addEdge()

Source on GitHub

This util is a convenience function to add a new Edge to an array of edges. It also performs some validation to make sure you don’t add an invalid edge or duplicate an existing one.


import { useCallback } from 'react';
import {
  ReactFlow,
  addEdge,
  useNodesState,
  useEdgesState,
} from '@xyflow/react';
 
export default function Flow() {
  const [nodes, setNodes, onNodesChange] = useNodesState([]);
  const [edges, setEdges, onEdgesChange] = useEdgesState([]);
  const onConnect = useCallback(
    (connection) => {
      setEdges((oldEdges) => addEdge(connection, oldEdges));
    },
    [setEdges],
  );
 
  return <ReactFlow nodes={nodes} edges={edges} onConnect={onConnect} />;
}

Signature

Notes

If an edge with the same target and source already exists (and the same targetHandle and sourceHandle if those are set), then this util won’t add a new edge even if the id property is different.