asp.net treeview by avoiding collapse and expandall - asp.net

Question

I am using ASP.NET with C# 2.0 and Visual Studio 2005. I am using a Master page and content pages. I have a treeview menu in the master page and when a user selects any menu item I redirect to that content page.
My problem is that after a user navigates to the content page all the treenodes refresh and the structure is collapsed. I want the selected treenode to stay expanded.
Can anybody help me out?

Answer 1

Are you using the treeview inside any UpdatePanel? Actually UpdatePanel does not support TreeView. I however managed the same using a lot of additional codes. You can see most of them on http://www.geekays.net/post/Using-TreeView-inside-AJAX-UpdatePanel.aspx and another post on the same site: http://www.geekays.net/post/TreeView-control-postbacks-on-check-and-uncheck-of-the-nodes-Checkbox.aspx
I added javascripts like the following also to scroll to a tree node that was selected, but the success was poor:
function scrollSelectedTviewNodeToDisplay(){
try{
var inpSelectedNode = document.getElementById("ctl00_contRMSMaster_TViewDeviceHeirarchy_SelectedNode");
var divTree = document.getElementById("ctl00_contRMSMaster_TViewDeviceHeirarchy");
if (inpSelectedNode.value != "")
{
var objScroll = document.getElementById(inpSelectedNode.value);
//my treeview is contained in a scrollable div element
var posY =findPosY(objScroll);
//alert(posY);
if (divTree){
divTree.scrollTop = posY;
//alert(divTree.nodeType);
}
//this works as well bu, but there is not as much control over the y position
//document.all(inpSelectedNode.value).scrollIntoView(true);
}
}
catch(oException)
{
//alert(document.getElementById("ctl00_contRMSMaster_divTree"));
}
}
function findPosX(obj){
var curleft = 0;
if (obj.offsetParent)
{
while (obj.offsetParent)
{
curleft += obj.offsetLeft
obj = obj.offsetParent;
}
}
else if (obj.x)
curleft += obj.x;
return curleft;
}
function findPosY(obj){
var curtop = 0;
if (obj.offsetParent)
{
while (obj.offsetParent)
{
curtop += obj.offsetTop
obj = obj.offsetParent;
}
}
else if (obj.y)
curtop += obj.y;
return curtop;
}