Filter within a Layer

This example shows how to filter a layer based on user input using setFilter(). Download the earthquake sample data.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';

const data = {};

const map = new Map({
  container: 'map',
  style: MapStyle.DATAVIZ.DARK,
  center: [-156.6, 44],
  zoom: 1.6,
});

map.on('load', async function () {
  await maptilersdk.helpers.addPoint(map, {
    layerId: 'earthquakes',
    data: 'YOUR_MAPTILER_DATASET_ID_HERE',
    pointColor: '#FB3A1B',
    pointRadius: 40
  });

});

document.getElementById('nav-filter').addEventListener('change', (e) => {
  let filterOnValue = ['all'];
  let operator = '==';

  switch (e.target.id) {
    /// example: `map.setFilter("earthquakes", ["any", [">", "felt", 16.0]])`
    case 'felt':
      operatorFelt = document.getElementById('operator-felt');
      felt = document.getElementById('range-felt');
      operator = operatorFelt.value;

      // eslint-disable-next-line no-unused-expressions
      e.target.checked ? data.felt = Number(felt.value) : delete data['felt'];

      break;

    /// example: `map.setFilter("earthquakes", ["any", [">", "mag", 5.0]])`
    case 'mag':
      operatorMag = document.getElementById('operator-mag');
      mag = document.getElementById('range-mag');
      operator = operatorMag.value;

      // eslint-disable-next-line no-unused-expressions
      e.target.checked ? data.mag = Number(mag.value) : delete data['mag'];

      break;

    /// example: `map.setFilter("earthquakes", ["any", [">", "tsunami", 0]])`
    case 'tsunami':
      // eslint-disable-next-line @typescript-eslint/quotes
      tsunami = document.querySelector("input[type='radio'][name=tsunami]:checked");
      operator = '==';

      // eslint-disable-next-line no-unused-expressions
      e.target.checked ? data.tsunami = Number(tsunami.value) : delete data['tsunami'];

      break;
    default:
      console.log('default');
  }

  filterOnValue = Object.keys(data);

  mapLibreFilterSpread = ['all', ...filterOnValue.map(id => [operator, id, data[id]])];
  mapLibreFilter = mapLibreFilterSpread;

  document.getElementById('filter-result').textContent = JSON.stringify(mapLibreFilter);

  map.setFilter('earthquakes', mapLibreFilter);
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Filter within a Layer | NPM example</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>
  <style>
  .map-overlay {
    font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
    position: absolute;
    width: 31.8%;
    top: 0;
    left: 0;
    padding: 10px;
  }

  .map-overlay .map-overlay-inner {
    background-color: #fff;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
    border-radius: 3px;
    padding: 10px;
    margin-bottom: 10px;
  }

  .map-overlay input {
    margin: 2px;
  }

  input[type=number] {
    width: 25%
  }

  #filter-result {
    font-size: 8px;
    font-family: "Courier New";
  }
  </style>
  <div id="map"></div>
  <div class="map-overlay top">
  <div class="map-overlay-inner">
      <nav id="nav-filter">
          <fieldset>
              <legend>🫨 Earthquake <code>felt</code>?</legend>
              <div>
                  <input id="felt" type="checkbox" />
                  <label for="felt">Apply <code>felt</code> Filter</label>
                  <div>
                      <div>
                          <label for="operator-select">Operator:</label>
                          <select name="operator" id="operator-felt">
                              <option value=">">></option>
                              <option value="==" selected>==</option>
                              <option value="<"><</option>
                          </select>
                          <br>
                          <label for="range">Felt:</label>
                          <input type="number" id="range-felt" name="range" value="4" min="1.0" max="10000" />
                      </div>
                  </div>
          </fieldset>

          <fieldset>
              <legend>📈 Magnitude</legend>
              <div>
                  <input id="mag" type="checkbox" />
                  <label for="mag">Apply <code>magnitude</code> Filter</label>
                  <div>
                      <div>
                          <label for="operator-select">Operator:</label>
                          <select name="operator" id="operator-mag">
                              <option value=">">></option>
                              <option value="==" selected>==</option>
                              <option value="<"><</option>
                          </select>
                          <br>
                          <label for="range">Magnitude:</label>
                          <input type="number" id="range-mag" name="range" value="2.71" min="0.0" max="100" />
                      </div>
                  </div>
          </fieldset>

          <fieldset>
              <legend>🌊 Tsunami (0 or 1)</legend>
              <input id="tsunami" type="checkbox" /> <label>Apply <code>tsunami</code> filter</label>
              <div id="radio-tsunamis">
                  <input type="radio" id="t0" name="tsunami" value="0" /><label>0</label>
                  <input type="radio" id="t1" name="tsunami" value="1" /><label>1</label>
              </div>
          </fieldset>
      </nav>
      <hr />
      <div id='filter-result'>["all"]</div>
  </div>
  </div>
  <script type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Filter within a Layer</title>
  <script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
  <link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.css" rel="stylesheet" />
  <style>
    body {
      margin: 0;
      padding: 0;
    }

