如果我向下滚动到某个特定节点并选择它来显示子节点，我的树视图会自行重置，以便第一个节点返回到页面顶部。如果我向下滚动到所选节点，我确实看到节点已打开并且显示了子节点，但是如何使树视图保持不变，以便用户不必向下滚动以查看其所选节点？
这是我的代码：
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<ContentTemplate>
<div id="divTreeViewScrollTo">
<asp:Panel ID="pnl" runat="server" Height="370px" Width="760px" BackColor="#ffffff" ScrollBars="Auto">
<asp:TreeView ID="TreeViewAccts" runat="server" ShowLines="true" PopulateNodesFromClient="false" OnSelectedNodeChanged="TreeView1_SelectedNodeChanged1" Height="118px" ShowExpandCollapse="true" Font-Size="X-Small" Width="645px" NodeIndent="10" Font-Bold="True" ForeColor="White" ExpandDepth="0">
<NodeStyle VerticalPadding="1"
Font-Names="Courier"
Font-Size="8pt"
NodeSpacing="0"
HorizontalPadding="5"
BorderStyle="Solid"
BorderColor="DarkCyan"
BorderWidth="1"
BackColor="White"
Width="640">
</NodeStyle>
</asp:TreeView>
<asp:TextBox ID="txtTreeselect" runat="server" Enabled="False" Visible="False"></asp:TextBox>
</asp:Panel>
</div>
</ContentTemplate>
</asp:Content>
public partial class frmManageAccts : System.Web.UI.Page
{
public string stringSelectedValue { get; set; }
string str = System.Configuration.ConfigurationManager.ConnectionStrings["PBRConnectionString"].ConnectionString;
public string MySortVal;
public string MySortVal2;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
FillTree_Parent();
}
}
void FillTree_Parent()
{ // fills the parent view of the Tree Action items
//int RoleID = Convert.ToInt32(ddlRole.SelectedValue);
using (SqlConnection con4 = new SqlConnection(ConfigurationManager.ConnectionStrings["PBRConnectionString"].ConnectionString))
{
try
{
SqlCommand cmd2 = new SqlCommand("SELECT [ACCT_GRP], [ACCT_GRP_PK], [ACTIVE_FLG], [LOAD_BY], [LOAD_TIMESTAMP] FROM [ACCT_GRP_LIST] ORDER BY [ACCT_GRP] ASC", con4);
SqlDataAdapter da = new SqlDataAdapter(cmd2);
DataSet PrSet = new DataSet();
da.Fill(PrSet, "ACCT_GRP");
TreeViewAccts.Nodes.Clear();
foreach (DataRow dr in PrSet.Tables[0].Rows)
{
DateTime date = DateTime.Parse(dr["LOAD_TIMESTAMP"].ToString());
string formatted = date.ToString("MM/dd/yyyy");
TreeNode tnParent = new TreeNode();
tnParent.Text = dr["ACCT_GRP"].ToString().Replace("'", "''").Trim() +
SpaceCount(dr["ACCT_GRP"].ToString().Replace("'", "''").Trim(), 55) +
"Active: " +
dr["ACTIVE_FLG"].ToString() +
SpaceCount("XXXXX", 10) +
"Loaded On: " + formatted + "";
tnParent.Value = dr["ACCT_GRP_PK"].ToString();
// tnParent.Tag = dr["Disp"].ToString();
tnParent.PopulateOnDemand = true;
// tnParent.ToolTip = "You Must Choose a Reason";
tnParent.SelectAction = TreeNodeSelectAction.SelectExpand;
// tnParent.Expand();
// tnParent.Selected = true;
//TreeViewAccts.BorderStyle = BorderStyle.Solid;
//TreeViewAccts.BorderColor = Color.Aquamarine;
//TreeViewAccts.BackColor = Color.Yellow;
TreeViewAccts.Nodes.Add(tnParent);
FillTree_Child(tnParent, tnParent.Value);
}
}
catch (Exception ae)
{
