I have the following code that groups latitude's and longitude's into hexbins and draws them on a map using a mapbox base map with a deck.gl layer on top of it:
<!doctype html>
<html lang="en">
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<!-- deck.gl standalone bundle -->
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist.min.js"></script>
<!-- d3 -->
<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/5.16.0/d3.min.js"></script>
<!-- Mapbox dependencies -->
<script src="https://api.tiles.mapbox.com/mapbox-gl-js/v1.4.0/mapbox-gl.js"></script>
<link href="https://api.tiles.mapbox.com/mapbox-gl-js/v1.4.0/mapbox-gl.css" rel="stylesheet" />
<style>
body {
width: 100vw;
height: 100vh;
margin: 0;
}
#control-panel {
font-family: Helvetica, Arial, sans-serif;
position: absolute;
background: #fff;
top: 0;
left: 0;
margin: 12px;
padding: 20px;
z-index: 1;
}
label {
display: inline-block;
width: 140px;
}
</style>
</head>
<body>
<div id="control-panel">
<div>
<label>Radius</label>
<input id="radius" type="range" min="1000" max="20000" step="1000" value="1000"></input>
<span id="radius-value"></span>
</div>
<div>
<label>Coverage</label>
<input id="coverage" type="range" min="0" max="1" step="0.1" value="1"></input>
<span id="coverage-value"></span>
</div>
<div>
<label>Upper Percentile</label>
<input id="upperPercentile" type="range" min="90" max="100" step="1" value="100"></input>
<span id="upperPercentile-value"></span>
</div>
</div>
<script>
const deckgl = new deck.DeckGL({
mapboxApiAccessToken: '<mapbox_pk_token>',
mapStyle: 'mapbox://styles/mapbox/dark-v9',
initialViewState: {
longitude: -122.413756,
latitude: 37.779528,
zoom: 6,
minZoom: 0,
maxZoom: 21,
pitch: 40.5
},
controller: true
});
//const data = d3.csv('https://raw.githubusercontent.com/uber-common/deck.gl-data/master/examples/3d-heatmap/heatmap-data.csv');
const data = [
{name: 'Colma1', passengers: 4214, lng: '-122.466233', lat: '37.684638'},
{name: 'Colma2', passengers: 4214, lng: '-122.466233', lat: '37.684638'},
{name: 'Colma3', passengers: 4214, lng: '-122.466233', lat: '37.684638'},
{name: 'Civic Center1', passengers: 24798, lng: '-122.413756', lat: '37.779528'},
{name: 'Civic Center2', passengers: 24798, lng: '-122.413756', lat: '37.779528'},
{name: 'Civic Center3', passengers: 24798, lng: '-122.413756', lat: '37.779528'},
{name: 'Civic Center4', passengers: 24798, lng: '-122.413756', lat: '37.779528'},
{name: 'Civic Center5', passengers: 24798, lng: '-122.413756', lat: '37.779528'},
];
const OPTIONS = ['radius', 'coverage', 'upperPercentile'];
const COLOR_RANGE = [
[1, 152, 189],
[73, 227, 206],
[216, 254, 181],
[254, 237, 177],
[254, 173, 84],
[209, 55, 78]
];
OPTIONS.forEach(key => {
document.getElementById(key).oninput = renderLayer;
});
renderLayer();
function renderLayer () {
const options = {};
OPTIONS.forEach(key => {
const value = +document.getElementById(key).value;
document.getElementById(key + '-value').innerHTML = value;
options[key] = value;
});
const hexagonLayer = new deck.HexagonLayer({
id: 'heatmap',
colorRange: COLOR_RANGE,
data,
elevationRange: [0, 1000],
elevationScale: 250,
extruded: true,
getPosition: d => [Number(d.lng), Number(d.lat)],
opacity: 1,
pickable: true,
onHover: ({object, x, y}) => {
const tooltip = `Count: 12`;
},
...options
});
deckgl.setProps({
layers: [hexagonLayer],
tooltip: {
'html': '<b>Elevation Value:</b>',
'style': {
'color': 'white'
}
}
});
}
</script>
</body>
</html>
I would like to add a tooltip to each hexbin (bar chart on top of map), but I'm not sure how to accomplish this. The only examples I could find around tooltips was this, so it looks like it should be possible. I attempted to add it on the layer using this part of the code:
tooltip: {
'html': '<b>Elevation Value:</b>',
'style': {
'color': 'white'
}
}
but it did not work. Does anyone know how I can accomplish this? I have some extra data in the data field namely name and passengers, preferrably I would like to say create the first hexbin tooltip as a comma separated list of data.name values. The example seems to refer to variables using {colorValue} for example. Alternatively tooltips per hexbin could also possibly be acceptable. I'm just running on my local machine as a static page so not sure if that makes a difference.
Edit: Added the following code based on this, but this also did not work:
pickable: true,
onHover: ({object, x, y}) => {
const tooltip = `Count: 12`;
},
It also referred to ${object.centroid.join(', ')}\nCount: ${object.points.length} but that gave an error.
The easiest way to do this is the getTooltip property. If you want to use the onHover property, which gives you a bit more control, you have to create and manage the tooltip DOM element yourself.