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Create HTML legend.html
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<!DOCTYPE html>
<html lang="en">
<head>
<title>Create HTML legend - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how to create legends using custom HTML with the legend control." />
<meta name="keywords" content="Microsoft maps, maps, map, API, SDK, GIS, legend, legend control" />
<meta name="author" content="Microsoft Azure Maps" /><meta name="version" content="1.0" />
<meta name="screenshot" content="screenshot.jpg" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.min.css"
type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/3/atlas.js"></script>
<!-- Load in the JavaScript and CSS files that has our custom control. -->
<link rel="stylesheet" href="/lib/azure-maps/azure-maps-layer-legend.min.css" type="text/css" />
<script src="/lib/azure-maps/azure-maps-layer-legend.min.js"></script>
<!-- Load any 3rd party libraries desired. In this case Chart.js -->
<script src="https://cdn.jsdelivr.net/npm/chart.js@3.5.1/dist/chart.min.js"></script>
<script>
var map, legend;
function getMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
view: 'Auto',
//Add authentication details for connecting to Azure Maps.
authOptions: {
//Use Microsoft Entra ID authentication.
authType: 'anonymous',
clientId: 'e6b6ab59-eb5d-4d25-aa57-581135b927f0', //Your Azure Maps client id for accessing your Azure Maps account.
getToken: function (resolve, reject, map) {
//URL to your authentication service that retrieves an Microsoft Entra ID Token.
var tokenServiceUrl = 'https://samples.azuremaps.com/api/GetAzureMapsToken';
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 canvas element to use with chart.js
var chartCanvas = document.createElement('canvas');
chartCanvas.height = 200;
chartCanvas.width = 200;
chartCanvas.style.padding = '10px';
//Add the legend control to the map.
legend = new atlas.control.LegendControl({
title: 'My Legend',
legends: [{
type: 'html',
subtitle: 'Chart.js HTML legend',
footer: 'This chart was created by adding a Canvas element to the legend and using <a href="https://www.chartjs.org/" target="_blank">Chart.js</a> to create a chart on the canvas.',
html: chartCanvas
}]
});
//Add the legend to the map.
map.controls.add(legend, {
position: 'bottom-left'
});
//Chart.js requires the canvas to be added to the page DOM before drawing a chart. Thus, run chart.js code after Legend control/canvas has been added to the map.
var myChart = new Chart(chartCanvas.getContext('2d'), {
type: 'radar',
data: {
labels: [
'Eating',
'Drinking',
'Sleeping',
'Designing',
'Coding',
'Cycling',
'Running'
],
datasets: [{
label: 'My First Dataset',
data: [65, 59, 90, 81, 56, 55, 40],
fill: true,
backgroundColor: 'rgba(255, 99, 132, 0.2)',
borderColor: 'rgb(255, 99, 132)',
pointBackgroundColor: 'rgb(255, 99, 132)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgb(255, 99, 132)'
}, {
label: 'My Second Dataset',
data: [28, 48, 40, 19, 96, 27, 100],
fill: true,
backgroundColor: 'rgba(54, 162, 235, 0.2)',
borderColor: 'rgb(54, 162, 235)',
pointBackgroundColor: 'rgb(54, 162, 235)',
pointBorderColor: '#fff',
pointHoverBackgroundColor: '#fff',
pointHoverBorderColor: 'rgb(54, 162, 235)'
}]
}
});
//Load some mock data for the example.
loadMockData();
});
}
function loadMockData() {
//Create a data source and add it to the map.
var source = new atlas.source.DataSource();
map.sources.add(source);
//Create mock data and add to the data source.
var mockData = [];
for(var i=0;i<100; i++){
mockData.push( new atlas.data.Feature(new atlas.data.Point([Math.random() * 360 - 180, Math.random() * 170 - 85]), { dataset: i%2 + 1}));
}
source.add(mockData);
//Add a layer to render the mock data.
map.layers.add(new atlas.layer.BubbleLayer(source, null, {
radius: 5,
createIndicators: true, // to enable bubble layer a11y feature
color: [
'match',
['get', 'dataset'],
1, 'rgba(255, 99, 132, 0.2)',
2, 'rgba(54, 162, 235, 0.2)',
'black'
],
strokeColor: [
'match',
['get', 'dataset'],
1, 'rgb(255, 99, 132)',
2, 'rgb(54, 162, 235)',
'black'
]
}));
}
</script>
<style>
.simple-legend {
color: red;
}
</style>
</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">Create HTML legend</h1>
</legend>
This sample shows how to create legends using custom HTML with the legend control.
HTML legends can be created by passing in an HTML string, or a DOM element.
This sample uses the open source <a href="https://github.com/Azure-Samples/azure-maps-layer-legend" target="_blank">Azure Maps Layer & Legend Control module</a>
</fieldset>
</body>
</html>