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<!DOCTYPE html>
<html lang="en">
<head>
<title>Update layer based on map style - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<link rel="shortcut icon" href="/favicon.ico"/>
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to monitor the maps style and update the style of a layer accordingly." />
<meta name="keywords" content="Microsoft maps, map, gis, API, SDK, markers, pins, pushpins, symbols, layer, icon, image, styledata" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource, layer;
function GetMap() {
//Point the Azure Maps domain to the US Azure Gov Cloud domain.
atlas.setDomain('atlas.azure.us');
//Initialize a map instance.
map = new atlas.Map('myMap', {
center: [-73.985708, 40.75773],
zoom: 12,
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Azure Active Directory authentication.
authType: 'anonymous',
clientId: 'c9f2f391-13f1-407b-a4a5-f0a241bacfbf', //Your Azure Active Directory client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Azure Active Directory Token.
var tokenServiceUrl = 'https://azuremapscodesamples.azurewebsites.us/Common/TokenService.ashx';
fetch(tokenServiceUrl).then(r => r.text()).then(token => resolve(token));
}
//Alternatively, use an Azure Maps key. Get an Azure Maps key at https://azure.com/maps. NOTE: The primary key should be used as the key.
//authType: 'subscriptionKey',
//subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Create a style control and add it to the map.
map.controls.add(new atlas.control.StyleControl(), {
position: 'top-right'
});
//Create a data source and add it to the map.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Create a point feature and add it to the data source.
datasource.add(new atlas.data.Feature(new atlas.data.Point([-73.985708, 40.75773]), {
title: 'Hi'
}));
//Add a layer for rendering point data as symbols. Apply any common styles that will not change when the map style changes.
layer = new atlas.layer.SymbolLayer(datasource, null, {
textOptions: {
//Displaye the "title" property of the feature.
textField: ['get', 'title'],
//Offset the text so that it appears on top of the icon.
offset: [0, -1]
}
});
//Update the layer based on the maps initial style.
mapStyleChanged();
//Add the layer to the map.
map.layers.add(layer);
//Add an event to monitor changes in the map style.
map.events.add('styledata', mapStyleChanged);
});
}
function mapStyleChanged() {
var style = map.getStyle().style;
//Style the symbol layer differently depending on if the map style is light or dark.
switch (style) {
//Dark styles.
case 'grayscale_dark':
case 'highcontrast_dark':
case 'night':
case 'satellite_roads_labels':
case 'satellite':
layer.setOptions({
iconOptions: {
image: 'marker-yellow'
},
textOptions: {
color: '#000000'
}
});
break;
//Light styles.
case 'road':
default: //Specify a default as new map styles may be added in the future.
layer.setOptions({
iconOptions: {
image: 'marker-blue'
},
textOptions: {
color: '#FFFFFF'
}
});
break;
}
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend><h1 style="font-size:16px">Update layer based on map style</h1></legend>
This sample shows how to monitor the maps style and update the style of a layer accordingly.
The map monitors the 'styledata' event to keep track of when the base map style changes.
In this sample a symbol layer is updated such that when the map style is dark, a yellow icon
with black text is displayed, when the map style is light, a blue icon with white text is displayed.
</fieldset>
</body>
</html>