Response.Write(ae.Message);
//ErrorLogging.WriteToEventLog(ae);
}
}
}
public void FillTree_Child(TreeNode parent, string ParentId)
{ // fills the child action items of the tree
//int RoleID = Convert.ToInt32(ddlRole.SelectedValue);
using (SqlConnection con5 = new SqlConnection(ConfigurationManager.ConnectionStrings["PBRConnectionString"].ConnectionString))
{
try
{
SqlCommand cmd2 = new SqlCommand("SELECT [ACCT_NUM], [ACCT_PK], [ACTIVE_FLG], [DOS] FROM [ACCT_LIST] where [ACCT_GRP_FK] = '" + ParentId + "' ORDER BY ACCT_NUM ASC", con5);
SqlDataAdapter da = new SqlDataAdapter(cmd2);
DataSet PDataset = new DataSet();
da.Fill(PDataset, "ACCT_NUM");
DataSet ds = PDataset;
parent.ChildNodes.Clear();
foreach (DataRow dr in ds.Tables[0].Rows)
{
DateTime date = DateTime.Parse(dr["DOS"].ToString());
string formatted = date.ToString("MM/dd/yyyy");
TreeNode child = new TreeNode();
child.Text = dr["ACCT_NUM"].ToString().Trim() +
" " +
"Active: " +
dr["ACTIVE_FLG"].ToString() +
" " +
"Service Date: " + formatted + "";
child.Value = dr["ACCT_PK"].ToString().Trim();
// if (child.Node.Count == 0)
// child.PopulateOnDemand = true;
//child.ToolTip = "Click to get Child";
// child.SelectAction =TreeNodeSelectAction.SelectExpand;
child.CollapseAll();
parent.ChildNodes.Add(child);
//TreeViewAccts.BorderStyle = BorderStyle.Solid;
//TreeViewAccts.BorderColor = Color.Aquamarine;
//TreeViewAccts.BackColor = Color.Yellow;
}
}
catch (Exception ae)
{
Response.Write(ae.Message);
//ErrorLogging.WriteToEventLog(ae);
}
}
}
protected void TreeView1_SelectedNodeChanged1(object sender, EventArgs e)
{ // handles action items from the tree when selected
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "selectNode", "var elem = document.getElementById('" + TreeViewAccts.ClientID + "_SelectedNode');var node = document.getElementById(elem.value);node.scrollIntoView(true);elem.scrollLeft=0;", true);
// txtTreeselect.Text = TreeView1.SelectedNode.Text.ToString();
if (TreeViewAccts.SelectedNode.Text == "External Pend")
{
txtTreeselect.Text = TreeViewAccts.SelectedValue.ToString();
//Module.Text = TreeView1.SelectedNode.Text.ToString();
}
else if (TreeViewAccts.SelectedNode.Text == "Internal Pend")
{
txtTreeselect.Text = TreeViewAccts.SelectedValue.ToString();
// Module.Text = TreeView1.SelectedNode.Text.ToString();
}
else
{
TreeViewAccts.CollapseAll();
txtTreeselect.Text = TreeViewAccts.SelectedValue.ToString();
// txtTreeselect.Text = TreeView1.SelectedValue.ToString();
// Module.Text = TreeView1.SelectedNode.Text.ToString();
}
}
public static string SpaceCount(string Incoming, int TSpace)
{
// Cached length.
int cl = TSpace - Incoming.Length;
string Spacer = "";
int i = 0;
do
{
Spacer = Spacer + " ";
i++;
} while (i < cl);
return Spacer;
}
}
答案 0 :(得分：0)
在展开节点时，您的网页似乎正在回发。如果是这种情况，那么您需要使用JavaScript解决方案来通过回发来维护页面的滚动位置。这个网站有一个很好的教程：http://www.4guysfromrolla.com/articles/111704-1.aspx