gojs
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Interactive diagrams, charts, and graphs, such as trees, flowcharts, orgcharts, UML, BPMN, or business diagrams
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HTML
<html lang="en">
<head>
<meta charset="utf-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no, viewport-fit=cover"/>
<meta name="description" content="Drag an item from a node out of the diagram and onto another HTML element."/>
<link rel="stylesheet" href="../assets/css/style.css"/>
<!-- Copyright 1998-2023 by Northwoods Software Corporation. -->
<title>Dragging a Field from a Record onto an HTML Element</title>
</head>
<body>
<!-- This top nav is not part of the sample code -->
<nav id="navTop" class="w-full z-30 top-0 text-white bg-nwoods-primary">
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<h1 class="my-0 p-1 ">GoJS</h1>
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<!-- Start of GoJS sample code -->
<script src="../release/go.js"></script>
<div id="allSampleContent" class="p-4 w-full">
<script id="code">
// Custom DraggingTool for dragging fields instead of whole Parts.
// FieldDraggingTool.fieldTemplate needs to be set to a template of the field that you want shown while dragging.
class FieldDraggingTool extends go.DraggingTool {
constructor() {
super();
this.fieldTemplate = null; // THIS NEEDS TO BE SET before a drag starts
this.temporaryPart = null;
this.temporaryImage = null;
}
// override this method
findDraggablePart() {
const diagram = this.diagram;
let obj = diagram.findObjectAt(diagram.lastInput.documentPoint);
while (obj !== null && obj.type !== go.Panel.TableRow) obj = obj.panel;
if (obj !== null && obj.type === go.Panel.TableRow &&
this.fieldTemplate !== null && this.temporaryPart === null) {
const tempPart =
go.GraphObject.make(go.Node, "Table",
{ layerName: "Tool", locationSpot: go.Spot.Bottom },
this.fieldTemplate.copy()); // copy the template!
this.temporaryPart = tempPart;
// assume OBJ is now a Panel representing a field, bound to field data
// update the temporary Part via data binding
tempPart.location = diagram.lastInput.documentPoint; // need to set location explicitly
diagram.add(tempPart); // add to Diagram before setting data
tempPart.data = obj.data; // bind to the same field data as being dragged
return tempPart;
}
return super.findDraggablePart();
}
doActivate() {
if (this.temporaryPart === null) return super.doActivate();
const diagram = this.diagram;
this.standardMouseSelect();
this.isActive = true;
// instead of the usual result of computeEffectiveCollection, just use the temporaryPart alone
const map = new go.Map(/*go.Part, go.DraggingInfo*/);
map.set(this.temporaryPart, new go.DraggingInfo(diagram.lastInput.documentPoint.copy()));
this.draggedParts = map;
this.startTransaction("Drag Field");
diagram.isMouseCaptured = true;
}
doDeactivate() {
if (this.temporaryPart === null) return super.doDeactivate();
const diagram = this.diagram;
// make sure the temporary Part is no longer in the Diagram
diagram.remove(this.temporaryPart);
this.temporaryPart = null;
if (this.temporaryImage !== null) {
document.body.removeChild(this.temporaryImage);
this.temporaryImage = null;
}
// now do all the standard deactivation cleanup,
// including setting isActive = false, clearing out draggedParts, calling stopTransaction(),
// and setting diagram.isMouseCaptured = false
super.doDeactivate();
}
makeImage() {
if (this.temporaryPart === null) return null;
const parts = new go.List();
parts.add(this.temporaryPart);
return this.diagram.makeImage({
parts: parts,
showTemporary: true,
callback: img => {
this.temporaryImage = img;
img.style.position = "absolute";
img.style.pointerEvents = "none";
img.style.zIndex = 999;
document.body.appendChild(img);
this.temporaryPart.opacity = 0;
}
});
}
doMouseMove() {
if (!this.isActive) return;
if (this.temporaryPart === null) return super.doMouseMove();
const diagram = this.diagram;
// just move the temporaryPart (in draggedParts), without regard to moving or copying permissions of the Node
const offset = diagram.lastInput.documentPoint.copy().subtract(diagram.firstInput.documentPoint);
this.moveParts(this.draggedParts, offset, false);
if (diagram.viewportBounds.containsPoint(diagram.lastInput.documentPoint)) {
if (this.temporaryPart.opacity != 1) {
this.temporaryPart.opacity = 1;
if (this.temporaryImage !== null) {
document.body.removeChild(this.temporaryImage);
this.temporaryImage = null;
}
}
} else {
if (this.temporaryPart.opacity === 1) {
this.makeImage(); // also sets temporaryPart.opacity = 0
}
// move a temporary Image element instead
const img = this.temporaryImage;
if (img !== null) {
const e = diagram.lastInput.event;
img.style.left = (window.scrollX + e.clientX - img.width/2) + "px";
img.style.top = (window.scrollY + e.clientY - img.height/2) + "px";
// position the Image to be just above the mouse pointer
}
}
}
doMouseUp() {
if (!this.isActive) return;
if (this.temporaryPart === null) return super.doMouseUp();
const diagram = this.diagram;
const data = this.temporaryPart.data;
const input = diagram.lastInput;
let id = input.event.target.id;
if (input.isTouchEvent) {
// Touch events always target the first object touched, we want the last.
