Horizontal Flow

A diagram can go from left to right or from top to bottom, but you can also create mixed ones. For controlling the direction of a diagram you can adjust the handle positions of a node with the sourcePosition and targetPosition props.

import React, { useCallback } from 'react';
import {
  Background,
  ReactFlow,
  useNodesState,
  useEdgesState,
  addEdge,
} from '@xyflow/react';
import '@xyflow/react/dist/style.css';
 
const initialNodes = [
  {
    id: 'horizontal-1',
    sourcePosition: 'right',
    type: 'input',
    data: { label: 'Input' },
    position: { x: 0, y: 80 },
  },
  {
    id: 'horizontal-2',
    sourcePosition: 'right',
    targetPosition: 'left',
    data: { label: 'A Node' },
    position: { x: 250, y: 0 },
  },
  {
    id: 'horizontal-3',
    sourcePosition: 'right',
    targetPosition: 'left',
    data: { label: 'Node 3' },
    position: { x: 250, y: 160 },
  },
  {
    id: 'horizontal-4',
    sourcePosition: 'right',
    targetPosition: 'left',
    data: { label: 'Node 4' },
    position: { x: 500, y: 0 },
  },
  {
    id: 'horizontal-5',
    sourcePosition: 'top',
    targetPosition: 'bottom',
    data: { label: 'Node 5' },
    position: { x: 500, y: 100 },
  },
  {
    id: 'horizontal-6',
    sourcePosition: 'bottom',
    targetPosition: 'top',
    data: { label: 'Node 6' },
    position: { x: 500, y: 230 },
  },
  {
    id: 'horizontal-7',
    sourcePosition: 'right',
    targetPosition: 'left',
    data: { label: 'Node 7' },
    position: { x: 750, y: 50 },
  },
  {
    id: 'horizontal-8',
    sourcePosition: 'right',
    targetPosition: 'left',
    data: { label: 'Node 8' },
    position: { x: 750, y: 300 },
  },
];
 
const initialEdges = [
  {
    id: 'horizontal-e1-2',
    source: 'horizontal-1',
    type: 'smoothstep',
    target: 'horizontal-2',
    animated: true,
  },
  {
    id: 'horizontal-e1-3',
    source: 'horizontal-1',
    type: 'smoothstep',
    target: 'horizontal-3',
    animated: true,
  },
  {
    id: 'horizontal-e1-4',
    source: 'horizontal-2',
    type: 'smoothstep',
    target: 'horizontal-4',
    label: 'edge label',
  },
  {
    id: 'horizontal-e3-5',
    source: 'horizontal-3',
    type: 'smoothstep',
    target: 'horizontal-5',
    animated: true,
  },
  {
    id: 'horizontal-e3-6',
    source: 'horizontal-3',
    type: 'smoothstep',
    target: 'horizontal-6',
    animated: true,
  },
  {
    id: 'horizontal-e5-7',
    source: 'horizontal-5',
    type: 'smoothstep',
    target: 'horizontal-7',
    animated: true,
  },
  {
    id: 'horizontal-e6-8',
    source: 'horizontal-6',
    type: 'smoothstep',
    target: 'horizontal-8',
    animated: true,
  },
];
 
const HorizontalFlow = () => {
  const [nodes, _, 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
      attributionPosition="bottom-left"
    >
      <Background />
    </ReactFlow>
  );
};
 
export default HorizontalFlow;