Is is possible to display a node without children as a leaf node within the .NET 3.5 TreeView control?
I have a treeview that displays a list of companies as nodes which would each display leaf nodes for documents belonging to that company.
If a company exists without any documents I would still like it to be rendered as parent (folder) but it renders as a leaf (file).
I could add a "No Documents" node to the company but this seems ugly and would add overhead to manage whether or not the node is there or should be added.
There doesnt seem to be any properties on TreeNode that would help here
Any ideas?
Thanks
The only way I discovered to resolve this issue is to add a "No Document" leaf to any empty parent folder
Related
Can kendo treeview be filtered based on parent Node text?? I have a treeview with user name as parent node and user details as child nodes. I need to perform a search based on User name.
Please help
No built-in or easy way to do this. The treeview is composed of multiple dataSources for each branch. So you need o recursively iterate through all the children dataSources and use their filter method.
Basically, I'm working on a winforms application. Now I'm stuck in a problem in which I want a tree grid view that displays nodes in DataGridView. I already used customized DataGridView that that displays child nodes. But what I want is to add another DataGridView in a child node. Meaning, when a user expands a node, a data grid view displays as a child node. Please help me.
Have a look at the following code project article in which a Dropdown box is added as a treenode item. The article extends the TreeNode and adds a ComboxBox. It should be fairly simple to extend to a DataGridView
http://www.codeproject.com/Articles/14544/A-TreeView-Control-with-ComboBox-Dropdown-Nodes
In my application i copy a certain pdf file to the selected node, after this i want the treeview to refresh and show me the added file.
The refresh is working but it won't expand the last selected node.
How can i do a refresh but still keep the last selected node expanded, so the user can see that the pdf file is added to the folder.
The AfterSelect on the TreeView have a parameter TreeViewEventArgs e. e.Node will return the selected node. eg:
e.Node.Expand();
or
e.Node.ExpandAll();
Should you wish to expand all the nodes in the treeview. You can use the same method to expand the
I assume that you know which node you have copied it too. Use the same method to expand the node you've copied too.
I want to create an expandable empty treenode in C#, i.e. a treenode which is empty and has the [+] sign beside it. The reason is because initially it is empty, but once a node is clicked, I want to populate it with many child nodes.
The only problem I am facing is that empty treenodes aren't expandable, so I don't know what to do. Is there a way to solve this problem, or are there any workarounds?
You have to redraw the tree itself, or create an empty node and simply remove it when the parent node is expanded.
Personally, I'd go for option b). I've done this before, a while ago and thanks to the events raised by the TreeView it pretty easy to accomplish.
You can give the empty node a value like 'Loading...' so it gives some feedback to the user as well. :)
Add a dummy child node, and remove it when you expand.
Have a look at Josh Smiths excellent tutorial on treeviews. It allows lazy loading of child tree nodes by having a dummy node that is removed upon expansion.
I have a Silverlight project where the main objects are just a bunch of nodes that are joined to each other. A parent node can have many children.
I want to be able to bind the nodes to an itemscontrol or similar and so was wondering how to best structure the parent child relationship.
Is it OK to create a flat top level list of all nodes (List allNodes) and add each node to that, binding the list to the itemscontrol, then on top of that add each node to it's parent's 'childnodes' list to establish the structure - or am I doing some kind of ugly doubling up?
Just hoping there is some kind of best practice or pattern I can latch on to
Thanks
You should use the treeview found in the official silverlight toolkit. Here is an online demo.