Base Style

React Flow comes with a default style and a base style. This example shows how the base style looks. The base style is mandatory for every flow to work. You can find more information in the theming guide.

import React, { useCallback } from 'react';
import {
  ReactFlow,
  Background,
  Controls,
  MiniMap,
  useNodesState,
  useEdgesState,
  addEdge,
  Position,
} from '@xyflow/react';
 
import '@xyflow/react/dist/base.css';
 
const nodeDefaults = {
  sourcePosition: Position.Right,
  targetPosition: Position.Left,
};
 
const initialNodes = [
  {
    id: '1',
    position: { x: 0, y: 150 },
    data: { label: 'base style 1' },
    ...nodeDefaults,
  },
  {
    id: '2',
    position: { x: 250, y: 0 },
    data: { label: 'base style 2' },
    ...nodeDefaults,
  },
  {
    id: '3',
    position: { x: 250, y: 150 },
    data: { label: 'base style 3' },
    ...nodeDefaults,
  },
  {
    id: '4',
    position: { x: 250, y: 300 },
    data: { label: 'base style 4' },
    ...nodeDefaults,
  },
];
 
const initialEdges = [
  {
    id: 'e1-2',
    source: '1',
    target: '2',
  },
  {
    id: 'e1-3',
    source: '1',
    target: '3',
  },
  {
    id: 'e1-4',
    source: '1',
    target: '4',
  },
];
 
const Flow = () => {
  const [nodes, setNodes, onNodesChange] = useNodesState(initialNodes);
  const [edges, setEdges, onEdgesChange] = useEdgesState(initialEdges);
 
  const onConnect = useCallback(
    (params) => setEdges((els) => addEdge(params, els)),
    [],
  );
 
  return (
    <ReactFlow
      nodes={nodes}
      edges={edges}
      onNodesChange={onNodesChange}
      onEdgesChange={onEdgesChange}
      onConnect={onConnect}
      fitView
    >
      <Background />
      <Controls />
      <MiniMap />
    </ReactFlow>
  );
};
 
export default Flow;

Context Menu