CartoLayer auto refresh

by VictorVelarde

HTML

<!DOCTYPE html>
<html>

  <head>
    <title>Auto refresh</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script src="https://unpkg.com/deck.gl@latest/dist.min.js"></script>
    <script src="https://unpkg.com/@deck.gl/carto@latest/dist.min.js"></script>

    <script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
    <link href="https://unpkg.com/[email protected]/dist/maplibre-gl.css" rel="stylesheet" />
    <script src="https://unpkg.com/[email protected]/dist/html2canvas.min.js"></script>
  </head>

  <body>
    <div id="map">
      <div id="basemap"></div>
    </div>

    <div class="loading-container">
      <div id="loading-info">Loading data...</div>

      <div id="spinner" class="spinner">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
      </div>
    </div>
  </body>

</html>

CSS

body {
  margin: 0;
  padding: 0;
}

#map {
  position: relative;
  width: 100vw;
  height: 100vh;
  z-index: 1;
}

#basemap {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}

.loading-container {
  position: absolute;
  top: 10px;
  left: 10px;
  height: 24px;
  z-index: 100;
  background: white;
  border-radius: 24px;
  box-shadow: rgba(0, 0, 0, 0.2) 1px 1px 5px;
}

#loading-info {
  float: right;
  margin: 4px 12px;
  color: #2e71ff;
  font-family: sans-serif;
  font-size: 14px;
}

.spinner {
  display: inline-block;
  position: relative;
  top: 0;
  z-index: 100;
  width: 20px;
  height: 20px;
  transition: opacity 0.3s ease-in-out;
}

.spinner div {
  box-sizing: border-box;
  display: inline-block;
  position: absolute;
  width: 16px;
  height: 16px;
  margin: 4px;
  border: 2px solid #fff;
  border-radius: 50%;
  animation: spinner 1.2s cubic-bezier(0.5, 0, 0.5, 1) infinite;
  border-color: #2e71ff transparent transparent transparent;
  box-shadow: 2px black;
}

.spinner div:nth-child(1) {
  animation-delay: -0.45s;
}

.spinner div:nth-child(2) {
  animation-delay: -0.3s;
}

.spinner div:nth-child(3) {
  animation-delay: -0.15s;
}

@keyframes spinner {
  0% {
    transform: rotate(0deg);
  }

  100% {
    transform: rotate(360deg);
  }
}

JavaScript

const accessToken = 'xxx';

deck.carto.setDefaultCredentials({
  apiBaseUrl: 'https://gcp-europe-west1.api.carto.com',
  accessToken
});

const spinner = document.getElementById('spinner');
const loadingInfo = document.getElementById('loading-info');

const deckgl = new deck.DeckGL({
  container: "basemap",
  map: maplibregl,
  mapStyle: deck.carto.BASEMAP.VOYAGER,
  initialViewState: {
    latitude: 40,
    longitude: -80,
    zoom: 3
  },
  controller: true,
});

function renderLayer(data) {
  return new deck.carto._CartoTileLayer({
    data,
    getFillColor: [238, 77, 90],
    pointRadiusMinPixels: 2.5,
    loadOptions: {
      fetch: {
        headers: {
          'Authorization': `Bearer ${accessToken}`
        }
      }
    }
  });
}

let cache = 0;

async function fetchLayerData(){
 return deck.carto.fetchLayerData({
    connection: 'cartodb-on-gcp-strategic-sol',
    type: 'table',
    source: 'cartodb-on-gcp-strategic-sol.carto_data_refresh.airports_refresh',
    format: 'tilejson',
    headers: {
      'Cache-Control': 'max-age=60'
    }
  })
}

async function fetchData() {
  spinner.style.opacity = 1;
  const data = await deck.carto.fetchLayerData({
    connection: 'cartodb-on-gcp-strategic-sol',
    type: 'table',
    source: 'cartodb-on-gcp-strategic-sol.carto_data_refresh.airports_refresh',
    format: 'tilejson',
    headers: {
      'Cache-Control': 'max-age=60'
    }
  })

  const newCache = (new URL(data.data.tiles)).searchParams.get('cache');
  if (cache !== newCache) {
    cache = newCache;
    const date = new Date(parseInt(cache));
    loadingInfo.innerHTML = `Last update: ${date.toLocaleTimeString()}`;

    deckgl.setProps({
      layers: [renderLayer(data.data)]
    });
  }

  spinner.style.opacity = 0;
}

fetchData();
setInterval(fetchData, 10 * 1000); // 10 second refresh