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.
Related
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.
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 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.
i want to add the check box to the child node of a certain parent node in the tree view in my application...How should i add it?
TreeView has a property with the name CheckBoxes, if set to true, it shows checkboxes for all child nodes.
The TreeView API only allows you to add/remove checkboxes for EVERY node. If that's what you want, then the answer is easy - use the TreeView's CheckBoxes property.
If you want a checkbox for a particular node in the tree only, then it gets tricky. .NET doesn't directly support that. You can get the tree to accept it using Win32 message overrides, see the link below for a solution elsewhere:
http://dotnetfollower.com/wordpress/2011/05/winforms-treeview-hide-checkbox-of-treenode/
You can't show checkboxes only for some TreeNodes - only for all of them or none at all.
To enable the checkboxes for your tree set the CheckBoxes property to true.
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.