DBControlTreeNode node3 = new DBControlTreeNode ("3", "1", "TABLE-2");  
        DBControlTreeNode node4 = new DBControlTreeNode ("4", "1", "TABLE-3");  
        DBControlTreeNode node5 = new DBControlTreeNode ("5", "1", "TABLE-4");  
        tree.setData(new TreeNode[]{root, node2, node3, node4, node5});  
        
        dbTree.setData (tree);

Here is my own TreeNode

    public static class DBControlTreeNode extends TreeNode 
    {  
        
        public DBControlTreeNode(String objectId, String parentId, String name) {  
            setNodeId(objectId);  
            setParentNodeId(parentId);  
            setName(name);  
        }  
  
        public void setNodeId(String value) {  
            setAttribute("NodeId", value);  
        }  
  
        public void setParentNodeId (String value) {  
            setAttribute("ParentNodeId", value);  
        }  
  
        public void setName(String name) {  
            setAttribute("Name", name);  
        }  
    }

and here is the exception

Uncaught JavaScript exception [com.google.gwt.core.client.JavaScriptException: (TypeError): Object expected
 number: -2146823281
 description: Object expected
	at com.smartgwt.client.util.JSOHelper.setAttribute(Native Method)
	at com.smartgwt.client.core.BaseClass.getOrCreateJsObj(BaseClass.java:86)
	at com.smartgwt.client.widgets.tree.TreeGrid.setData(TreeGrid.java:183)

Any advice? What am i doing wrong here?

[fargo]

Solved

Hi,

I solved the problem by doing the following:

...
        tree.setRootValue ("root");
...

...  
        DBControlTreeNode root = new DBControlTreeNode ("1", "root", "TABLE");  
        DBControlTreeNode node2 = new DBControlTreeNode ("2", "1", "TABLE-1");  
        DBControlTreeNode node3 = new DBControlTreeNode ("3", "1", "TABLE-2");  
        DBControlTreeNode node4 = new DBControlTreeNode ("4", "1", "TABLE-3");  
        DBControlTreeNode node5 = new DBControlTreeNode ("5", "1", "TABLE-4");  
....

Setting the root value and assigning non-overlapping values to the node was the key.

Thx. Fargo.