Why js-cloudimage-hotspot?

Existing hotspot libraries are often heavy, inaccessible, or locked behind paid services. This library was built to fill the gap:

• Lightweight — under 15 KB gzipped with zero runtime dependencies
• Accessible by default — WCAG 2.1 AA compliant out of the box
• Framework-agnostic — works with vanilla JS, React, or any framework
• Built-in zoom & pan — no need for a separate zoom library
• Multi-image scenes — create virtual tours without extra tooling
• Optional Cloudimage CDN — serve optimally-sized images automatically

Features

• Hotspot markers — Positioned via percentage or pixel coordinates with pulsing animation
• Popover system — Hover, click, or load triggers with built-in flip/shift positioning
• Zoom & Pan — CSS transform-based with mouse wheel, pinch-to-zoom, double-click, drag-to-pan
• WCAG 2.1 AA — Full keyboard navigation, ARIA attributes, focus management, reduced motion
• CSS variable theming — Light and dark themes, fully customizable
• Two init methods — JavaScript API and HTML data-attributes
• React wrapper — Separate entry point with component, hook, and ref API
• TypeScript — Full type definitions
• Cloudimage CDN — Optional responsive image loading
• Multi-image scenes — Navigate between images with animated transitions

Installation

npm install js-cloudimage-hotspot

CDN

<script src="https://scaleflex.cloudimg.io/v7/plugins/js-cloudimage-hotspot/1.1.5/js-cloudimage-hotspot.min.js?vh=46c28d&func=proxy"></script>

Quick Start

JavaScript API

import CIHotspot from 'js-cloudimage-hotspot';

const viewer = new CIHotspot('#product-image', {
  src: 'https://example.com/living-room.jpg',
  alt: 'Modern living room',
  zoom: true,
  trigger: 'hover',
  hotspots: [
    {
      id: 'sofa',
      x: '40%',
      y: '60%',
      label: 'Modern Sofa',
      data: { title: 'Modern Sofa', originalPrice: '$1,099', price: '$899', description: 'Comfortable 3-seat sofa' },
    },
    {
      id: 'lamp',
      x: '75%',
      y: '25%',
      label: 'Floor Lamp',
      markerStyle: 'dot-label',
      data: { title: 'Arc Floor Lamp', price: '$249' },
    },
  ],
  onOpen(hotspot) {
    console.log('Opened:', hotspot.id);
  },
});

HTML Data-Attributes

<div
  data-ci-hotspot-src="https://example.com/room.jpg"
  data-ci-hotspot-alt="Living room"
  data-ci-hotspot-zoom="true"
  data-ci-hotspot-trigger="hover"
  data-ci-hotspot-items='[
    {"id":"sofa","x":"40%","y":"60%","label":"Sofa","data":{"title":"Sofa","price":"$899"}}
  ]'
></div>

<script>CIHotspot.autoInit();</script>

API Reference

Constructor

new CIHotspot(element: HTMLElement | string, config: CIHotspotConfig)

Config

| Option | Type | Default | Description | |--------|------|---------|-------------| | src | string | — | Image source URL (required) | | hotspots | HotspotItem[] | — | Array of hotspot definitions (required) | | alt | string | '' | Image alt text | | trigger | 'hover' \| 'click' \| 'load' | 'hover' | Popover trigger mode | | zoom | boolean | false | Enable zoom & pan | | zoomMax | number | 4 | Maximum zoom level | | zoomMin | number | 1 | Minimum zoom level | | theme | 'light' \| 'dark' | 'light' | Theme | | pulse | boolean | true | Marker pulse animation | | placement | 'top' \| 'bottom' \| 'left' \| 'right' \| 'auto' | 'top' | Popover placement | | lazyLoad | boolean | true | Lazy load image | | zoomControls | boolean | true | Show zoom control buttons | | zoomControlsPosition | 'top-left' \| 'top-center' \| 'top-right' \| 'bottom-left' \| 'bottom-center' \| 'bottom-right' | 'bottom-right' | Zoom controls position | | renderPopover | (hotspot) => string \| HTMLElement | — | Custom popover render | | onOpen | (hotspot) => void | — | Popover open callback | | onClose | (hotspot) => void | — | Popover close callback | | onZoom | (level) => void | — | Zoom change callback | | onClick | (event, hotspot) => void | — | Marker click callback | | cloudimage | CloudimageConfig | — | Cloudimage CDN config | | scenes | Scene[] | — | Array of scenes for multi-image navigation | | initialScene | string | first scene | Scene ID to display initially | | sceneTransition | 'fade' \| 'slide' \| 'none' | 'fade' | Scene transition animation | | sceneAspectRatio | string | — | Fixed viewport ratio (e.g. '16/9'). Prevents layout jumps. | | onSceneChange | (id, scene) => void | — | Scene change callback |

