Markers

Working with markers examples

Marker Examples

Learn how to work with markers on your maps.

Single Marker

import { HereMap, Marker } from '@rodrito/react-here-maps';

export function SingleMarkerMap() {
  return (
    <HereMap
      apikey="YOUR_API_KEY"
      options={{ center: { lat: 40.7128, lng: -74.0060 }, zoom: 13 }}
    >
      <Marker
        position={{ lat: 40.7128, lng: -74.0060 }}
        label="Times Square"
      />
    </HereMap>
  );
}

Multiple Markers

const landmarks = [
  { id: 1, name: 'Statue of Liberty', lat: 40.6892, lng: -74.0445 },
  { id: 2, name: 'Central Park', lat: 40.785091, lng: -73.968285 },
  { id: 3, name: 'Brooklyn Bridge', lat: 40.7061, lng: -73.9969 },
];

<HereMap apikey="YOUR_API_KEY" options={{ center: { lat: 40.7128, lng: -74.0060 }, zoom: 11 }}>
  {landmarks.map((landmark) => (
    <Marker
      key={landmark.id}
      position={{ lat: landmark.lat, lng: landmark.lng }}
      label={landmark.name}
    />
  ))}
</HereMap>

Draggable Marker

import { useState } from 'react';

export function DraggableMarkerExample() {
  const [position, setPosition] = useState({ lat: 40.7128, lng: -74.0060 });

  return (
    <>
      <HereMap apikey="YOUR_API_KEY" options={{ center: position, zoom: 13 }}>
        <Marker
          position={position}
          draggable
          onDragEnd={(event) => {
            const coord = event.target.getGeometry();
            setPosition({ lat: coord.lat, lng: coord.lng });
          }}
        />
      </HereMap>

      <div>
        <p>Latitude: {position.lat.toFixed(6)}</p>
        <p>Longitude: {position.lng.toFixed(6)}</p>
      </div>
    </>
  );
}

Custom Icon Markers

<HereMap apikey="YOUR_API_KEY" options={{ center: { lat: 40.7128, lng: -74.0060 }, zoom: 13 }}>
  <Marker
    position={{ lat: 40.7128, lng: -74.0060 }}
    icon="/custom-marker-red.png"
    iconSize={{ w: 32, h: 32 }}
    iconAnchor={{ x: 16, y: 32 }}
  />
</HereMap>

Clickable Markers with State

import { useState } from 'react';

interface Location {
  id: number;
  name: string;
  lat: number;
  lng: number;
  description: string;
}

export function ClickableMarkers() {
  const [selected, setSelected] = useState<number | null>(null);

  const locations: Location[] = [
    {
      id: 1,
      name: 'Location A',
      lat: 40.7128,
      lng: -74.0060,
      description: 'Description for location A',
    },
    {
      id: 2,
      name: 'Location B',
      lat: 40.7589,
      lng: -73.9851,
      description: 'Description for location B',
    },
  ];

  return (
    <>
      <HereMap apikey="YOUR_API_KEY" options={{ center: { lat: 40.7358, lng: -73.9955 }, zoom: 12 }}>
        {locations.map((loc) => (
          <Marker
            key={loc.id}
            position={{ lat: loc.lat, lng: loc.lng }}
            label={loc.name}
            onClick={() => setSelected(loc.id)}
            icon={
              selected === loc.id
                ? '/marker-selected.png'
                : '/marker-default.png'
            }
          />
        ))}
      </HereMap>

      {selected && (
        <div style={{ marginTop: '1rem', padding: '1rem', background: '#f0f0f0' }}>
          <h3>{locations.find((l) => l.id === selected)?.name}</h3>
          <p>{locations.find((l) => l.id === selected)?.description}</p>
        </div>
      )}
    </>
  );
}

Dynamic Marker Updates

import { useState, useEffect } from 'react';

export function LiveTrackingMarker() {
  const [position, setPosition] = useState({ lat: 40.7128, lng: -74.0060 });

  useEffect(() => {
    const interval = setInterval(() => {
      // Simulate GPS updates
      setPosition((prev) => ({
        lat: prev.lat + (Math.random() - 0.5) * 0.001,
        lng: prev.lng + (Math.random() - 0.5) * 0.001,
      }));
    }, 1000);

    return () => clearInterval(interval);
  }, []);

  return (
    <HereMap apikey="YOUR_API_KEY" options={{ center: position, zoom: 15 }}>
      <Marker position={position} label="Live" icon="/tracking-marker.png" />
    </HereMap>
  );
}

Marker Clustering (Simple)

import { useState, useEffect } from 'react';
import { useMapContext } from '@rodrito/react-here-maps';

export function ClusteredMarkers() {
  const [zoom, setZoom] = useState(10);
  const [visibleMarkers, setVisibleMarkers] = useState([]);

  const allMarkers = Array.from({ length: 100 }, (_, i) => ({
    id: i,
    lat: 40.7128 + (Math.random() - 0.5) * 0.5,
    lng: -74.0060 + (Math.random() - 0.5) * 0.5,
  }));

  useEffect(() => {
    // Simple clustering: show fewer markers at lower zoom
    const count = Math.floor(zoom * 5);
    setVisibleMarkers(allMarkers.slice(0, count));
  }, [zoom]);

  return (
    <HereMap
      apikey="YOUR_API_KEY"
      options={{ center: { lat: 40.7128, lng: -74.0060 }, zoom }}
    >
      {visibleMarkers.map((marker) => (
        <Marker key={marker.id} position={{ lat: marker.lat, lng: marker.lng }} />
      ))}
    </HereMap>
  );
}

See Also

Marker API

Full marker component reference

Polylines

Connect markers with lines

Interactive

Advanced interactions

Basic Maps

Getting started examples