/ Miscellaneous

A library for creating directed graph editors

A library for creating directed graph editors

react-digraph

A React component which makes it easy to create a directed graph editor without implementing any of the SVG drawing or event handling logic.

react-digraph

Important v5.0.0 Information

Version 5.0.0 is a breaking change to some of the API interfaces. Many of the component attributes are the same, and the data format is the same, but there
have been some necessary changes to improve the API and make the component faster and add new features. These changes will be listed below in the deprecation notes section.

Installation

npm install --save react-digraph

Usage

The default export is a component called 'GraphView'; it provides a multitude of hooks for various graph editing operations and a set of controls for zooming. Typically, it should be wrapped in a higher order component that supplies various callbacks (onCreateNode, onCreateEdge etc...).

All nodes and edges can have a type attribute set - nodes also support a subtype attribute. These can be passed to GraphView via the nodeTypes, nodeSubtypes, and edgeTypes props. GraphView will look up the corresponding SVG elements for the node's type/subtype and the edge's type and draw it accordingly.

It is often convenient to combine these types into a configuration object that can be referred to elsewhere in the application and used to associate events fired from nodes/edges in the graphView with other actions in the application. Here is an abbreviated example:

import GraphView from 'react-digraph'

const GraphConfig =  {
  NodeTypes: {
    empty: { // required to show empty nodes
      typeText: "None",
      shapeId: "#empty",
      shape: (
        <symbol viewBox="0 0 100 100" id="empty" key="0">
          <circle cx="50" cy="50" r="45"></circle>
        </symbol>
      )
    }
  },
  NodeSubtypes: {},
  EdgeTypes: {
    emptyEdge: {  // required to show empty edges
      shapeId: "#emptyEdge",
      shape: (
        <symbol viewBox="0 0 50 50" id="emptyEdge" key="0">
          <circle cx="25" cy="25" r="8" fill="currentColor"> </circle>
        </symbol>
      )
    }
  }
}

const NODE_KEY = "id"       // Allows D3 to correctly update DOM

class Graph extends Component {

  constructor(props) {
    super(props);

    this.state = {
      graph: sample,
      selected: {}
    }
  }

  /* Define custom graph editing methods here */

  render() {
    const nodes = this.state.graph.nodes;
    const edges = this.state.graph.edges;
    const selected = this.state.selected;

    const NodeTypes = GraphConfig.NodeTypes;
    const NodeSubtypes = GraphConfig.NodeSubtypes;
    const EdgeTypes = GraphConfig.EdgeTypes;

    return (
      <div id='graph' style={styles.graph}>

        <GraphView  ref='GraphView'
                    nodeKey={NODE_KEY}
                    nodes={nodes}
                    edges={edges}
                    selected={selected}
                    nodeTypes={NodeTypes}
                    nodeSubtypes={NodeSubtypes}
                    edgeTypes={EdgeTypes}
                    onSelectNode={this.onSelectNode}
                    onCreateNode={this.onCreateNode}
                    onUpdateNode={this.onUpdateNode}
                    onDeleteNode={this.onDeleteNode}
                    onSelectEdge={this.onSelectEdge}
                    onCreateEdge={this.onCreateEdge}
                    onSwapEdge={this.onSwapEdge}
                    onDeleteEdge={this.onDeleteEdge}/>
      </div>
    );
  }

}

A typical graph that would be stored in the Graph component's state looks something like this:

{
  "nodes": [
    {
      "id": 1,
      "title": "Node A",
      "x": 258.3976135253906,
      "y": 331.9783248901367,
      "type": "empty"
    },
    {
      "id": 2,
      "title": "Node B",
      "x": 593.9393920898438,
      "y": 260.6060791015625,
      "type": "empty"
    },
    {
      "id": 3,
      "title": "Node C",
      "x": 237.5757598876953,
      "y": 61.81818389892578,
      "type": "empty"
    },
    {
      "id": 4,
      "title": "Node C",
      "x": 600.5757598876953,
      "y": 600.81818389892578,
      "type": "empty"
    }
  ],
  "edges": [
    {
      "source": 1,
      "target": 2,
      "type": "emptyEdge"
    },
    {
      "source": 2,
      "target": 4,
      "type": "emptyEdge"
    }
  ]
}

For a detailed example, check out src/examples/graph.js.
To run the example:

npm install
npm run serve

A webpage will open in your default browser automatically.