    #map {
      position: absolute;
      top: 0;
      bottom: 0;
      width: 100%;
    }

    .map-overlay {
      font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
      position: absolute;
      width: 31.8%;
      top: 0;
      left: 0;
      padding: 10px;
    }

    .map-overlay .map-overlay-inner {
      background-color: #fff;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2);
      border-radius: 3px;
      padding: 10px;
      margin-bottom: 10px;
    }

    .map-overlay input {
      margin: 2px;
    }

    input[type=number] {
      width: 25%
    }

    #filter-result {
      font-size: 8px;
      font-family: "Courier New";
    }
  </style>
</head>

<body>
  <div id="map"></div>
  <div class="map-overlay top">
    <div class="map-overlay-inner">
      <nav id="nav-filter">
        <fieldset>
          <legend>🫨 Earthquake <code>felt</code>?</legend>
          <div>
            <input id="felt" type="checkbox" />
            <label for="felt">Apply <code>felt</code> Filter</label>
            <div>
              <div>
                <label for="operator-select">Operator:</label>
                <select name="operator" id="operator-felt">
                  <option value=">">></option>
                  <option value="==" selected>==</option>
                  <option value="<">
                    << /option>
                </select>
                <br>
                <label for="range">Felt:</label>
                <input type="number" id="range-felt" name="range" value="4" min="1.0" max="10000" />
              </div>
            </div>
        </fieldset>

        <fieldset>
          <legend>📈 Magnitude</legend>
          <div>
            <input id="mag" type="checkbox" />
            <label for="mag">Apply <code>magnitude</code> Filter</label>
            <div>
              <div>
                <label for="operator-select">Operator:</label>
                <select name="operator" id="operator-mag">
                  <option value=">">></option>
                  <option value="==" selected>==</option>
                  <option value="<">
                    << /option>
                </select>
                <br>
                <label for="range">Magnitude:</label>
                <input type="number" id="range-mag" name="range" value="2.71" min="0.0" max="100" />
              </div>
            </div>
        </fieldset>

        <fieldset>
          <legend>🌊 Tsunami (0 or 1)</legend>
          <input id="tsunami" type="checkbox" /> <label>Apply <code>tsunami</code> filter</label>
          <div id="radio-tsunamis">
            <input type="radio" id="t0" name="tsunami" value="0" /><label>0</label>
            <input type="radio" id="t1" name="tsunami" value="1" /><label>1</label>
          </div>
        </fieldset>
      </nav>
      <hr />
      <div id='filter-result'>["all"]</div>
    </div>
  </div>

  <script>

    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';

    const data = {};

    const map = new maptilersdk.Map({
      container: 'map',
      style: maptilersdk.MapStyle.DATAVIZ.DARK,
      center: [-156.6, 44],
      zoom: 1.6,
    });

    map.on('load', async function () {
      await maptilersdk.helpers.addPoint(map, {
        layerId: 'earthquakes',
        data: 'YOUR_MAPTILER_DATASET_ID_HERE',
        pointColor: '#FB3A1B',
        pointRadius: 40
      });

    });

    document.getElementById('nav-filter').addEventListener('change', (e) => {
      let filterOnValue = ['all'];
      let operator = '==';

      switch (e.target.id) {
        /// example: `map.setFilter("earthquakes", ["any", [">", "felt", 16.0]])`
        case 'felt':
          operatorFelt = document.getElementById('operator-felt');
          felt = document.getElementById('range-felt');
          operator = operatorFelt.value;

          // eslint-disable-next-line no-unused-expressions
          e.target.checked ? data.felt = Number(felt.value) : delete data['felt'];

          break;

        /// example: `map.setFilter("earthquakes", ["any", [">", "mag", 5.0]])`
        case 'mag':
          operatorMag = document.getElementById('operator-mag');
          mag = document.getElementById('range-mag');
          operator = operatorMag.value;

          // eslint-disable-next-line no-unused-expressions
          e.target.checked ? data.mag = Number(mag.value) : delete data['mag'];

          break;

        /// example: `map.setFilter("earthquakes", ["any", [">", "tsunami", 0]])`
        case 'tsunami':
          // eslint-disable-next-line @typescript-eslint/quotes
          tsunami = document.querySelector("input[type='radio'][name=tsunami]:checked");
          operator = '==';

          // eslint-disable-next-line no-unused-expressions
          e.target.checked ? data.tsunami = Number(tsunami.value) : delete data['tsunami'];

          break;
        default:
          console.log('default');
      }

      filterOnValue = Object.keys(data);

      mapLibreFilterSpread = ['all', ...filterOnValue.map(id => [operator, id, data[id]])];
      mapLibreFilter = mapLibreFilterSpread;

      document.getElementById('filter-result').textContent = JSON.stringify(mapLibreFilter);

      map.setFilter('earthquakes', mapLibreFilter);
    });
  </script>
</body>

</html>