Dev ComboxTree implementation

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The ASPxDropDownEdit ASPxTreeView controls must be used.

The dll corresponding to ASPxDropDownEdit is DevExpress. Web. ASPxEditors. v12.1.dll.

Web. the configuration in config is: <add tagPrefix = "dx" namespace = "DevExpress. web. ASPxEditors "assembly =" DevExpress. web. ASPxEditors. v12.1, Version = 12.1.8.0, Culture = neutral, PublicKeyToken = b88d1754d700e49a "/>

 

The dll corresponding to ASPxTreeView is DevExpress. Web. v12.1.dll.

Web. the configuration in config is: <add tagPrefix = "dx" namespace = "DevExpress. web. ASPxTreeView "assembly =" DevExpress. web. v12.1, Version = 12.1.8.0, Culture = neutral, PublicKeyToken = b88d1754d700e49a "/>

First:

<Dx: ASPxDropDownEdit ID = "ddNodes" runat = "server" ClientInstanceName = "ddNodes" AllowUserInput = "false" Width = "200px"> <DropDownWindowTemplate> <dx: ASPxTreeView ID = "tvNodes" runat = "server" ClientInstanceName = "tvNodes" AllowSelectNode = "true" Success = "true"> <ClientSideEvents NodeClick = "OnNodesTreeViewNodeClick"/> <! -- Js method for assigning values to controls --> </dx: ASPxTreeView> </DropDownWindowTemplate> </dx: ASPxDropDownEdit>

How to assign values to controls using js

function OnNodesTreeViewNodeClick(s, e) {            if (e.node.nodes.length > 0)                return;            ddNodes.SetKeyValue(e.node.name);            ddNodes.SetText(e.node.GetText());            ddNodes.HideDropDown();        }

Background code implementation

ASPxTreeView tvNodes = ddNodes. FindControl ("tvNodes") as ASPxTreeView;
TreeViewCreateNodes (data list, tvNodes. Nodes, "0"); // method for creating TreeViewNodes
TvNodes. SelectedNode = TreeViewSelectedNode (tvNodes, '5'); // 5 indicates the ID of the selected node.
DdNodes. Text = tvNodes. SelectedNode. Text;
DdNodes. KeyValue = tvNodes. SelectedNode. Name;

/// <Summary>
/// Create a TreeViewNodes Node
/// </Summary>
/// <Param name = "table"> </param>
/// <Param name = "nodesCollection"> </param>
/// <Param name = "parentID"> </param>
Public static void TreeViewCreateNodes (IList <T> table, TreeViewNodeCollection nodesCollection, string parentID)
{
For (int I = 0; I <table. Count; I ++)
{
If (table [I]. ParentID = parentID)
{
TreeViewNode node = new TreeViewNode (table [I]. Name, table [I]. ID );
NodesCollection. Add (node );
TreeViewCreateNodes (table, node. Nodes, node. Name );
}
}
}

/// <Summary>
/// Obtain the selected node of TreeViewNodes
/// </Summary>
/// <Param name = "tvn"> </param>
/// <Param name = "selectID"> </param>
/// <Returns> </returns>
Public void TreeViewSelectedNode (ASPxTreeView tvNodes, string selectID)
{
Foreach (TreeViewNode tvn in tvNodes. Nodes)
{
TvNodes. SelectedNode = TreeViewSelectedNode (tvn, selectID );
If (tvNodes. SelectedNode! = Null)
Break;
}
}

/// <Summary>
/// Obtain the selected node of TreeViewNodes
/// </Summary>
/// <Param name = "tvn"> </param>
/// <Param name = "selectID"> </param>
/// <Returns> </returns>
Private TreeViewNode TreeViewSelectedNode (TreeViewNode tvn, string selectID)
{
If (tvn. Name = selectID)
{
Return tvn;
}
Else if (tvn. Nodes. Count> 0)
{
Foreach (TreeViewNode tvnChild in tvn. Nodes)
{
TreeViewNode tvns = TreeViewSelectedNode (tvnChild, selectID );
If (tvns! = Null)
Return tvns;
}
}
Return null;
}

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