dynamically select a checkbox for siblings treenode in Smart GWT - gwt

Question

I have a selectable Tree with checkbox appearance. I need to select all sibling TreeNode on selection of a specific TreeNode.
I could get all the sibling tree nodes, but I don't know what is the attribute name of TreeNode to make that checkbox selected.
Can anybody help me giving some way to select those nodes.
compareGrid.addSelectionChangedHandler(new SelectionChangedHandler() {
#Override
public void onSelectionChanged(SelectionEvent event) {
TreeNode node = (TreeNode) event.getSelectedRecord();
TreeNode parent = tree.getParent(node);//tree is Tree object
treeGrid.selectRecord(parent);
TreeNode[] nodes = tree.getAllNodes(parent);
for(int i=0; i< nodes.length; i++){
if(!nodes[i].getAttributeAsBoolean("isSelected"))
treeGrid.selectRecord(nodes[i]);
}
}
}
});

Answer 1

You can use any of the following:
treeGrid.selectAllRecords();
treeGrid.selectRecord(record);
treeGrid.selectRecords(records);
The first method will select all the TreeNodes of the tree.
The 2nd one will select only one specified TreeNodes of the tree.
And the 3rd one will select multiple specified TreeNodes of the tree.
There are multiple overloaded methods for the last 2 methods, which allows you to specify Nodes in terms of, TreeNode(s) itself, or index of the TreeNode(s).

Answer 2

Here's a solution quite close (without checkboxes) to what you need.
employeeTreeGrid.addNodeClickHandler(new NodeClickHandler() {
public void onNodeClick(NodeClickEvent event) {
if (event.getNode() != null) {
TreeNode node = event.getNode();
TreeNode parent = employeeTree.getParent(node);
if (employeeTreeGrid.isSelected(node)) {
List<TreeNode> nodesToSelect = new ArrayList<TreeNode>();
// omit parent (root) if on first level
if (!"1".equals(node.getAttribute("ReportsTo"))) {
nodesToSelect.add(parent);
}
TreeNode[] siblings = employeeTree.getChildren(parent);
nodesToSelect.addAll(Arrays.asList(siblings));
RecordList recordList = employeeTreeGrid.getOriginalRecordList();
for (TreeNode treeNode : nodesToSelect) {
Record record = recordList.find("EmployeeId", treeNode.getAttribute("EmployeeId"));
if (record != null) {
employeeTreeGrid.selectRecord(record);
}
}
}
}
}
});
Have to use the RecordList and first find required records in order to use ListGrid.selectRecord() methods.
Using SelectionAppearance.CHECKBOX and SelectionChangedHandler can be tricky as programmatic selections are going to trigger further selection events.
This is based on Checkbox tree sample with below changes.
// employeeTreeGrid.setSelectionAppearance(SelectionAppearance.CHECKBOX);
// employeeTreeGrid.setShowSelectedStyle(false);
employeeTreeGrid.setShowPartialSelection(false);
// employeeTreeGrid.setCascadeSelection(true);
employeeTreeGrid.setSelectionType(SelectionStyle.SIMPLE);

Answer 3

To get the value of selected checkbox from tree grid in smart gwt I have following solution ListGridRecord[] arrRec = event.getSelection(); sample code is below.
employeeTreeGrid.setSelectionAppearance(SelectionAppearance.CHECKBOX);
employeeTreeGrid.setSelectionType(SelectionStyle.SIMPLE);
employeeTreeGrid.addSelectionChangedHandler(new SelectionChangedHandler() {
#Override
public void onSelectionChanged(SelectionEvent event)
//selectedCounties Set to add selected checkbox or deslected checkbox names/title
if (selectedCounties == null || selectedCounties.size() == 0)
selectedCounties = new TreeSet<String>();
selectedCounties.clear();
ListGridRecord[] arrRec = event.getSelection();
for (ListGridRecord listGridRecord : arrRec) {
selectedCounties.add(listGridRecord.getAttribute("Name"));
}
// You can do iteration over it if needed
selectedCounties.remove("All Counties");
Iterator<String> it = selectedCounties.iterator();
while (it.hasNext()) {
if (it.next().contains("Zone")) {
it.remove();
}
}
}
});