  • To add nodes, hold shift and click on the grid.
  • To add edges, hold shift and click/drag to between nodes.
  • To delete a node or edge, click on it and press delete.
  • Click and drag nodes to change their position.

All props are detailed below.

Props

Prop Type Required Notes
nodeKey string true Key for D3 to update nodes(typ. UUID).
nodes array true Array of graph nodes.
edges array true Array of graph edges.
selected object true The currently selected graph entity.
nodeTypes object true Config object of available node types.
nodeSubtypes object true Config object of available node subtypes.
edgeTypes object true Config object of available edge types.
onSelectNode func true Called when a node is selected.
onCreateNode func true Called when a node is created.
onUpdateNode func true Called when a node is moved.
onDeleteNode func true Called when a node is deleted.
onSelectEdge func true Called when an edge is selected.
onCreateEdge func true Called when an edge is created.
onSwapEdge func true Called when an edge 'target' is swapped.
onDeleteEdge func true Called when an edge is deleted.
canDeleteNode func false Called before a node is deleted.
canCreateEdge func false Called before an edge is created.
canDeleteEdge func false Called before an edge is deleted.
renderNode func false Called to render node geometry.
renderNodeText func false Called to render the node text
renderDefs func false Called to render svg definitions.
renderBackground func false Called to render svg background.
readOnly bool false Disables all graph editing interactions.
maxTitleChars number false Truncates node title characters.
gridSize number false Overall grid size.
gridSpacing number false Grid spacing.
gridDotSize number false Grid dot size.
minZoom number false Minimum zoom percentage.
maxZoom number false Maximum zoom percentage.
nodeSize number false Node bbox size.
edgeHandleSize number false Edge handle size.
edgeArrowSize number false Edge arrow size.
zoomDelay number false Delay before zoom occurs.
zoomDur number false Duration of zoom transition.
showGraphControls boolean false Whether to show zoom controls.
layoutEngineType typeof LayoutEngineType false Uses a pre-programmed layout engine, such as 'SnapToGrid'

Prop Types:

  nodes: any[];
  edges: any[];
  minZoom?: number;
  maxZoom?: number;
  readOnly?: boolean;
  maxTitleChars?: number;
  nodeSize?: number;
  edgeHandleSize?: number;
  edgeArrowSize?: number;
  zoomDelay?: number;
  zoomDur?: number;
  showGraphControls?: boolean;
  nodeKey: string;
  gridSize?: number;
  gridSpacing?: number;
  gridDotSize?: number;
  backgroundFillId?: string;
  nodeTypes: any;
  nodeSubtypes: any;
  edgeTypes: any;
  selected: any;
  onDeleteNode: (selected: any, originalArrIndex: number, nodes: any[]) => void;
  onSelectNode: (node: INode | null) => void;
  onCreateNode: (x: number, y: number) => void;
  onCreateEdge: (sourceNode: INode, targetNode: INode) => void;
  onDeleteEdge: (selectedEdge: IEdge, index: number, edges: IEdge[]) => void;
  onUpdateNode: (node: INode) => void;
  onSwapEdge: (sourceNode: INode, targetNode: INode, edge: IEdge) => void;
  onSelectEdge: (selectedEdge: IEdge) => void;
  canDeleteNode?: (selected: any) => boolean;
  canDeleteEdge?: (selected: any) => boolean;
  canCreateEdge?: () => boolean;
  onUndo?: () => void;
  onCopySelected?: () => void;
  onPasteSelected?: () => void;
  renderBackground?: (gridSize?: number) => any;
  renderDefs?: () => any;
  renderNode?: (
    nodeRef: any,
    data: any,
    index: number,
    selected: boolean,
    hovered: boolean
  ) => any;
  renderNodeText?: (data: any, index: number, id: string | number, isSelected: boolean) => any;
  layoutEngineType?: LayoutEngineType;

Notes

  • To run the tests, you'll need to be using at least node v4.0 (for jsDom). Run npm run test.

Deprecation Notes

Prop Type Required Notes
emptyType string true 'Default' node type.
getViewNode func true Node getter.
renderEdge func false Called to render edge geometry.
enableFocus bool false Adds a 'focus' toggle state to GraphView.
transitionTime number false Fade-in/Fade-out time.
primary string false Primary color.
light string false Light color.
dark string false Dark color.
style object false Style prop for wrapper.
gridDot number false Grid dot size.
graphControls boolean true Whether to show zoom controls.

GitHub