Tree view selected node event is not firing

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Hi
I have used a tree view in my project, in which i have populated the treeview through an xml data source.
I want when a tree node is clicked or selected then i will take the url from navigateurl and append some of my query strings.
But when i click a tree node then it is not firing the selected node changed event
and directly going to the url in the navigateurl

Any Help

Posted 25-May-11 1:35am

TanzeelurRehman

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Timberbird 25-May-11 7:52am

What do your node items represent? Aren't they links to some other page?

TanzeelurRehman 25-May-11 7:55am

In the node url field i have kept the url of the destination page but i want to append a query string with the url, thats why i need to fire the selectednode changed event, but it is not firing, it moves directly to the url specified in the navigate url field

Timberbird 25-May-11 8:10am

That may be by design if NavigateURL property is set. Check this

TanzeelurRehman 25-May-11 8:18am

It seems that the link which you have sent is in russian language

Timberbird 25-May-11 9:01am

Sorry, my bad. Here it goes: TreeNode.NavigateUrl

TanzeelurRehman 26-May-11 2:24am

Thankyou brother
I know that NavigateURl property is used to get and set the url for the node, i dont want so, I want to fire the selectednode event but due to the value in navigateurl property it is jumping to the url mentioned and skips the selectednoede event

Timberbird 26-May-11 2:53am

Well, what I wanted to point in this article (sorry for not being clear) is this part:
"The text of a node can be in one of two modes: selection mode or navigation mode. By default, a node is in selection mode. To put a node into navigation mode, set the node's NavigateUrl property to a value other than an empty string.

When a node is in navigation mode, all selection events are disabled for that node. Clicking the node in navigation mode links the user to the specified URL. You can optionally set the Target property to specify the window or frame in which to display the linked content"

TanzeelurRehman 26-May-11 3:04am

ok then how can i set it to only selection mode so that i can fire the selectednode event

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Timberbird · Accepted Answer · 2011-05-25T21:26:00

Solution 1

Do not fill NavigateUrl field then - consider adding URL into TreeNode.Value field instead (I believe it may be done via editing DataBindings of your TreeView) and in your SelectedNodeChanged handler use, for example, Page.Server.Transfer()

Posted 25-May-11 21:26pm

Timberbird

Comments

TanzeelurRehman 26-May-11 3:47am

I have tried already that way, but problem is that it is giving error, when the tree node is clicked.

Timberbird 26-May-11 4:00am

What kind of error is it?

TanzeelurRehman 26-May-11 4:31am

Error Source

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[NullReferenceException: Object reference not set to an instance of an object.]
System.Xml.XmlLoader.Load(XmlDocument doc, XmlReader reader, Boolean preserveWhitespace) +24
System.Xml.XmlDocument.Load(XmlReader reader) +114
System.Web.UI.WebControls.XmlDataSource.PopulateXmlDocument(XmlDocument document, CacheDependency& dataCacheDependency, CacheDependency& transformCacheDependency) +239
System.Web.UI.WebControls.XmlDataSource.GetXmlDocument() +156
System.Web.UI.WebControls.XmlHierarchicalDataSourceView.Select() +17
System.Web.UI.WebControls.TreeView.DataBindNode(TreeNode node) +133
System.Web.UI.WebControls.TreeView.PerformDataBinding() +307
System.Web.UI.WebControls.HierarchicalDataBoundControl.PerformSelect() +99
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74
System.Web.UI.WebControls.TreeView.DataBind() +4
System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +66
System.Web.UI.WebControls.TreeView.OnPreRender(EventArgs e) +45
System.Web.UI.Control.PreRenderRecursiveInternal() +103
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Control.PreRenderRecursiveInternal() +175
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496

Timberbird 26-May-11 4:41am

Check this page - something's wrong with the DataSource