openfreemap/website/assets/map_howto.js

function initMap() {
  if (window.map) return

  const map = new maplibregl.Map({
    style: 'https://tiles.openfreemap.org/styles/liberty',
    center: [-0.114, 51.506],
    zoom: 14.2,
    bearing: 55.2,
    pitch: 60,
    container: mapDiv,
    boxZoom: false,
    // doubleClickZoom: false,
    scrollZoom: false,
    attributionControl: false,
  })
  window.map = map

  map.once('idle', () => {
    document.getElementById('mapbg-image').remove()
  })

  let nav = new maplibregl.NavigationControl({ showCompass: false })
  map.addControl(nav, 'top-right')

  let scale = new maplibregl.ScaleControl()
  map.addControl(scale)

  let attrib = new maplibregl.AttributionControl({
    compact: false,
  })
  map.addControl(attrib)

  new maplibregl.Marker().setLngLat([-0.119, 51.507]).addTo(map)
}

const mapDiv = document.getElementById('map-container')
mapDiv.onclick = function () {
  initMap()
}

// initMap()

function selectStyle(event, style) {
  initMap()
  toggleButtonSelection(event.target)

  const styleUrl = 'https://tiles.openfreemap.org/styles/' + style
  map.setStyle(styleUrl)
  map.setPitch(0)
  map.setBearing(0)
  map.setZoom(12.5)

  document.getElementById('style-url-code').innerText = styleUrl
}

function toggleButtonSelection(clickedButton) {
  clickedButton.classList.add('selected')

  Array.from(clickedButton.parentElement.children)
    .filter(child => child !== clickedButton)
    .forEach(button => button.classList.remove('selected'))
}