CartoLayer + Widget autorefresh

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>
    
<script src='https://unpkg.com/@turf/turf@6/turf.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 id="widgets">
        <div id="global-widget"></div>
        <div id="viewport-widget"></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 = 'xxxx-update---';

deck.carto.setDefaultCredentials({
  apiBaseUrl: 'https://gcp-us-east1.api.carto.com',
  accessToken
});

const spinner = document.getElementById('spinner');
const loadingInfo = document.getElementById('loading-info');
const globalWidget = document.getElementById('global-widget');
const viewportWidget = document.getElementById('viewport-widget');

let currentViewport

const deckgl = new deck.DeckGL({
  container: "basemap",
  map: maplibregl,
  mapStyle: deck.carto.BASEMAP.VOYAGER,
  initialViewState: {
    latitude: 40,
    longitude: -80,
    zoom: 3
  },
  controller: true,
  onViewStateChange: ({
    viewState
  }) => {
    const bounds = new deck.WebMercatorViewport(viewState).getBounds()
    currentViewport = turf.bboxPolygon(bounds)
    console.log(currentViewport)
  }
});

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

let previousUpdate = null;

const dataSource = {
  connection: 'bqconn-front',
  type: 'query',
  source: 'SELECT * FROM `cartodb-on-gcp-frontend-team.victor.airports_enriched`'
}

async function fetchLayerData() {
  const {
    data
  } = await deck.carto.fetchLayerData({
    ...dataSource,
    format: 'tilejson',
    headers: {
      'Cache-Control': 'max-age=60'
    }
  })

  const lastCache = (new URL(data.tiles)).searchParams.get('cache');
  const lastUpdate = new Date(parseInt(lastCache));
  
  console.log('last cache check: ', lastCache)
  
  return {
    tileJson: data.tiles,
    lastUpdate
  }
}

async function fetchData() {
  spinner.style.opacity = 1;
  const {
    tileJson,
    lastUpdate
  } = await fetchLayerData()

  if (previousUpdate < lastUpdate) {
    previousUpdate = lastUpdate;

    updateUI({
      tileJson,
      lastUpdate
    })
  }

 ...