Connection Limit

This is an example of a custom node with a custom handle that can limit the amount of connections a handle can have using the isConnectable prop. You can use a boolean, a number (the number of max. connections the handle should have) or a callback function that returns a boolean as an arg for the isConnectable prop of the CustomHandle component.

import { useCallback } from 'react';
import {
  Background,
  ReactFlow,
  addEdge,
  Position,
  useNodesState,
  useEdgesState,
} from '@xyflow/react';
 
import '@xyflow/react/dist/style.css';
 
 
import CustomNode from './CustomNode';
 
const nodeTypes = {
  custom: CustomNode,
};
 
const CustomNodeFlow = () => {
  const [nodes, setNodes, onNodesChange] = useNodesState([
    {
      id: '1',
      type: 'input',
      data: { label: 'Node 1' },
      position: { x: 0, y: 25 },
      sourcePosition: Position.Right,
    },
    {
      id: '2',
      type: 'custom',
      data: {},
      position: { x: 250, y: 50 },
    },
    {
      id: '3',
      type: 'input',
      data: { label: 'Node 2' },
      position: { x: 0, y: 100 },
      sourcePosition: Position.Right,
    },
  ]);
  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
 
  const onConnect = useCallback(
    (params) => setEdges((eds) => addEdge(params, eds)),
    [setEdges],
  );
 
  return (
    <ReactFlow
      nodes={nodes}
      edges={edges}
      onNodesChange={onNodesChange}
      onEdgesChange={onEdgesChange}
      onConnect={onConnect}
      nodeTypes={nodeTypes}
      fitView
      style={{ backgroundColor: "#F7F9FB" }}
      >
      <Background />
    </ReactFlow>
  );
};
 
export default CustomNodeFlow;

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