HotspotItem

| Field | Type | Description | |-------|------|-------------| | id | string | Unique identifier (required) | | x | string \| number | X coordinate: '65%' or 650 (px) | | y | string \| number | Y coordinate: '40%' or 400 (px) | | label | string | Accessible label (required) | | markerStyle | 'dot' \| 'dot-label' | Marker style — 'dot-label' shows a text pill next to the dot | | data | PopoverData | Data for built-in template | | content | string | HTML content (sanitized) | | trigger | 'hover' \| 'click' \| 'load' | Override global trigger | | placement | Placement | Override global placement | | className | string | Custom CSS class | | hidden | boolean | Initially hidden | | icon | string | Custom icon | | navigateTo | string | Scene ID to navigate to on click |

PopoverData

| Field | Type | Description | |-------|------|-------------| | title | string | Popover heading | | originalPrice | string | Strikethrough price shown before current price (e.g. '$1,499') | | price | string | Current price | | description | string | Description text | | image | string | Image URL displayed at top of popover | | url | string | Link URL for the CTA button | | ctaText | string | CTA button label (default: 'View details') |

Instance Methods

instance.open(id: string): void
instance.close(id: string): void
instance.closeAll(): void
instance.setZoom(level: number): void
instance.getZoom(): number
instance.resetZoom(): void
instance.addHotspot(hotspot: HotspotItem): void
instance.removeHotspot(id: string): void
instance.updateHotspot(id: string, updates: Partial<HotspotItem>): void
instance.update(config: Partial<CIHotspotConfig>): void
instance.destroy(): void
instance.goToScene(sceneId: string): void
instance.getCurrentScene(): string | undefined
instance.getScenes(): string[]

Static Methods

CIHotspot.autoInit(root?: HTMLElement): CIHotspotInstance[]

React Usage

import { CIHotspotViewer, useCIHotspot } from 'js-cloudimage-hotspot/react';

// Component
function ProductImage() {
  return (
    <CIHotspotViewer
      src="/living-room.jpg"
      alt="Living room"
      zoom
      hotspots={[
        { id: 'sofa', x: '40%', y: '60%', label: 'Sofa', data: { title: 'Sofa', price: '$899' } },
      ]}
      onOpen={(h) => console.log('Opened:', h.id)}
    />
  );
}

// Hook
function ProductImage() {
  const { containerRef, instance } = useCIHotspot({
    src: '/room.jpg',
    hotspots: [...],
    zoom: true,
  });

  return (
    <>
      <div ref={containerRef} />
      <button onClick={() => instance.current?.setZoom(2)}>Zoom 2x</button>
    </>
  );
}

// Ref API
function ProductImage() {
  const ref = useRef<CIHotspotViewerRef>(null);
  return (
    <>
      <CIHotspotViewer ref={ref} src="/room.jpg" hotspots={[...]} zoom />
      <button onClick={() => ref.current?.open('sofa')}>Show Sofa</button>
    </>
  );
}

Multi-Image Scenes

Navigate between multiple images, each with its own hotspots:

const viewer = new CIHotspot('#tour', {
  scenes: [
    {
      id: 'living-room',
      src: '/living-room.jpg',
      alt: 'Living room',
      hotspots: [
        { id: 'sofa', x: '40%', y: '60%', label: 'Sofa', data: { title: 'Modern Sofa' } },
        { id: 'go-kitchen', x: '85%', y: '50%', label: 'Go to Kitchen', navigateTo: 'kitchen' },
      ],
    },
    {
      id: 'kitchen',
      src: '/kitchen.jpg',
      alt: 'Kitchen',
      hotspots: [
        { id: 'island', x: '50%', y: '65%', label: 'Island', data: { title: 'Marble Island' } },
        { id: 'go-back', x: '10%', y: '50%', label: 'Back', navigateTo: 'living-room' },
      ],
    },
  ],
  sceneTransition: 'fade',  // 'fade' | 'slide' | 'none'
});

// Programmatic navigation
viewer.goToScene('kitchen');
viewer.getCurrentScene(); // 'kitchen'
viewer.getScenes();       // ['living-room', 'kitchen']

Hotspots with navigateTo display as arrow markers and switch scenes on click.

Theming

All visuals are customizable via CSS variables:

.my-viewer {
  --ci-hotspot-marker-bg: rgba(0, 88, 163, 0.8);
  --ci-hotspot-pulse-color: rgba(0, 88, 163, 0.3);
  --ci-hotspot-cta-bg: #e63946;
  --ci-hotspot-popover-border-radius: 4px;
  --ci-hotspot-popover-text-align: center; /* left (default) | center | right */
}

Set theme: 'dark' for the built-in dark theme.

Accessibility

• All markers are <button> elements with aria-label
• Tab / Shift+Tab navigates between markers
• Enter / Space toggles popovers
• Escape closes popovers and returns focus
• Arrow keys pan when zoomed
• + / - / 0 zoom controls
• Focus trapping in popovers with interactive content
• prefers-reduced-motion disables animations

Cloudimage Integration

new CIHotspot('#el', {
  src: 'https://example.com/room.jpg',
  cloudimage: {
    token: 'demo',
    limitFactor: 100,
    params: 'q=80',
  },
  hotspots: [...],
});

Browser Support

| Browser | Version | |---------|---------| | Chrome | 80+ | | Firefox | 80+ | | Safari | 14+ | | Edge | 80+ |

License

MIT

Support

If this library helped your project, consider buying me a coffee!