Getting started (1)Display a mapStyles (11)Add a default markerAdd an animated icon to the mapAdd a generated icon to the mapAdd a stretchable image to the mapGenerate and add a missing icon to the mapAdd an icon to the mapDisplay a map with a custom styleRender world copiesDisplay a satellite mapChange a map's styleDisplay a mapLayers (40)Extrude polygons for 3D indoor mappingDisplay buildings in 3DAdd a 3D modelAdd an animated icon to the mapAdd a generated icon to the mapAdd a stretchable image to the mapGenerate and add a missing icon to the mapAdd an icon to the mapAdjust a layer's opacityAnimate a lineAnimate a series of imagesAnimate a pointChange building color based on zoom levelChange the case of labelsDisplay HTML clusters with custom propertiesCreate and style clustersChange a layer's color with buttonsAdd a custom style layerStyle circles with a data-driven propertyStyle lines with a data-driven propertyDisplay and style rich text labelsAdd a pattern to a polygonAdd a new layer below labelsAdd a GeoJSON lineDraw GeoJSON pointsAdd a GeoJSON polygonCreate a heatmap layerAdd hillshadingAdd an imageCreate a gradient line using an expressionDisplay line that crosses 180th meridianAdd multiple geometries from one GeoJSON sourceStyle ocean depth dataShow and hide layersChange worldview of administrative boundariesUpdate a choropleth layer by zoom levelVariable label placementAdd a videoVisualize population densityUse a fallback imageSources (16)Animate a lineAnimate a series of imagesAnimate a pointAdd a canvas sourceJoin local JSON data with vector tile geometriesAdd hillshadingAdd an imageDisplay line that crosses 180th meridianAdd live realtime dataUpdate a feature in realtimeAdd a raster tile sourceAdd a third party vector tile sourceCreate a time sliderAdd a vector tile sourceAdd a videoAdd a WMS sourceUser interaction (27)Adjust a layer's opacityCustomize camera animationsCenter the map on a clicked symbolChange a layer's color with buttonsAnimate 3D buildings based on ambient soundsDisable map rotationCreate a draggable MarkerFilter features within map viewFilter symbols by text inputFilter symbols by toggling a listCreate a hover effectDisplay a non-interactive mapChange a map's languageMeasure distancesGet coordinates of the mouse pointerHighlight features containing similar dataSelect features around a clicked pointGet features under the mouse pointerRestrict map panning to an areaChange a map's styleToggle interactionsCreate a time sliderChange worldview of administrative boundariesCreate a draggable pointUpdate a choropleth layer by zoom levelHighlight features within a bounding boxFit to the bounds of a LineStringCamera (13)Animate map camera around a pointAnimate a point along a routeCustomize camera animationsCenter the map on a clicked symbolFit a map to a bounding boxSlowly fly to a locationFly to a locationNavigate the map with game-like controlsJump to a series of locationsOffset the vanishing point using paddingPlay map locations as a slideshowFly to a location based on scroll positionSet pitch and bearingControls and overlays (17)Animate a markerChange the default position for attributionAdd custom icons with MarkersDisable scroll zoomView a fullscreen mapLocate the userSwipe between mapsDisplay driving directionsShow drawn polygon areaAdd a geocoderAdd a marker using a place nameDisplay map navigation controlsShow polygon information on clickDisplay a popup on clickDisplay a popup on hoverDisplay a popupAttach a popup to a marker instanceGeocoder (10)Supplement forward geocoding search results from another data sourceUse a custom render function with a geocoderAccept coordinates as input to a geocoderLimit geocoder results to a named regionUse the geocoder without a mapPlace the geocoder input outside the mapUse a custom camera animation with a geocoderAdd a geocoderLocalize the geocoder to a given languageSet a point after Geocoder resultBrowser support (1)Check if Mapbox GL JS is supportedInternationalization support (2)Use locally generated ideographsAdd support for right-to-left scripts

Create a hover effect

Using events and feature states to create a per feature hover effect.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Create a hover effect</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.12.0/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.12.0/mapbox-gl.css" rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<div id="map"></div>
<script>
// TO MAKE THE MAP APPEAR YOU MUST
// ADD YOUR ACCESS TOKEN FROM
// https://account.mapbox.com
mapboxgl.accessToken = '<your access token here>';
var map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/streets-v11',
center: [-100.486052, 37.830348],
zoom: 2
});
var hoveredStateId = null;
map.on('load', function () {
map.addSource('states', {
'type': 'geojson',
'data':
'https://docs.mapbox.com/mapbox-gl-js/assets/us_states.geojson'
});
// The feature-state dependent fill-opacity expression will render the hover effect
// when a feature's hover state is set to true.
map.addLayer({
'id': 'state-fills',
'type': 'fill',
'source': 'states',
'layout': {},
'paint': {
'fill-color': '#627BC1',
'fill-opacity': [
'case',
['boolean', ['feature-state', 'hover'], false],
1,
0.5
]
}
});
map.addLayer({
'id': 'state-borders',
'type': 'line',
'source': 'states',
'layout': {},
'paint': {
'line-color': '#627BC1',
'line-width': 2
}
});
// When the user moves their mouse over the state-fill layer, we'll update the
// feature state for the feature under the mouse.
map.on('mousemove', 'state-fills', function (e) {
if (e.features.length > 0) {
if (hoveredStateId) {
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: false }
);
}
hoveredStateId = e.features[0].id;
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: true }
);
}
});
// When the mouse leaves the state-fill layer, update the feature state of the
// previously hovered feature.
map.on('mouseleave', 'state-fills', function () {
if (hoveredStateId) {
map.setFeatureState(
{ source: 'states', id: hoveredStateId },
{ hover: false }
);
}
hoveredStateId = null;
});
});
</script>
</body>
</html>
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