TreeView
TsgcHTMLComponent_TreeView — render a collapsible hierarchical tree from your own nodes or directly from a dataset, in Delphi, C++ Builder and .NET.
TsgcHTMLComponent_TreeView — render a collapsible hierarchical tree from your own nodes or directly from a dataset, in Delphi, C++ Builder and .NET.
A tree component that emits a Bootstrap list-group with collapsible branches. Add nodes (each with children), set the icons and indentation, then read the HTML property.
TsgcHTMLComponent_TreeView
Bootstrap 5 list-group collapsible tree
Delphi, C++ Builder, .NET
Add a node to Nodes, push child rows into its Children list, tune IndentSize and the icons, then read HTML (or drop it into a TsgcHTMLTemplate_Bootstrap page).
uses
sgcHTML_Enums, sgcHTML_Component_TreeView;
var
oTree: TsgcHTMLComponent_TreeView;
oNode: TsgcHTMLTreeNode;
begin
oTree := TsgcHTMLComponent_TreeView.Create(nil);
try
oTree.TreeID := 'fileTree';
oTree.ShowLines := True;
oTree.Selectable := True;
oTree.IndentSize := 24;
oNode := oTree.Nodes.Add;
oNode.Text := 'Documents';
oNode.Expanded := True;
oNode.Children.Add('Invoice.pdf');
oNode.Children.Add('Report.docx');
WebModule.Response := oTree.HTML; // list-group tree
finally
oTree.Free;
end;
end;
// Or build the tree straight from a self-referencing dataset:
oTree.LoadFromDataSet(qryFolders, 'ID', 'ParentID', 'Name');// includes: sgcHTML_Enums.hpp, sgcHTML_Component_TreeView.hpp
TsgcHTMLComponent_TreeView *oTree = new TsgcHTMLComponent_TreeView(NULL);
try
{
oTree->TreeID = "fileTree";
oTree->ShowLines = true;
oTree->Selectable = true;
oTree->IndentSize = 24;
TsgcHTMLTreeNode *oNode = oTree->Nodes->Add();
oNode->Text = "Documents";
oNode->Expanded = true;
oNode->Children->Add("Invoice.pdf");
oNode->Children->Add("Report.docx");
String html = oTree->HTML; // list-group tree
}
__finally
{
delete oTree;
}using esegece.sgcWebSockets;
var tree = new TsgcHTMLComponent_TreeView();
tree.TreeID = "fileTree";
tree.ShowLines = true;
tree.Selectable = true;
tree.IndentSize = 24;
var node = tree.Nodes.Add();
node.Text = "Documents";
node.Expanded = true;
node.Children.Add("Invoice.pdf");
node.Children.Add("Report.docx");
string html = tree.HTML; // list-group tree
// Or build the tree straight from a self-referencing dataset:
tree.LoadFromDataSet(qryFolders, "ID", "ParentID", "Name");The members you reach for most often.
Nodes is the TsgcHTMLTreeNodes collection; Nodes.Add returns a TsgcHTMLTreeNode with Text, Href, Icon, Expanded, Selected and NodeID.
Each node's Children is a TStringList of leaf rows; non-empty branches render a Bootstrap collapse toggle automatically.
LoadFromDataSet(aDataSet, aIDField, aParentIDField, aTextField) builds the whole tree from a self-referencing query in two passes.
ShowLines, LineColor / LineColorStyle and IndentSize control the guide lines and nesting offset; Selectable highlights the active row.
ExpandedIcon, CollapsedIcon and LeafIcon set the glyphs for open branches, closed branches and leaves (HTML entities allowed).
HTML returns the list-group tree markup and TreeID sets its element id — serve it, or assign it to a page template's BodyContent.