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Rank: Advanced Member
Groups: Member
Joined: 8/24/2007
Posts: 130
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Hi,
I have recently moved from version 7 to version 8. In version 7, the treeview was maintaining its scroll position on callback. I am finding in version 8 that this is no longer happening.
I noticed a post a while back that said that this was a known issue and you are working on it. Is this still the case? If so, will we get a fix any time soon?
Regards,
Phil wynn
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Hi,
We are not aware of that the issue still exists in the latest build. Can you provide a test page that demonstrates the issue?
Thanks!
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Rank: Advanced Member
Groups: Member
Joined: 8/24/2007
Posts: 130
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Hi, I have put together the following example to demonstrate my problem. A context menu is used to add new nodes to the tree. If you scroll down to the bottom of the tree and add a new node, the scroll position is lost on callback. If you run the same code on version 7, the scroll position is maintained. This may seem like a contrived example, but it is causing us many problems, and we have had to roll back the upgrade as a result.
Code: HTML/ASPX
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="IIPay.Web.WebForm1" %>
<%@ Register Assembly="EO.Web" Namespace="EO.Web" TagPrefix="eo" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<script>
function ShowContextMenu(e, treeView, node) {
var contextMenuItem = eo_GetObject('<%=contextMenu.ClientID%>').getTopGroup().getItemByIndex(0);
contextMenuItem.setValue(node.getPath());
eo_ShowContextMenu(e, "<%=contextMenu.ClientID%>");
return true;
}
function ContextClicked(evt, eventInfo) {
eo_Callback('<%=callbackPanel.ClientID%>', eventInfo.getItem().getValue());
return true;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<eo:CallbackPanel ID="callbackPanel" runat="server" Width="600" OnExecute="treePanel_Execute">
<div style="width: 49%; height: 300px; float: left;">
<eo:TreeView ID="bindingTree" CausesValidation="false" AllowDragDrop="false" AllowEdit="false"
AllowMultiSelect="false" Indent="20" PathSeparator="," EnableViewState="false"
runat="server" ControlSkinID="None" Height="100%" OnItemPopulate="bindingTree_ItemPopulate"
ClientSideOnContextMenu="ShowContextMenu">
<TopGroup>
<Nodes>
<eo:TreeNode Text="Root Node" ItemID="root"></eo:TreeNode>
</Nodes>
</TopGroup>
<LookNodes>
<eo:TreeNode ItemID="_Default" ExpandedImageUrl="00030302" CollapsedImageUrl="00030301"
ImageUrl="00030302" NormalStyle-CssText="PADDING:1px; COLOR:black; cursor:pointer; BACKGROUND-COLOR:transparent;"
SelectedStyle-CssText="PADDING:1px; COLOR:black; cursor:pointer; BACKGROUND-COLOR:#e0e0e0; font-weight:bold;">
</eo:TreeNode>
</LookNodes>
</eo:TreeView>
</div>
</eo:CallbackPanel>
<eo:ContextMenu ID="contextMenu" runat="server" ClientSideOnItemClick="ContextClicked">
<LookItems>
<eo:MenuItem ItemID="_Default" HoverStyle-CssText="cursor:pointer; color:White; background-color:#353F7D;">
<SubMenu ExpandEffect-Type="GlideLeftToRight" Style-CssText="font-size:8pt; padding:5px; color:White; background-color:#353F7D; "
CollapseEffect-Type="gliderighttoleft" OffsetX="5" OffsetY="5" ShadowDepth="4"
ItemSpacing="1" />
</eo:MenuItem>
</LookItems>
<TopGroup>
<Items>
<eo:MenuItem ItemID="menuItem1" Text-Html="Add Node" />
</Items>
</TopGroup>
</eo:ContextMenu>
</form>
</body>
</html>
Code: C#
using System;
using System.Text;
using EO.Web;
namespace IIPay.Web
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
PopulateFirstLevel();
bindingTree.TopGroup.Nodes[0].ExpandPath();
}
}
private void PopulateFirstLevel()
{
for (int i = 0; i < 20; i++)
{
TreeNode node = new TreeNode("Node #" + i);
node.PopulateOnDemand = true;
node.ItemID = node.Text;
bindingTree.TopGroup.Nodes[0].ChildNodes.Add(node);
}
}
protected void treePanel_Execute(object sender, CallbackEventArgs e)
{
TreeNode parentNode = PopulateToSpecifiedNode(e.Parameter);
if (parentNode != null)
{
TreeNode node = new TreeNode(parentNode.Text + "-" + parentNode.SubGroup.Nodes.Count);
node.ItemID = node.Text;
parentNode.SubGroup.Nodes.Add(node);
node.ExpandPath();
node.Selected = true;
}
}
private TreeNode PopulateToSpecifiedNode(string nodePath)
{
PopulateFirstLevel();
TreeNode node = (TreeNode) bindingTree.FindItem(nodePath);
if(node != null)
{
return node;
}
string[] nodeIds = nodePath.Split(new[] { ',' });
node = (TreeNode)bindingTree.FindItem(nodeIds[0] + "," + nodeIds[1]);
for (int index = 2; index < nodeIds.Length; index++)
{
TreeNode childNode = new TreeNode(nodeIds[index]);
childNode.ItemID = childNode.Text;
node.SubGroup.Nodes.Add(childNode);
node = childNode;
}
return node;
}
public void bindingTree_ItemPopulate(object sender, NavigationItemEventArgs e)
{
//Get the parent tree node
TreeNode treeNode = (TreeNode)e.NavigationItem;
CreateSubNodes(treeNode);
}
private static void CreateSubNodes(TreeNode parentNode)
{
for (int i = 0; i < 10; i++)
{
TreeNode node = new TreeNode(parentNode.Text + "-" + i);
node.ItemID = node.Text;
parentNode.SubGroup.Nodes.Add(node);
}
}
}
}
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Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
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Hi, Please try to make the following change: 1. Place an eo:ScriptEvent control in the page; 2. Set that control as the CallbackPanel trigger; 3. Instead of calling eo_Callback in your script, call
Code: JavaScript
//Please replace cmd_name and cm_args with anything. These two
//values are passed to the server side Command event
eo_TriggerServerEvent("<%=ScriptEvent1.ClientID%>", cmd_name, cmd_args);
You would then handle the ScriptEvent's Command event instead of the CallbackPanel's Execute event. The TreeView should work fine as soon as you go through a trigger. Thanks!
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Rank: Advanced Member
Groups: Member
Joined: 8/24/2007
Posts: 130
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That has sorted the problem. Thank you.
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