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.
Related
I am currently looking for a control that allows me to show only few informations when the control is fold. And when we click on the control, the control is unfold and all the information of the control are showed. I have checked if I could use ListView but I did not see a match and the TreeView does not fit my will because it's not a child node but the same node showed in a different way.
Can you help me find a control that could fit my needs ?
Thanks in advance.
You could look into the Expander control. You can modify the control template to customize how it looks and behaves.
I am using the following Infragistics component for viewing hierarchical data.
http://www.igniteui.com/tree/drag-and-drop-single-tree
I could able to load data correct but the problem is wI cant expand multiple nodes simultaneously. I mean when I expand a node the other node collapsed expanding only the current node. Can some one please suggest if there is any configuration setting I am missing to accomplish this?
I want the nodes once expanded will remain expanded until user collapses it again.
Thanks,
Krishna Prasad
The option that controls that is singleBranchExpand. Set it to false to allow multiple nodes to be expanded at the same time. http://jsfiddle.net/ywtLL7ka/
$("#tree").igTree({
singleBranchExpand: false,
});
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 am making a windows application in C#.
I want to use the checkbox that comes in windows 7 control panel program feature.
If the subcheckboxes of the tree are all not selected then the parent checkbox should be filled
If all subitems are selected then the parent checkbox should be checked
If all subitems are unselected then the parent checkbox should be unselected.
I am using separate checkboxes (like checkboxImageList, found in google), not a treeview checkbox.
Well, a treeview checkbox would save you a lot of hassle here, because you can just use LINQ to check or uncheck all nodes when a node is clicked by handling the Click event (let's say clickedItem is the node that was clicked:
foreach (TreeNode node in clickedItem.Nodes.ToList())
{
node.IsSelected = clickedItem.IsSelected;
}
Also, from a user interface point of view, the TreeView makes sense. If you absolutely insist on using individual checkboxes, then you just build a tree of CheckBox items in memory, perhaps using something like this sample Tree<T> data type, and then when you click on a checkbox, just recursively travel through the tree until you've checked every box under that one.
But consider what will happen with your app. You might have so many options in the future that you'll need a way to programatically add them. You might need scrolling. You might need to make the entire thing configurable. And once you've added all that, you'll just have re-implemented TreeView.
Maybe you should better use a TreeView. Here's an example of a TreeView managing alone the mid-check state.
I've got windows form app I'm developing, and my client wants a TreeView on the left with nodes that when clicked allow their users to work in detail screens on the right. The simplest approach was to create panels which are disabled until the appropriate node is clicked. However, this app is growing and way too much of it is living in the main form.
I'm wondering if it is possible to have one form per node that will open and expand into the detail area on the right, and then close when I am done with it. That way I don't have a single monolithic form, however I am not sure of how to go about that.
Anybody have any insight into how to do something like that?
Thanks.
You should try using UserControls.
Basically, each UserControl is a form (more or less) that you can add to your main form just like you would any other control.
I would inherit from Panel for each page, attach an instance of each Panel-derived object to the Tag property of each TreeView node, and display that (Dock=Fill) when a node is selected.
You can use split controls and load the forms right side but needs to arrange it correctly. As #codethis mentioned, usercontrol is best enough to handle these as their code is written separately. Just you need to pass the parameter (from node selection).
You may need to multiple user controls and place them in your form according to your screen changes.