neo4j-nvl-skill

npm install @neo4j-nvl/base                  # core (required)
npm install @neo4j-nvl/interaction-handlers  # standard interactions (optional, vanilla JS)
npm install @neo4j-nvl/react                 # React wrappers (optional)

const nvl = new NVL(container, nodes, rels, { renderer: 'webgl' })
nvl.setRenderer('canvas')   // swap at runtime

<!-- ❌ height defaults to 0; graph invisible -->
<div id="viz"></div>

<!-- ✅ explicit dimensions -->
<div id="viz" style="width: 100%; height: 600px;"></div>

import { NVL } from '@neo4j-nvl/base'

const container = document.getElementById('viz')
const nodes = [{ id: '1' }, { id: '2' }]
const relationships = [{ id: '12', from: '1', to: '2', type: 'KNOWS' }]

const nvl = new NVL(container, nodes, relationships)

import { NVL } from '@neo4j-nvl/base'

const options = {
  initialZoom: 1.0,
  minZoom: 0.1,
  maxZoom: 8,
  layout: 'forceDirected',
  renderer: 'canvas',
  styling: { defaultNodeColor: '#0e86d4', defaultRelationshipColor: '#888' }
}
const callbacks = {
  onInitialization: () => console.log('NVL ready'),
  onLayoutDone: () => nvl.fit([]),
  onError: (err) => console.error('NVL error', err)
}

const nvl = new NVL(container, nodes, relationships, options, callbacks)

// On teardown — always:
nvl.destroy()

import { NVL } from '@neo4j-nvl/base'
import {
  ZoomInteraction, PanInteraction, DragNodeInteraction,
  ClickInteraction, HoverInteraction, BoxSelectInteraction,
  LassoInteraction, KeyboardInteraction
} from '@neo4j-nvl/interaction-handlers'

const nvl = new NVL(container, nodes, relationships)

const zoom  = new ZoomInteraction(nvl)
const pan   = new PanInteraction(nvl)
const drag  = new DragNodeInteraction(nvl)
const click = new ClickInteraction(nvl, { selectOnClick: true })
const hover = new HoverInteraction(nvl, { drawShadowOnHover: true })

click.updateCallback('onNodeClick',         (node, hits, evt) => console.log('node',  node.id))
click.updateCallback('onRelationshipClick', (rel,  hits, evt) => console.log('rel',   rel.id))
click.updateCallback('onCanvasClick',       (evt)             => console.log('canvas'))
hover.updateCallback('onHover',             (el, hits, evt)   => el && console.log('over', el.id))
drag.updateCallback('onDragEnd',            (nodes, evt)      => savePositions(nodes))
zoom.updateCallback('onZoom',               (level)           => console.log('zoom', level))

// Teardown — destroy all handlers, then the NVL instance
function teardown() {
  for (const h of [zoom, pan, drag, click, hover]) h.destroy()
  nvl.destroy()
}

import { InteractiveNvlWrapper } from '@neo4j-nvl/react'
import type { MouseEventCallbacks, NvlOptions } from '@neo4j-nvl/react'
import { useRef } from 'react'
import type { NVL } from '@neo4j-nvl/base'

export function GraphView({ nodes, rels }) {
  const nvlRef = useRef<NVL>(null)

  const nvlOptions: NvlOptions = { initialZoom: 1, renderer: 'canvas' }

  const mouseEventCallbacks: MouseEventCallbacks = {
    onNodeClick:         (node, hits, evt) => console.log('node',  node.id),
    onRelationshipClick: (rel,  hits, evt) => console.log('rel',   rel.id),
    onCanvasClick:       (evt)             => console.log('canvas'),
    onHover:             (el, hits, evt)   => el && console.log('hover', el.id),
    onDragEnd:           (nodes, evt)      => persist(nodes),
    onZoom: true,                                       // enable, no callback
    onPan:  true
  }

  return (
    <div style={{ width: '100%', height: 600 }}>
      <InteractiveNvlWrapper
        ref={nvlRef}
        nodes={nodes}
        rels={rels}
        nvlOptions={nvlOptions}
        interactionOptions={{ selectOnClick: true, drawShadowOnHover: true }}
        mouseEventCallbacks={mouseEventCallbacks}
        onInitializationError={(err) => console.error('NVL init', err)}
      />
    </div>
  )
}

import { BasicNvlWrapper } from '@neo4j-nvl/react'
import type { NVL } from '@neo4j-nvl/base'
import { useRef } from 'react'

export function MiniGraph({ nodes, rels }) {
  const nvlRef = useRef<NVL>(null)

  return (
    <div style={{ width: '100%', height: 400 }}>
      <BasicNvlWrapper
        ref={nvlRef}
        nodes={nodes}
        rels={rels}
        nvlOptions={{ initialZoom: 2 }}
        nvlCallbacks={{ onLayoutDone: () => nvlRef.current?.fit([]) }}
      />
      <button onClick={() => nvlRef.current?.fit(['1', '2'])}>Zoom to 1,2</button>
    </div>
  )
}

import neo4j from 'neo4j-driver'
import { NVL, nvlResultTransformer } from '@neo4j-nvl/base'

const driver = neo4j.driver(process.env.NEO4J_URI,
  neo4j.auth.basic(process.env.NEO4J_USERNAME, process.env.NEO4J_PASSWORD))

const { nodes, relationships } = await driver.executeQuery(
  'MATCH (a)-[r]-(b) RETURN a, r, b LIMIT 25',
  {},
  { database: 'neo4j', resultTransformer: nvlResultTransformer }
)

const nvl = new NVL(document.getElementById('viz'), nodes, relationships)

// ❌ raw EagerResult — records are not Node/Relationship objects
const result = await driver.executeQuery('MATCH (a)-[r]-(b) RETURN a, r, b')
new NVL(container, result.records, [])   // breaks

// ✅ use the transformer
const { nodes, relationships } = await driver.executeQuery(
  'MATCH (a)-[r]-(b) RETURN a, r, b',
  {},
  { database: 'neo4j', resultTransformer: nvlResultTransformer }
)
new NVL(container, nodes, relationships)

nvl.updateElementsInGraph(
  [{ id: '1', color: '#f00', selected: true }],   // PartialNode
  [{ id: '12', width: 4 }]                         // PartialRelationship
)

const nvl = new NVL(container, nodes, rels)

container.addEventListener('click', (evt) => {
  const { nvlTargets } = nvl.getHits(evt, ['node', 'relationship'], { hitNodeMarginWidth: 4 })
  const hitNode = nvlTargets.nodes[0]
  const hitRel  = nvlTargets.relationships[0]
  if (hitNode) console.log('hit node', hitNode.data.id)
  else if (hitRel) console.log('hit rel', hitRel.data.id)
  else console.log('hit canvas')
})