addEdge()

Source on GitHub (opens in a new tab)

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, { useNodesState, useEdgesState } from 'reactflow';
 
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

Name	Type
#Params
#`edge`	`Edge \| Connection`
#`edges`	`Edge[]`
#Returns
#	`Edge[]`

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.

Utils applyEdgeChanges()