Validation Source Code
index.js
import React, { useState } from 'react';
import ReactFlow, { addEdge, Handle } from 'react-flow-renderer';
import './validation.css';
const initialElements = [
{ id: '0', type: 'custominput', position: { x: 0, y: 150 } },
{ id: 'A', type: 'customnode', position: { x: 250, y: 0 } },
{ id: 'B', type: 'customnode', position: { x: 250, y: 150 } },
{ id: 'C', type: 'customnode', position: { x: 250, y: 300 } },
];
const onLoad = (reactFlowInstance) => reactFlowInstance.fitView();
const isValidConnection = (connection) => connection.target === 'B';
const onConnectStart = (event, { nodeId, handleType }) => console.log('on connect start', { nodeId, handleType });
const onConnectStop = (event) => console.log('on connect stop', event);
const onConnectEnd = (event) => console.log('on connect end', event);
const CustomInput = () => (
<>
<div>Only connectable with B</div>
<Handle type="source" position="right" isValidConnection={isValidConnection} />
</>
);
const CustomNode = ({ id }) => (
<>
<Handle type="target" position="left" isValidConnection={isValidConnection} />
<div>{id}</div>
<Handle type="source" position="right" isValidConnection={isValidConnection} />
</>
);
const nodeTypes = {
custominput: CustomInput,
customnode: CustomNode,
};
const HorizontalFlow = () => {
const [elements, setElements] = useState(initialElements);
const onConnect = (params) => {
console.log('on connect', params);
setElements((els) => addEdge(params, els));
};
return (
<ReactFlow
elements={elements}
onConnect={onConnect}
selectNodesOnDrag={false}
onLoad={onLoad}
className="validationflow"
nodeTypes={nodeTypes}
onConnectStart={onConnectStart}
onConnectStop={onConnectStop}
onConnectEnd={onConnectEnd}
/>
);
};
export default HorizontalFlow;