// Determine if you are using Touch or Pointer:
const evt = input.event.changedTouches ? input.event.changedTouches[0] : input.event;
id = document.elementFromPoint(evt.clientX, evt.clientY).id;
}
if (input.event && id === "myDroppedFields") {
document.getElementById("myDroppedFields").textContent += data.name + " (" + data.info + ")\n";
}
this.transactionResult = "Dragged Field";
this.stopTool();
}
}
// end of FieldDraggingTool
function init() {
// Since 2.2 you can also author concise templates with method chaining instead of GraphObject.make
// For details, see https://gojs.net/latest/intro/buildingObjects.html
const $ = go.GraphObject.make; // for conciseness in defining templates
myDiagram =
new go.Diagram("myDiagramDiv",
{
validCycle: go.Diagram.CycleNotDirected, // don't allow loops
draggingTool: $(FieldDraggingTool), // use custom DraggingTool
"undoManager.isEnabled": true
});
// This template is a Panel that is used to represent each item in a Panel.itemArray.
// The Panel is data bound to the item object.
const fieldTemplate =
$(go.Panel, "TableRow", // this Panel is a row in the containing Table
new go.Binding("portId", "name"), // this Panel is a "port"
{
background: "transparent", // so this port's background can be picked by the mouse
fromSpot: go.Spot.Right, // links only go from the right side to the left side
toSpot: go.Spot.Left
}, // allow drawing links from or to this port
$(go.Shape,
{ width: 12, height: 12, column: 0, strokeWidth: 2, margin: 4 },
new go.Binding("figure", "figure"),
new go.Binding("fill", "color")),
$(go.TextBlock,
{ margin: new go.Margin(0, 2), column: 1, font: "bold 13px sans-serif" },
new go.Binding("text", "name")),
$(go.TextBlock,
{ margin: new go.Margin(0, 2), column: 2, font: "13px sans-serif" },
new go.Binding("text", "info"))
);
// the FieldDraggingTool needs a template for what to show while dragging
myDiagram.toolManager.draggingTool.fieldTemplate = fieldTemplate;
// This template represents a whole "record".
myDiagram.nodeTemplate =
$(go.Node, "Auto",
new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
// this rectangular shape surrounds the content of the node
$(go.Shape,
{ fill: "#EEEEEE" }),
// the content consists of a header and a list of items
$(go.Panel, "Vertical",
// this is the header for the whole node
$(go.Panel, "Auto",
{ stretch: go.GraphObject.Horizontal }, // as wide as the whole node
$(go.Shape,
{ fill: "#1570A6", stroke: null }),
$(go.TextBlock,
{
alignment: go.Spot.Center,
margin: 3,
stroke: "white",
textAlign: "center",
font: "bold 12pt sans-serif"
},
new go.Binding("text", "key"))),
// this Panel holds a Panel for each item object in the itemArray;
// each item Panel is defined by the itemTemplate to be a TableRow in this Table
$(go.Panel, "Table",
{
name: "TABLE",
padding: 2,
minSize: new go.Size(100, 10),
defaultStretch: go.GraphObject.Horizontal,
itemTemplate: fieldTemplate
},
new go.Binding("itemArray", "fields")
) // end Table Panel of items
) // end Vertical Panel
); // end Node
myDiagram.model =
new go.GraphLinksModel(
{
linkFromPortIdProperty: "fromPort",
linkToPortIdProperty: "toPort",
copiesArrays: true,
copiesArrayObjects: true,
nodeDataArray: [
{
key: "Record1",
fields: [
{ name: "field1", info: "", color: "#F7B84B", figure: "Ellipse" },
{ name: "field2", info: "the second one", color: "#F25022", figure: "Ellipse" },
{ name: "fieldThree", info: "3rd", color: "#00BCF2" }
],
loc: "0 0"
},
{
key: "Record2",
fields: [
{ name: "fieldA", info: "", color: "#FFB900", figure: "Diamond", info: "diamond" },
{ name: "fieldB", info: "", color: "green", figure: "Circle", info: "circle" },
{ name: "fieldC", info: "", color: "red", figure: "Triangle", info: "triangle" },
{ name: "fieldD", info: "", figure: "XLine", info: "X" }
],
loc: "250 0"
}
]
});
}
window.addEventListener('DOMContentLoaded', init);
</script>
<div id="sample">
<div id="myDiagramDiv" style="border: solid 1px black; width:100%; height:300px"></div>
<p>Drag a field from one of the record nodes and drop onto the PRE element below.</p>
<p>Here you can drop a field from one of the records above:</p>
<pre id="myDroppedFields" style="padding:5px;width:200px;height:300px;border:dashed;font:bold 11pt sans-serif"></pre>
</div>
</div>
<!-- * * * * * * * * * * * * * -->
<!-- End of GoJS sample code -->
</div>
</body>
<!-- This script is part of the gojs.net website, and is not needed to run the sample -->
<script src="../assets/js/goSamples.js"></script>
</html>