I followed the following tutorial (answer) to create a treeview which is bound to datatase, the only exception being that I have my treeview in a user control.
Populate WinForms TreeView from DataTable
My problem is that after adding a new node or child node the tree doesn't get updated. I have tried to refresh, expandall etc the tree but still doesn't show the newly added node. Bear in mind it is in usercontrol and I'm adding new nodes from parent form.
You might try TreeView.BeginUpdate() and TreeView.EndUpdate() methods as well, before and after the responsible code for altering nodes to your treeview.
Related
I am working with a project, in which I have a task that Names represents with hierarchy in a treeview control.
That means I must able to add the parent and child nodes to treeview and when I click Save button all the nodes should be stored in database.
My typical task is, if I retrieve the data, all the parent and child node should retrieved and added to the treeview control as I inserted hierarchy only.
Go through following links it might get you started to come with real question.
http://msmvps.com/blogs/deborahk/archive/2009/11/09/populating-a-treeview-control-from-a-list.aspx
http://www.codeguru.com/csharp/csharp/net30/article.php/c15887/Updating-a-Database-from-WinForms-Controls-Old-School.htm
I am working on a windows form application, where I connect to the database and get a list of projects and sub-projects. I am able to show this as a treeview with checkboxes, that later an user can select to do further operations.
My problem is that, I can't set the Parent node state when one of the child nodes is selected. Here, I want some indication, if any of the child nodes is selected the parent node should fill in to show that something has been selected below that parent node.
Okay, meanwhile, I found answer to my problem. Not really wise but thanks to this Simple Tri-State TreeView control. code link here.
I will definitely try to build my own custom version of this. For now, this works fine.
how we can add node to tree view dynamically in c#
Assuming this is the WinForms TreeView, see Adding and Removing Nodes with the Windows Forms TreeView Control
I have a WPF application that includes a TreeView. The user adds content to the tree using right click and context menu.
This creates a new TreeViewItem that is added to the tree's ItemCollection.
The problem is that sometimes the new items are not shown, although they were added. If you minimize/maximize the window they suddenly appear.
I tried to call TreeView.UpdateLayout() after the addition of the new item, but the result is the same.
Any suggestions?
dont add to the trees item collection. bind the treeview to an observable collection. keep the model and the view seperate. the treeview will reflect changes to the model. you should never have to call treeview.updateLayout. add your items to a collection. (your model) which is bound to the treeview. its a lot less work
I am not shure about this but try calling Refresh or call on the node witch is parent to the new node ExpandAll. Hope this works for you
Best Regards,
iordan
I have a treeview control on an aspx page. The data comes from database and I bind it to treeview control programmatically. (Parent-Child relationship in database of course)
Well and I added a textbox which I use to add new child under the selected node and it works also good but so as to see the new added node, I have to refresh and page and all the expanded nodes collapses naturally. How can I prevent that. I am also using updatepanel not to refresh whole page and to expand child nodes I am using topicTree_TreeNodePopulate event of course. When users add something under the selected node , without any refreshment or postback the recently added node should be seen right under the selected page.
Thanks in advance..
Btw I haven't much experience on Javascript so I can't do it with javascript.
You can set the Expand property of TreeNode to "false" at the time of binding Tree View or whenever you are refreshing the TreeView.