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 with Check Boxes</title>
<meta name="description" content="A traditional tree view using TreeLayout with tri-state checkboxes showing partially checked subtrees." />
<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">
// This button assumes data binding to the "checked" property.
go.GraphObject.defineBuilder("TriStateCheckBoxButton", function(args) {
var button = /** @type {Panel} */ (
go.GraphObject.make("Button",
{
"ButtonBorder.fill": "white",
width: 14,
height: 14
},
go.GraphObject.make(go.Shape,
{
name: "ButtonIcon",
geometryString: 'M0 0 M0 8.85 L4.9 13.75 16.2 2.45 M16.2 16.2', // a 'check' mark
strokeWidth: 2,
stretch: go.GraphObject.Fill, // this Shape expands to fill the Button
geometryStretch: go.GraphObject.Uniform, // the check mark fills the Shape without distortion
background: null,
visible: false // visible set to false: not checked, unless data.checked is true
},
new go.Binding("visible", "checked", function(p) { return p === true || p === null; }),
new go.Binding("stroke", "checked", function(p) { return p === null ? null : "black"; }),
new go.Binding("background", "checked", function(p) { return p === null ? "gray" : null; })
)
)
);
function updateCheckBoxesDown(node, val) {
node.diagram.model.setDataProperty(node.data, "checked", val);
node.findTreeChildrenNodes().each(function(child) { updateCheckBoxesDown(child, val); })
}
function updateCheckBoxesUp(node) {
var parent = node.findTreeParentNode();
if (parent !== null) {
var anychecked = parent.findTreeChildrenNodes().any(function(n) { return n.data.checked !== false && n.data.checked !== undefined; });
var allchecked = parent.findTreeChildrenNodes().all(function(n) { return n.data.checked === true; });
node.diagram.model.setDataProperty(parent.data, "checked", (allchecked ? true : (anychecked ? null : false)));
updateCheckBoxesUp(parent);
}
}
button.click = function(e, button) {
if (!button.isEnabledObject()) return;
var diagram = e.diagram;
if (diagram === null || diagram.isReadOnly) return;
if (diagram.model.isReadOnly) return;
e.handled = true;
var shape = button.findObject("ButtonIcon");
diagram.startTransaction("checkbox");
// Assume the name of the data property is "checked".
var node = button.part;
var oldval = node.data.checked;
var newval = (oldval !== true); // newval will always be either true or false, never null
// Set this data.checked property and those of all its children to the same value
updateCheckBoxesDown(node, newval);
// Walk up the tree and update all of their checkboxes
updateCheckBoxesUp(node);
// support extra side-effects without clobbering the click event handler:
if (typeof button["_doClick"] === "function") button["_doClick"](e, button);
diagram.commitTransaction("checkbox");
};
return button;
});
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",
{
width: 14,
"ButtonBorder.fill": "whitesmoke",
"ButtonBorder.stroke": "lightgray",
"_buttonFillOver": "rgba(0,128,255,0.25)",
"_buttonStrokeOver": null,
"_buttonFillPressed": "rgba(0,128,255,0.4)"
}),
$(go.Panel, "Horizontal",
{ position: new go.Point(16, 0), margin: new go.Margin(0, 2, 0, 0), defaultAlignment: go.Spot.Center },
new go.Binding("background", "isSelected", function(s) { return (s ? "lightblue" : "white"); }).ofObject(),
$("TriStateCheckBoxButton"),
$(go.TextBlock,
{ font: '9pt Verdana, sans-serif', margin: new go.Margin(0, 0, 0, 2) },
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 = 25;
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;
}
</script>
</head>
<body onload="init()">
<div id="sample">
<div id="myDiagramDiv" style="border: 1px solid black; width: 400px; height: 500px"></div>
<p>
This sample is derived from the <a href="treeView.html" target="_blank">Tree View</a> sample.
It adds the definition of the "TriStateCheckBoxButton" which is defined only to be used in a tree.
</p>
</div>
</body>
</html>