gojs
Version:
Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html>
<head>
<meta charset="UTF-8">
<title>GoJS Tree View</title>
<meta name="description" content="A traditional tree view using TreeLayout and orthogonal links." />
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- Copyright 1998-2020 by Northwoods Software Corporation. -->
<script src="../release/go.js"></script>
<script src="../assets/js/goSamples.js"></script> <!-- this is only for the GoJS Samples framework -->
<script id="code">
// use a V figure instead of MinusLine in the TreeExpanderButton
go.Shape.defineFigureGenerator("ExpandedLine", function(shape, w, h) {
return new go.Geometry()
.add(new go.PathFigure(0, 0.25*h, false)
.add(new go.PathSegment(go.PathSegment.Line, .5 * w, 0.75*h))
.add(new go.PathSegment(go.PathSegment.Line, w, 0.25*h)));
});
// use a sideways V figure instead of PlusLine in the TreeExpanderButton
go.Shape.defineFigureGenerator("CollapsedLine", function(shape, w, h) {
return new go.Geometry()
.add(new go.PathFigure(0.25*w, 0, false)
.add(new go.PathSegment(go.PathSegment.Line, 0.75*w, .5 * h))
.add(new go.PathSegment(go.PathSegment.Line, 0.25*w, h)));
});
function init() {
if (window.goSamples) goSamples(); // init for these samples -- you don't need to call this
var $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
$(go.Diagram, "myDiagramDiv",
{
allowMove: false,
allowCopy: false,
allowDelete: false,
allowHorizontalScroll: false,
layout:
$(go.TreeLayout,
{
alignment: go.TreeLayout.AlignmentStart,
angle: 0,
compaction: go.TreeLayout.CompactionNone,
layerSpacing: 16,
layerSpacingParentOverlap: 1,
nodeIndentPastParent: 1.0,
nodeSpacing: 0,
setsPortSpot: false,
setsChildPortSpot: false
})
});
myDiagram.nodeTemplate =
$(go.Node,
{ // no Adornment: instead change panel background color by binding to Node.isSelected
selectionAdorned: false,
// a custom function to allow expanding/collapsing on double-click
// this uses similar logic to a TreeExpanderButton
doubleClick: function(e, node) {
var cmd = myDiagram.commandHandler;
if (node.isTreeExpanded) {
if (!cmd.canCollapseTree(node)) return;
} else {
if (!cmd.canExpandTree(node)) return;
}
e.handled = true;
if (node.isTreeExpanded) {
cmd.collapseTree(node);
} else {
cmd.expandTree(node);
}
}
},
$("TreeExpanderButton",
{ // customize the button's appearance
"_treeExpandedFigure": "ExpandedLine",
"_treeCollapsedFigure": "CollapsedLine",
"ButtonBorder.fill": "whitesmoke",
"ButtonBorder.stroke": null,
"_buttonFillOver": "rgba(0,128,255,0.25)",
"_buttonStrokeOver": null
}),
$(go.Panel, "Horizontal",
{ position: new go.Point(18, 0) },
new go.Binding("background", "isSelected", function(s) { return (s ? "lightblue" : "white"); }).ofObject(),
$(go.Picture,
{
width: 18, height: 18,
margin: new go.Margin(0, 4, 0, 0),
imageStretch: go.GraphObject.Uniform
},
// bind the picture source on two properties of the Node
// to display open folder, closed folder, or document
new go.Binding("source", "isTreeExpanded", imageConverter).ofObject(),
new go.Binding("source", "isTreeLeaf", imageConverter).ofObject()),
$(go.TextBlock,
{ font: '9pt Verdana, sans-serif' },
new go.Binding("text", "key", function(s) { return "item " + s; }))
) // end Horizontal Panel
); // end Node
// without lines
myDiagram.linkTemplate = $(go.Link);
// // with lines
// myDiagram.linkTemplate =
// $(go.Link,
// { selectable: false,
// routing: go.Link.Orthogonal,
// fromEndSegmentLength: 4,
// toEndSegmentLength: 4,
// fromSpot: new go.Spot(0.001, 1, 7, 0),
// toSpot: go.Spot.Left },
// $(go.Shape,
// { stroke: 'gray', strokeDashArray: [1,2] }));
// create a random tree
var nodeDataArray = [{ key: 0 }];
var max = 499;
var count = 0;
while (count < max) {
count = makeTree(3, count, max, nodeDataArray, nodeDataArray[0]);
}
myDiagram.model = new go.TreeModel(nodeDataArray);
}
function makeTree(level, count, max, nodeDataArray, parentdata) {
var numchildren = Math.floor(Math.random() * 10);
for (var i = 0; i < numchildren; i++) {
if (count >= max) return count;
count++;
var childdata = { key: count, parent: parentdata.key };
nodeDataArray.push(childdata);
if (level > 0 && Math.random() > 0.5) {
count = makeTree(level - 1, count, max, nodeDataArray, childdata);
}
}
return count;
}
// takes a property change on either isTreeLeaf or isTreeExpanded and selects the correct image to use
function imageConverter(prop, picture) {
var node = picture.part;
if (node.isTreeLeaf) {
return "images/document.svg";
} else {
if (node.isTreeExpanded) {
return "images/openFolder.svg";
} else {
return "images/closedFolder.svg";
}
}
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: 1px solid black; width: 300px; height: 500px"></div>
<p>
This shows how to create a traditional "TreeView" in a <b>GoJS</b> diagram.
There are 500 nodes in the tree.
</p>
<p>
Look at this page's source code to see how the properties on the <a>TreeLayout</a> are set.
</p>
<p>
The node template makes use of a "TreeExpanderButton" panel to implement the expand/collapse button.
It also implements a custom doubleClick function to allow nodes to be expanded/collapsed on double-click.
Lastly, the source of the picture on each node is bound to two different properties, <a>Node.isTreeLeaf</a> and
<a>Node.isTreeExpanded</a>; the <b>imageConverter</b> function is used to select the correct image
based on these properties.
</p>
<p>There are two link templates in the source code, one which uses no lines, and one which connects the items with dotted lines.</p>
<p>
See the <a href="../intro/buttons.html" target="_blank">Intro page on Buttons</a> for more GoJS button information.
The <a href="triStateCheckBoxTree.html" target="_blank">Tri-state CheckBox Tree</a> sample demonstrates a "tree view" where each item
has a three-state checkbox.
The <a href="treeMapper.html" target="_blank">Tree Mapper</a> sample demonstrates how to map (draw associations) between items in two trees.
The <a href="updateDemo.html" target="_blank">Update Demo</a> sample also uses a "tree view" for its own purposes.
</p>
<p>The icons in this sample are from <a href="https://icons8.com/" target = "blank">icons8.com</a></p>
</div>
</body>
</html>