C# - Access The Selected Node In The Treeview Using The Request Array?
Mar 4, 2010
Suppose I have a treeview, where each treenode contains an id for a different set of user controls. When the user clicks a node, these controls should be loaded to the page. As I understand the ASP page life cycle, dynamic controls should be added in the initialization stage, and postback events will fire later on.
So if the treeview click event happens after I need to add my controls, how do I dynamically add controls based on user postback events?
Edit: I tried the ArronLS:
What I did was add the node value to the session array, and use that when I do the init to choose which form elements to load to the controls of a placeholder control. On the treeview click event, I update the node in the session array, clear the old form elements in the placeholder, and add the new form elements to the controls. When the page is loaded again, it should now find the node at init time, so viewstate problems would be circumvented.
Now I haven't fully tested this yet, but there was another similar post that talks about the problems that might result with the viewstate. They suggest a solution that polls the Request[] part of the context (in their case the dropbox) within the Init control, manually handling some of the postback functionality.
My new question is how to I access the selected node in the treeview using the Request array?
I have a treeview with four levels; parent, child, grandchild, great-grandchild. My selectednode is at the grandchild level.
What I'm trying to do is to create a new "Treeview" at the grandchild - NO, I dont wnat to create a new node to the "selectednode" (grandchild). So it should be somelike this:
While populating the tree-view I have a requirement to bind the one particular level with a different colour. So, I am binding it as below
foreach (DataRow row in dr.GetChildRows("rsParentChild")) { TreeNode cChild; if (row["NAME"].ToString() != "") { if (row["Level"].ToString().Trim() == "4") { string strColor = "DarkOrange"; string fname = "<font id=" + row["NAME"].ToString() + " color ='" + strColor + "'>" + row["NAME"].ToString() + "</font>"; cChild = new TreeNode(fname, row["ID"].ToString()); } }
Now when the tree view loads, the required level 4 nodes are populated in DarkOrange. But, when any node is selected the backcolour changes as #6f9dd9 as per the style specified in the markup. But the fore-colour does not change.
Im using an asp.net treeview control and i managed to get code from these forums so that when i select a node no postback is done but i can access the selected node in my C# code behind pages by using javascript.
It works fine i can get the selected node by saying:
TreeNode t = TreeView1.SelectedNode;
and then displaying it to a label on an on click event of a button:
Label1.Text = t.Text;
But what i really need is to either display the node selected to a label (or textbox) or when a node is selected it needs to be highlighted so that the end user knows the option chosen is selected.
i ve used the following code to avoid postback and selected node style for treeview by using this im able to avoid postback but im not able to set selected node style.
I have a treeview control where I am dynamically selecting a node depending on user interaction. when a node is selected I want to be able to have the scrollbar go to the location of that selected node in the tree. The scrollbar is simply made by overflow:auto in the div tag where the treeview is located.
I don't want to use Sessions to handle each click event inside treeview selected node changed.Secondly, if you suggest me to use treenode.SelectedValue then I would say my values are dyanmically generated.Everytime a node a clicked, the selected node value is sent in the next request xml to get response and xml schema is different for each click. How do I handle this each click event other than using session variables. I thought of using Request.Item (and integrating with URL redirect property) but I don't want to use that.
Am new to asp.net.I am creating a site using asp.net(C#), in master page i have treeview control, when i select a item i navigate to url. But selected node is lost, it reset itself, loosing state.
I am having treeview with checkbox and 1 submit button it is taking values from database. Now if i check the checkbox and click the submit button it should display the selected node in the textbox..... Here is my treeview code
public void Load_tree() { DataSet PrSet = PDataset("SELECT * FROM tbl_saleschannelhierarchyconfig"); TreeView1.Nodes.Clear(); foreach (DataRow dr in PrSet.Tables[0].Rows) {
I have a button(by default disable) to create new folder, when I select the treeview node. Button will be enable on treeview node selection. On click of button.pop up window will open with textbox. I will insert folder name in textbox and submit it. Now New folder should create under selected node of treeview.
I have a treeview which will be generated dynamically which need to be displayed on left side and when user clicks on a node it need to open a page on the right side of the same page. and each node has different aspx page. so whenever user selects a node the page details should be displayed on the right side .we can use an iframe on the page which will display the different pages clicked on the node.Is there any alternative i can use to display different pages based on the user selection on the right side without using iframe.
I have a master page containing a tree and 3 dropdown lists. I am populating a context menu on right click of each node, and when clicked on any item of the context menu, it navigates to required pages.
My problem is after navigating to the required page, the selected values from the drop down lists and the selected node from the tree are getting cleared.
I can set the selected values for the dropdown lists by making some properties in master page. But how do i maintain the selected node?
In my content page, i have got the valuepath of the right clicked node.
Or is there any other way than setting the properties in master page?
I'm populating a treeview dynamically. On OnTreeNodePopulate I call a sub and populate the Parent nodes. I do not want to populate the child nodes at this time. Upto this point it works fine.
Now I would like the user to click the parent node and then populate the child node. I tried to use TreeNodeExpanded, but that is called for each parent node, so that didn't work.
I have listed data for ASP.net control TreeView. I wanted to disable a particular node/parentnode in the listed TreeView. I wanted to do this using jQuery.
after populating treeview and i want to traverse in all the node and want to attach javascript if the node has child node. how to do it in asp.net when work with treeview control.
I am using a treeview control. I am buliding the tree dynamically. sometimes the tree becomes larger and the down scroll bar is need to see the entire tree. user can select a node from the tree. if one node is selected ,i change the color of the node from server side.
my problem is that if a user selected a node which is bottom in the tree(means, the user used the down scrollbar to see that node), after postback it shows the top of the tree.to see the selected node the user need to use the down scroll bar.
I need to show the selected node after postback. How can I do this?
