I want to add a link beside the node text in treeview. like the following figure:
After some googling, I found that there's no NodeTemplate in the treeview and creating the node text manually like this sample is the only way.
The only problem I have is that the built-in selection functionality isn't worked anymore, because the internal javascript select function isn't called.
Any idea about a workarround or another way to implement my goal?
Have you tried RenderPostText?
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.treenode.renderposttext.aspx
http://kb.cnblogs.com/a/1379715/
Related
In my application as soon as an object is dropped on canvas I stored it in a tree. Now, I'm trying to write a method to delete an object which is fine but I also need to delete that specific object from the tree. Each object has a unique id so this way I can find it in tree and remove it from tree while being deleted from the canvas.
In order to find a node in tree I have planned to store ID in each node (item.Tag), however, I'm facing two problems:
How can I access to details of a node from a different class? myTreeObj.Items.Tag doesn't work properly.
When I loop in tree myTreeObj.Items.Count shows more items that what I see.
Any comments will be appreciated.
Thanks.
In WPF, TreeViews are actually what they say they are: a view of a data structure. In WinForms, you had to crawl up and down the nodes of a TreeView and add them or remove them manually. In WPF, the proper approach is to add or remove items from the actual data hierarchy (to which the TreeView is binding) and use PropertyChanged or CollectionChanged notifications to tell the TreeView to update itself automatically.
What you are trying to do may be possible, but it is going to be an uphill fight all the way, and things will not work as expected. WPF REALLY wants you to use databinding, and any other approach is going to give you headaches.
This article may be a helpful place to start understanding how to work with the WPF TreeView:
http://joshsmithonwpf.wordpress.com/2008/05/24/the-wpf-treeview-is-a-view-of-a-tree/
EDIT:
The author's original article is actually more helpful:
http://www.codeproject.com/Articles/26288/Simplifying-the-WPF-TreeView-by-Using-the-ViewMode
I currently have a simple tree view that contains one parent node with multiple child nodes. I was wondering if there is a way to find the location of the selected node in the parent tree.
I currently have an action event on the treeview and when the user clicks on the child it prints out the string value of the selected child. I have tried using:
int val = TreeView.SelectedItemProperty.GlobalIndex;
but it always returns 0. I have seen some examples in VB but I cant seem to get the same idea to work in C#.
You have to use the ItemContainerGenerator property of the Treeview.
http://msdn.microsoft.com/en-us/library/system.windows.controls.itemcontainergenerator.aspx
See: ContainerFromIndex and IndexFromContainer
Note that each TreeViewItem also has an ItemContainerGenerator (its an ItemsControl), so you'd have to recursively search down the tree if you have multiple levels.
I think the answer to all your treeview problems (and most ui ones) in wpf is to build a ViewModel. Anytime you start crawling the visual tree to look for elements that you are already binding to, you are doing things the hard way. Once you start using ItemsContainerGenerator you have to start worrying about a whole lot of issues you should not have to.
You are binding to a hierarchical structure. If that structure has a selected item property on each item and it is bound to the TreeViewItem selected item then you can just get the selected item in code and do everything else from there. Have a look at a similiar question here.
So i didn't find the answer i was looking for (I may of confused others with what my question was. by saying location). Anyways how I solved it was I got the string value of the child selected and compared it to my list. Thanks to those who answered!
I want to make in a TreeView (winforms) that each node will have in it a checkbox and two icons and text.
How I can implement this thing ? I am really a newbie c# programmer.
I have found this two that helped me to understand.
treeNode
treeView
but how I can show my icons and check box one near another shifter little bit in X dimension?
Can you help me with some example how that thing can be implemented.
Thanks for help.
Customizing a tree view is not for the feint of heart. But you're lucky, this project does exactly what you are asking for.
I am using the standard asp.net treeview control to display a menu structure that is getting bound from a database. The data structure has a parentID column to represent the node relationship if one exists.
Anyway, that's not an issue, I am looking for a treeview control that would allow a user to rearrange the node by dragging them to a new position within the tree. Can anyone point me in the right direction as to any controls out there that can do this? The windows form control has the move node events. IS there something like this for web forms? Any pointers greatly appreciated.
You can have look at ExtJS TreePanel.
Drag and Drop ordering in a TreePanel
Why not try the JQuery TreeView plug-in?
http://plugins.jquery.com/project/treeview
Not sure if meets all of your non-functional requirements, but if you click on the "Try out a demonstration" link, you should be able to see if it meets your needs.
Visual Studio QuickWatch window has a hierarchical property grid control. Is a control like that available somewhere?
The default property grid control doesn't seem to work for me as it requires the objects to have an ExpandableConverter attribute to work the way I want. Although, if any of you know a way to turn the property grid into a QuickWatch-like control it would also be accepted.
Thanks.
It is very spread type of control. Each Library-of-Controls company created at least one.
http://images.google.com.ua/images?q=tree%20like%20grid
Here you have two samples:
http://www.codeproject.com/KB/grid/PropertyGridExWinForms.aspx
http://www.howtocode.net/software-development/c/propertygrid-utilities
I don't think so, its something you would have to create your self.
looks like it wouldn't be to difficult, I think its DataGridView where the first column is a custom cell that when clicked does a hit test to see if its hit a node glyph.
But i could be wrong.