Backend API
$(() => {
$('#treemap').dxTreeMap({
dataSource: citiesPopulation,
size: {
height: 440,
},
title: {
text: 'The Most Populated Cities by Continents',
placeholderSize: 80,
},
colorizer: {
palette: 'soft',
},
interactWithGroup: true,
maxDepth: 2,
onClick(e) {
e.node.drillDown();
},
onDrill(e) {
const markup = $('#drill-down-title').empty();
let node;
for (node = e.node.getParent(); node; node = node.getParent()) {
markup.prepend(' > ').prepend($('<span />')
.addClass('link')
.text(node.label() || 'All Continents')
.data('node', node)
.on('dxclick', onLinkClick));
}
if (markup.children().length) {
markup.append(e.node.label());
}
},
});
function onLinkClick(e) {
$(e.target).data('node').drillDown();
}
});
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=5.0" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script>window.jQuery || document.write(decodeURIComponent('%3Cscript src="js/jquery.min.js"%3E%3C/script%3E'))</script>
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/25.1.6/css/dx.light.css" />
<script src="js/dx.all.js?v=25.1.6"></script>
<script src="data.js"></script>
<link rel="stylesheet" type="text/css" href="styles.css" />
<script src="index.js"></script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="treemap"></div>
<div id="drill-down-title"></div>
</div>
</body>
</html>
#drill-down-title {
position: absolute;
top: 50px;
height: 36px;
width: 100%;
text-align: center;
}
.link {
color: #337ab7;
text-decoration: underline;
cursor: pointer;
}
const citiesPopulation = [{
name: 'Africa',
items: [{
name: 'Nigeria',
items: [{
name: 'Lagos',
value: 21324000,
}, {
name: 'Kano',
value: 3626068,
}, {
name: 'Ibadan',
value: 3200000,
}, {
name: 'Abuja',
value: 3000000,
}, {
name: 'Kaduna',
value: 1652844,
}, {
name: 'Port Harcourt',
value: 1320214,
}, {
name: 'Aba',
value: 1300000,
}, {
name: 'Ogbomosho',
value: 1200000,
}, {
name: 'Maiduguri',
value: 1197497,
}],
}, {
name: 'Egypt',
items: [{
name: 'Cairo',
value: 9278441,
}, {
name: 'Alexandria',
value: 4546231,
}, {
name: 'Giza',
value: 4239988,
}, {
name: 'Shubra El-Kheima',
value: 3072951,
}, {
name: 'Port Said',
value: 1607353,
}, {
name: 'Suez',
value: 1347352,
}],
}, {
name: 'Congo',
items: [{
name: 'Kinshasa',
value: 9735000,
}, {
name: 'Lubumbashi',
value: 1786397,
}, {
name: 'Mbuji-Mayi',
value: 1680991,
}, {
name: 'Kananga',
value: 1061181,
}, {
name: 'Bukavu',
value: 1012053,
}, {
name: 'Kisangani',
value: 935977,
}],
}, {
name: 'Morocco',
items: [{
name: 'Casablanca',
value: 3359818,
}, {
name: 'Fès',
value: 1112072,
}, {
name: 'Tangier',
value: 947952,
}, {
name: 'Marrakech',
value: 928850,
}, {
name: 'Salé',
value: 920403,
}],
}],
}, {
name: 'Asia',
items: [{
name: 'China',
items: [{
name: 'Shanghai',
value: 24256800,
}, {
name: 'Beijing',
value: 21516000,
}, {
name: 'Chongqing',
value: 18384100,
}, {
name: 'Chengdu',
value: 17677122,
}, {
name: 'Tianjin',
value: 15200000,
}, {
name: 'Guangzhou',
value: 13080500,
}, {
name: 'Shenzhen',
value: 10630000,
}],
}, {
name: 'Pakistan',
items: [{
name: 'Karachi',
value: 23500000,
}, {
name: 'Faisalabad',
value: 6418745,
}, {
name: 'Lahore',
value: 6318745,
}, {
name: 'Rawalpindi',
value: 3363911,
}, {
name: 'Hyderabad',
value: 3429471,
}, {
name: 'Multan',
value: 2050000,
}],
}, {
name: 'India',
items: [{
name: 'Delhi',
value: 16787941,
}, {
name: 'Mumbai',
value: 12478447,
}, {
name: 'Bengaluru',
value: 8425970,
}, {
name: 'Hyderabad',
value: 7749334,
}, {
name: 'Chennai',
value: 7088000,
}, {
name: 'Ahmedabad',
value: 5577940,
}],
}, {
name: 'Japan',
items: [{
name: 'Tokyo',
value: 9262046,
}, {
name: 'Yokohama',
value: 3697894,
}, {
name: 'Osaka',
value: 2668586,
}, {
name: 'Nagoya',
value: 2283289,
}, {
name: 'Sapporo',
value: 1918096,
}],
}],
}, {
name: 'Europe',
items: [{
name: 'Turkey',
items: [{
name: 'Istanbul',
