I have a treeview control in asp.net. It has multiple parents nodes and under each parent node, there are multiple child nodes. When I select a parent node (click on it) a TreeView event called TreeView1_SelectedNodeChanged is triggered. I can write custom code based on requirements. What I am looking for is "On Select" or "On Click" for a Child node. I do not see any events for a child tree node. How do I do this? Although I can write code for Parent node click, I dont see anything for child node click or select.
When you add the child node you can set the SelectAction:
child.SelectAction = TreeNodeSelectAction.Select
That should do it.
Related
I'm creating a context menu with two parent nodes.
I want to rewrite each child node by asynchronous processing.
I want to keep the parent node visible all the time.
How can I remove and replace all child nodes?
how to write a click event for a child node of a tree view control...
if i click the child node a static panel should be visible.
As far as I know , the only way is to programatically tell which node is selected (retrieve the appropriate node via the e.Node parameter), then fire the corresponding functionality.
This code can be placed within TreeView.AfterSelect event.
i have load a tree view. i want to Traverse treeview node and expand & select a node. Expand is working fine. but select a node is not working.
private void Traverse(TreeNodeCollection nodes, string findtext)
{
foreach (TreeNode node in nodes)
{
if (node.Text.ToString().Trim() == findtext)
{
node.Expand();
node.TreeView.SelectedNode = node.NextNode;
//tvwStructureTree.SelectedNode = this.tvwStructureTree.Nodes[node.Index];
//Select a node in Treeview tvwStructureTree But not working
tvwStructureTree.SelectedNode = node;
node.TreeView.Focus();
}
Traverse(node.Nodes, findtext);
}
}
Its in windows application.
Not quite sure what's your issue is. TreeView.SelectedNode Property is the correct property.
When you set this property, the specified node is scrolled into view
and any parent nodes are expanded so that the specified node is
visible.
When the parent node or any ancestor node of the selected node is
collapsed either programmatically or through user action, the
collapsed node becomes the selected node.
Make sure that the node.TreeView is the correct TreeView instance.
node.TreeView.SelectedNode = node.NextNode;
TreeView.HideSelection Property is another property that might useful for you.
When this property is set to false, selected nodes in the TreeView
control remain highlighted in a different color than the current
selection color when the TreeView control loses focus. You can use
this property to keep items that are selected by the user visible when
the user clicks a different control on the form or moves to a
different window.
I had a similar issue. My form's ctor is given the test of a node to select.Finding the correct node was not a problem, but the tree didn't show the node as selected, since the tree control didn't have focus. merely had to use Form.ActiveControl = myTreecontrol; before setting myTreecontrol.SelectedNode
I tested exactly your own code and worked fine, both find and selection the node!
without any particular property setting for my treeview!
by the way I am using .Net 3.5 and VS 2008
I need to populate the TreeNode.ChildNodes on the event of TreeView.TreeNodeExpanded. The problem is the node is empty before the event gets fired and it is not expandable in this case and there is no expand icon [+] showed next to it.
I want to make the node expandable in case its related object has some children without adding those children to the node.
I thought about adding a virtual child to the node and delete it when it is expanded. Are there any better options ??
Thank you.
Three steps to do the trick:
1 - Set the TreeView.ExpandDepth to 0. This eliminates the expansion of the added TreeNode objects in the TreeView and shows the expansion symbol [+] next to each TreeNode that has the TreeNode.PopulateOnDemand property set to true.
2- Set the TreeNode.PopulateOnDemand to True for each branch TreeNode. When the TreeNode.ChildNodes collection is empty, the expansion symbol [+] will be showed only next to TreeNode objects that has TreeNode.PopulateOnDemand property set to true.
3- Handle the TreeView.TreeNodePopulate event to poulate branch nodes on expansion. This event will be fired when a TreeNode - with the TreeNode.PopulateOnDemand set to true - has been expanded right before the TreeView.TreeNodeExpanded event gets fired.
I suggest editing the template of the node. Have a look at An ASP.NET AJAX TreeView control with templates.
Not sure and do not have time to try but I guess what you are after is the TreeNode.PopulateOnDemand property and TreeView.TreeNodePopulate event.
Is method that do it to be extended by icon in front of node without clicking node only?
If you can get a reference to a TreeNode object, you can call the following methods:
treeNode.Expand()
treeNode.Collapse()
These will expand and collapse any given node, assuming you want to do so programmatically rather than requiring the user to click the node.