Get features under the mouse pointer
Use queryRenderedFeatures
to show properties of hovered-over map elements.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Get features under the mouse pointer</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<link href="https://api.mapbox.com/mapbox-gl-js/v3.7.0/mapbox-gl.css" rel="stylesheet">
<script src="https://api.mapbox.com/mapbox-gl-js/v3.7.0/mapbox-gl.js"></script>
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<style>
#features {
position: absolute;
top: 0;
right: 0;
bottom: 0;
width: 50%;
overflow: auto;
background: rgba(255, 255, 255, 0.8);
}
#map canvas {
cursor: crosshair;
}
</style>
<div id="map"></div>
<pre id="features"></pre>
<script>
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
const map = new mapboxgl.Map({
container: 'map',
// Choose from Mapbox's core styles, or make your own style with Mapbox Studio
style: 'mapbox://styles/mapbox/streets-v12',
center: [-96, 37.8],
zoom: 3
});
map.on('mousemove', (e) => {
const features = map.queryRenderedFeatures(e.point);
// Limit the number of properties we're displaying for
// legibility and performance
const displayProperties = [
'type',
'properties',
'id',
'layer',
'source',
'sourceLayer',
'state'
];
const displayFeatures = features.map((feat) => {
const displayFeat = {};
displayProperties.forEach((prop) => {
displayFeat[prop] = feat[prop];
});
return displayFeat;
});
// Write object as string with an indent of two spaces.
document.getElementById('features').innerHTML = JSON.stringify(
displayFeatures,
null,
2
);
});
</script>
</body>
</html>
このコードスニペットは、
YOUR_MAPBOX_ACCESS_TOKEN
をあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。import React, { useEffect, useRef, useState } from 'react';
import mapboxgl from 'mapbox-gl';
import 'mapbox-gl/dist/mapbox-gl.css';
const MapboxExample = () => {
const mapContainerRef = useRef();
const mapRef = useRef();
const [displayFeatures, setDisplayFeatures] = useState();
useEffect(() => {
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = 'YOUR_MAPBOX_ACCESS_TOKEN';
mapRef.current = new mapboxgl.Map({
container: mapContainerRef.current,
style: 'mapbox://styles/mapbox/streets-v12',
center: [-96, 37.8],
zoom: 3
});
mapRef.current.on('mousemove', (e) => {
const features = mapRef.current.queryRenderedFeatures(e.point);
const displayProperties = [
'type',
'properties',
'id',
'layer',
'source',
'sourceLayer',
'state'
];
const formattedFeatures = features.map((feat) => {
const displayFeat = {};
displayProperties.forEach((prop) => {
displayFeat[prop] = feat[prop];
});
return displayFeat;
});
setDisplayFeatures(formattedFeatures);
});
}, []);
return (
<>
<div
id="map"
ref={mapContainerRef}
style={{ cursor: 'crosshair', height: '100%' }}
></div>
<pre
id="features"
style={{
position: 'absolute',
top: 0,
right: 0,
bottom: 0,
width: '50%',
overflow: 'auto',
background: 'rgba(255, 255, 255, 0.8)'
}}
>
{JSON.stringify(displayFeatures, null, 2)}
</pre>
</>
);
};
export default MapboxExample;
このコードスニペットは、
YOUR_MAPBOX_ACCESS_TOKEN
をあなたのMapboxアカウントのアクセストークンに置き換えるまで、期待通りに動作しません。このexampleは役に立ちましたか?