Custom Component using Mapbox + React

💬 App Building
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7

Thank you for the guidance. Here’s a minimalist implementation of how we successfully extracted the Geojson from the map using vanilla JS.

Add ‘data’ component to Custom Component model. This will hold the generated polygons:

{  data: {} }

This function will update model each time the user draws a polygon (full code below):

function updateData(e) {
  var data = draw.getAll();
  window.Retool.modelUpdate({ data })
}

Extract the ‘data’ object from the component’s model. Perhaps onto a jsonexplorer.

{{customcomponent1.model.data}}

Custom Component full code:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Extract drawn polygon area</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v2.1.1/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>


<script src="https://api.tiles.mapbox.com/mapbox.js/plugins/turf/v3.0.11/turf.min.js"></script>
<script src="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.2.1/mapbox-gl-draw.js"></script>
<link rel="stylesheet" href="https://api.mapbox.com/mapbox-gl-js/plugins/mapbox-gl-draw/v1.2.1/mapbox-gl-draw.css" type="text/css">
<div id="map"></div>
<div class="calculation-box">
    <p>Draw a polygon using the draw tools.</p>
    <div id="calculated-area"></div>
</div>

<script>
	mapboxgl.accessToken = 'pk.eyJ1IjoiZXN0b3JudWRhbWUiLCJhIjoiY2s4YXd3aXNkMDJvNDNkb3diMmJqb3FkYiJ9.bDVBManMcJ7p1zPFQFEw9w';
var map = new mapboxgl.Map({
  container: 'map', // container id
  style: 'mapbox://styles/mapbox/dark-v10', //hosted style id
  center: [-99.125519, 19.451054], // starting position
  zoom: 8 // starting zoom
});

    var draw = new MapboxDraw({
        displayControlsDefault: false,
        controls: {
            polygon: true,
            trash: true
        }
    });
    map.addControl(draw);

    map.on('draw.create', updateData);
    map.on('draw.delete', updateData);
    map.on('draw.update', updateData);

    function updateData(e) {
      var data = draw.getAll();
      window.Retool.modelUpdate({ data })
    }


</script>

</body>
</html>
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