value: 14160467,
}, {
name: 'Ankara',
value: 4470800,
}, {
name: 'İzmir',
value: 3276815,
}, {
name: 'Bursa',
value: 1957247,
}, {
name: 'Adana',
value: 1717473,
}],
}, {
name: 'Russia',
items: [{
name: 'Moscow',
value: 12197596,
}, {
name: 'Saint Petersburg',
value: 5191690,
}, {
name: 'Novosibirsk',
value: 1473754,
}, {
name: 'Yekaterinburg',
value: 1428042,
}],
}, {
name: 'United Kingdom',
items: [{
name: 'London',
value: 8538689,
}, {
name: 'Birmingham',
value: 1101360,
}, {
name: 'Glasgow',
value: 599650,
}, {
name: 'Liverpool',
value: 473073,
}],
}, {
name: 'Germany',
items: [{
name: 'Berlin',
value: 3517424,
}, {
name: 'Hamburg',
value: 1686100,
}, {
name: 'Munich',
value: 1185400,
}, {
name: 'Cologne',
value: 1046680,
}, {
name: 'Frankfurt',
value: 717624,
}],
}, {
name: 'France',
items: [{
name: 'Paris',
value: 2240621,
}, {
name: 'Marseille',
value: 852516,
}, {
name: 'Lyon',
value: 500715,
}, {
name: 'Toulouse',
value: 461190,
}],
}],
}, {
name: 'North America',
items: [{
name: 'Mexico',
items: [{
name: 'Mexico City',
value: 8874724,
}, {
name: 'Ecatepec de Morelos',
value: 1742023,
}, {
name: 'Puebla',
value: 1508707,
}, {
name: 'Guadalajara',
value: 1506359,
}, {
name: 'Juárez',
value: 1409987,
}, {
name: 'Tijuana',
value: 1399282,
}, {
name: 'León',
value: 1281434,
}],
}, {
name: 'United States',
items: [{
name: 'New York City',
value: 8550405,
}, {
name: 'Los Angeles',
value: 3884307,
}, {
name: 'Chicago',
value: 2722389,
}, {
name: 'Houston',
value: 2296224,
}, {
name: 'Philadelphia',
value: 1567442,
}, {
name: 'Phoenix',
value: 1563025,
}, {
name: 'San Antonio',
value: 1469845,
}, {
name: 'San Diego',
value: 1394928,
}],
}, {
name: 'Canada',
items: [{
name: 'Toronto',
value: 2808503,
}, {
name: 'Montreal',
value: 1731245,
}, {
name: 'Calgary',
value: 1096833,
}, {
name: 'Ottawa',
value: 956710,
}, {
name: 'Edmonton',
value: 895000,
}, {
name: 'Mississauga',
value: 713443,
}],
}, {
name: 'Cuba',
items: [{
name: 'Havana',
value: 2135498,
}, {
name: 'Santiago de Cuba',
value: 425851,
}, {
name: 'Camagüey',
value: 305845,
}],
}],
}, {
name: 'South America',
items: [{
name: 'Brazil',
items: [{
name: 'São Paulo',
value: 11895893,
}, {
name: 'Rio de Janeiro',
value: 6429923,
}, {
name: 'Salvador',
value: 2902927,
}, {
name: 'Brasília',
value: 2914830,
}, {
name: 'Fortaleza',
value: 2591188,
}, {
name: 'Belo Horizonte',
value: 2513451,
}, {
name: 'Manaus',
value: 2094391,
}],
}, {
name: 'Peru',
items: [{
name: 'Lima',
value: 8693387,
}, {
name: 'Callao',
value: 1010315,
}, {
name: 'Arequipa',
value: 869351,
}, {
name: 'Trujillo',
value: 788236,
}, {
name: 'Chiclayo',
value: 600440,
}],
}, {
name: 'Colombia',
items: [{
name: 'Bogotá',
value: 7776845,
}, {
name: 'Medellín',
value: 2441123,
}, {
name: 'Cali',
value: 2400653,
}, {
name: 'Barranquilla',
value: 1214253,
}, {
name: 'Cartagena',
value: 959594,
}],
}, {
name: 'Chile',
items: [{
name: 'Santiago',
value: 5507282,
}, {
name: 'Puente Alto',
value: 610118,
}, {
name: 'Maipú',
value: 468390,
}],
}, {
name: 'Venezuela',
items: [{
name: 'Caracas',
value: 3289886,
}, {
name: 'Maracaibo',
value: 1653211,
}, {
name: 'Barquisimeto',
value: 1116182,
}, {
name: 'Valencia',
value: 901900,
}, {
name: 'Ciudad Guayana',
value: 877547,
}],
}],
}];
In this demo, you can click/tap a group of TreeMap tiles to drill down. Once you go down a level, navigation links appear at the top of the TreeMap. Use them to drill back up. To implement this technique, follow the steps below:
-
Set the interactWithGroup property to
trueto force the control to hot-track entire groups instead of individual items. -
Call the node.drillDown method in the TreeMap onClick handler.
-
To enable drill-up functionality, generate links in the onDrill handler. Call the node.drillDown method on link clicks. Inspect the code below for implementation details.