Custom Nodes

Creating your own nodes is as easy as creating a regular React component and passing them to nodeTypes. Being just regular components, you can essentially display any content and implement any functionality you like. Inside, you have access to a number of props that let you implement and extend default node behavior.

import React, { useState, useEffect, useCallback } from 'react';
import {
  ReactFlow,
  useNodesState,
  useEdgesState,
  addEdge,
  MiniMap,
  Controls,
} from '@xyflow/react';
 
import '@xyflow/react/dist/style.css';
 
 
import ColorSelectorNode from './ColorSelectorNode';
 
const initBgColor = '#c9f1dd';
 
const snapGrid = [20, 20];
const nodeTypes = {
  selectorNode: ColorSelectorNode,
};
 
const defaultViewport = { x: 0, y: 0, zoom: 1.5 };
 
const CustomNodeFlow = () => {
  const [nodes, setNodes, onNodesChange] = useNodesState([]);
  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
  const [bgColor, setBgColor] = useState(initBgColor);
 
  useEffect(() => {
    const onChange = (event) => {
      setNodes((nds) =>
        nds.map((node) => {
          if (node.id !== '2') {
            return node;
          }
 
          const color = event.target.value;
 
          setBgColor(color);
 
          return {
            ...node,
            data: {
              ...node.data,
              color,
            },
          };
        }),
      );
    };
 
    setNodes([
      {
        id: '1',
        type: 'input',
        data: { label: 'An input node' },
        position: { x: 0, y: 50 },
        sourcePosition: 'right',
      },
      {
        id: '2',
        type: 'selectorNode',
        data: { onChange: onChange, color: initBgColor },
        position: { x: 300, y: 50 },
      },
      {
        id: '3',
        type: 'output',
        data: { label: 'Output A' },
        position: { x: 650, y: 25 },
        targetPosition: 'left',
      },
      {
        id: '4',
        type: 'output',
        data: { label: 'Output B' },
        position: { x: 650, y: 100 },
        targetPosition: 'left',
      },
    ]);
 
    setEdges([
      {
        id: 'e1-2',
        source: '1',
        target: '2',
        animated: true,
      },
      {
        id: 'e2a-3',
        source: '2',
        target: '3',
        sourceHandle: 'a',
        animated: true,
      },
      {
        id: 'e2b-4',
        source: '2',
        target: '4',
        sourceHandle: 'b',
        animated: true,
      },
    ]);
  }, []);
 
  const onConnect = useCallback(
    (params) =>
      setEdges((eds) =>
        addEdge({ ...params, animated: true }, eds),
      ),
    [],
  );
  return (
    <ReactFlow
      nodes={nodes}
      edges={edges}
      onNodesChange={onNodesChange}
      onEdgesChange={onEdgesChange}
      onConnect={onConnect}
      style={{ background: bgColor }}
      nodeTypes={nodeTypes}
      snapToGrid={true}
      snapGrid={snapGrid}
      defaultViewport={defaultViewport}
      fitView
      attributionPosition="bottom-left"
    >
      <MiniMap
        nodeStrokeColor={(n) => {
          if (n.type === 'input') return '#0041d0';
          if (n.type === 'selectorNode') return bgColor;
          if (n.type === 'output') return '#ff0072';
        }}
        nodeColor={(n) => {
          if (n.type === 'selectorNode') return bgColor;
          return '#fff';
        }}
      />
      <Controls />
    </ReactFlow>
  );
};
 
export default CustomNodeFlow;