Connection Line

A Connection Line is what you see when you click and drag out from a handle. It represents a possible edge and can snap to valid handles in close proximity. You can implement your own Connection Line by passing a React component rendering the line. You can find the passed props in the custom connection line docs.

import React, { useCallback } from 'react';
import {
  ReactFlow,
  useNodesState,
  useEdgesState,
  addEdge,
  Background,
} from '@xyflow/react';
import '@xyflow/react/dist/style.css';
 
import CustomNode from './CustomNode';
import ConnectionLine from './ConnectionLine';
 
const initialNodes = [
  {
    id: 'connectionline-1',
    type: 'custom',
    data: { label: 'Node 1' },
    position: { x: 250, y: 5 },
  },
];
 
const nodeTypes = {
  custom: CustomNode,
};
 
const ConnectionLineFlow = () => {
  const [nodes, _, onNodesChange] = useNodesState(initialNodes);
  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
  const onConnect = useCallback(
    (params) => setEdges((eds) => addEdge(params, eds)),
    [],
  );
 
  return (
    <ReactFlow
      nodes={nodes}
      edges={edges}
      nodeTypes={nodeTypes}
      onNodesChange={onNodesChange}
      onEdgesChange={onEdgesChange}
      connectionLineComponent={ConnectionLine}
      onConnect={onConnect}
      fitView
      fitViewOptions={{
        padding: 0.2,
      }}
    >
      <Background variant="lines" />
    </ReactFlow>
  );
};
 
export default ConnectionLineFlow;

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