|
|
Rank: Member
Groups: Member
Joined: 4/15/2011
Posts: 19
|
Hello, Can you please help using a datatable for populate treeview nodes on demand? I navigated on your demo, and i found the explanation for binding menu from datatable: DataTable binding. Here i found the code for populate on demand from an existent directory structure, but how can i do the same binding from datatable having the first example schema? Thanks
|
|
Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
|
Hi,
This is something you will need to work out yourself. The key is you will need to get all the child records from your database and then create child tree node based on your data. We can not do it for you because everybody's database structure can be different.
Thanks!
|
|
Rank: Member
Groups: Member
Joined: 4/15/2011
Posts: 19
|
Can you just please give an example? If i've got the same table of your example ( This one), how can i populate on demand? This is the table: DataTable table = ds.Tables.Add("Folders"); DataColumn folderID = table.Columns.Add("FolderID", typeof(int)); DataColumn parentFolderID = table.Columns.Add("ParentFolderID", typeof(int)); DataColumn folderName = table.Columns.Add("FolderName", typeof(string)); table.Rows.Add(new object[] { 1, null, "Root" }); table.Rows.Add(new object[] { 2, 1, "My Documents" }); table.Rows.Add(new object[] { 3, 1, "Windows" }); table.Rows.Add(new object[] { 4, 3, "System32" }); table.Rows.Add(new object[] { 5, 3, "Temp" });
|
|
Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
|
No. We do not do that. How to access your database and create TreeNode object depending on your database structure is part of your project, so this is code that you are responsible for. We do not write code for our customers so we do not do that. Even if we were willing to do it, we would not know how to do it because we do not know how to access your database. We don't even know what kind of database you use.
Thanks
|
|
Rank: Member
Groups: Member
Joined: 4/15/2011
Posts: 19
|
Ok, thanks anyway. Just another little trouble:
I've got this:
function myFunc() {
__DoPostBack('__Page', '');
}
<eo:TreeView ClientSideOnCheckStateChanging="myFunc()" ... ></eo:TreeView>
But on checkbox click DoPostBack doesn't fire. Where do i wrong?
|
|
Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
|
Hi, All our client side event handler takes a function name, not a function call. It should be "myFunc", not "myFunc()". You do not want to raises a post back inside ClientSideOnCheckStateChanging because the control is in the middle of a state change when your handler is called. If you do need to postback when user change states, you can use setTimeout to delay the call:
Code: JavaScript
function myFunc()
{
//Use setTimeout to delay the actual code
setTimeout(function()
{
__DoPostBack('__Page', '');
}, 100);
}
This way your "myFunc" will return first and __DoPostBack will be triggered later. Thanks!
|
|
Rank: Newbie
Groups: Member
Joined: 4/15/2011
Posts: 1
|
Hello,
When i create tree on demand, i call for all children of current node parentNode.ChildNodes.Add(child) method. In this phase i know if child is a leaf or another parentnode, but the treeview gives again the opportunity to expand the new node showing the + icon.
How can i hide this icon if i know this child is a leaf?
|
|
Rank: Member
Groups: Member
Joined: 4/15/2011
Posts: 19
|
I still have problems :( ASPX: <head runat="server"> <title></title> <script type="text/javascript"> function myFunc() { //Use setTimeout to delay the actual code setTimeout(function() { __DoPostBack('__Page', ''); }, 100); } </script> </head> <body> <form id="form1" runat="server"> <div> <eo:TreeView ID="tv1" runat="server" RaisesServerEvent ="True" ClientSideOnCheckStateChanging="myFunc" onitemcheckstatechanged="tv1_ItemCheckStateChanged"> <CheckBoxImages Margin="3" Visible="True" /> <TopGroup> <Nodes> <eo:TreeNode ImageUrl="00030303" ShowCheckBox="True" Text="Node"> </eo:TreeNode> </Nodes> </TopGroup> </eo:TreeView> </div> </form> </body> C# protected void Page_Load(object sender, EventArgs e) { } protected void tv1_ItemCheckStateChanged(object sender, EO.Web.TreeNodeCheckStateChangedEventArgs e) { } postback doesn't fire, i check it with a breakpoint on page_load.
|
|
Rank: Administration
Groups: Administration
Joined: 5/27/2007
Posts: 24,194
|
Hi,
For the plus-signs for a TreeNode, you will need to set the node's PopulateOnDemand to false if you already know it's a leaf node and do not need to populate further.
For the post back and event firing problem, you will need to troubleshoot yourself. The TreeView fires ClientSideOnCheckStateChanging and that's where it ends. Whatever happens afterwards would be all yours.
Thanks!
|
|