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zhongjin
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<!DOCTYPE html>
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<html>
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<head>
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<title>Guide | CARTO</title>
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<meta name="viewport" content="initial-scale=1.0">
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<meta charset="utf-8">
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<link href="https://fonts.googleapis.com/css?family=Montserrat:400,600,700|Open+Sans:300,400,600" rel="stylesheet">
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<!-- Include Leaflet -->
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<script src="https://unpkg.com/leaflet/dist/leaflet.js"></script>
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<link href="https://unpkg.com/leaflet/dist/leaflet.css" rel="stylesheet">
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<!-- Include CARTO.js -->
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<script src="../../../dist/public/carto.js"></script>
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<link href="../style.css" rel="stylesheet">
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</head>
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<body>
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<div id="map"></div>
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<aside class="toolbox">
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<div class="box">
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<header>
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<h1>Guide</h1>
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<button class="github-logo js-source-link"></button>
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</header>
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<section>
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<p class="description open-sans">Full reference guide example.</p>
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<div class="separator"></div>
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<section class="usage">
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<header>USAGE</header>
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<p class="open-sans">Select a country</p>
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</section>
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<div id="controls">
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<h2 class="h2">European countries</h2>
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<select class="js-countries">
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<option value="">All</option>
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</select>
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<div id="info"></div>
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</div>
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</section>
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<footer class="js-footer"></footer>
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</div>
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<div class="box widget">
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<h2 class="h2">Average population</h2>
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<p class="result open-sans"><span class="js-average-population">xxx</span> <small>inhabitants</small></p>
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</div>
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</aside>
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<script>
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// 1. Setting up the Leaflet Map
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// 1.1 Creating the Leaflet Map
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const map = L.map('map').setView([50, 15], 4);
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map.scrollWheelZoom.disable();
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// 1.2 Adding basemap and labels layers
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// Adding Voyager Basemap
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L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_nolabels/{z}/{x}/{y}.png', {
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maxZoom: 18
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}).addTo(map);
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// Adding Voyager Labels
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L.tileLayer('https://{s}.basemaps.cartocdn.com/rastertiles/voyager_only_labels/{z}/{x}/{y}.png', {
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maxZoom: 18,
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zIndex: 10
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}).addTo(map);
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// 2 Defining a carto.Client
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const client = new carto.Client({
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apiKey: 'default_public',
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username: 'cartojs-test'
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});
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// 3. Displaying countries and cities on the map
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// 3.1 Defining the layers
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// European Countries layer
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const europeanCountriesDataset = new carto.source.Dataset('ne_adm0_europe');
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const europeanCountriesStyle = new carto.style.CartoCSS(`
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#layer {
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polygon-fill: #826DBA;
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polygon-opacity: 0.5;
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::outline {
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line-width: 1;
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line-color: #FFFFFF;
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line-opacity: 0.5;
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}
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}
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`);
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const europeanCountries = new carto.layer.Layer(europeanCountriesDataset, europeanCountriesStyle);
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// Europe cities layer
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const populatedPlacesSource = new carto.source.SQL(`
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SELECT *
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FROM ne_10m_populated_places_simple
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WHERE adm0name IN (SELECT admin FROM ne_adm0_europe)
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`);
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const populatedPlacesStyle = new carto.style.CartoCSS(`
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#layer {
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marker-width: 7;
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marker-fill: #EE4D5A;
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marker-fill-opacity: 0.9;
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marker-line-width: 0.5;
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marker-line-color: #FFFFFF;
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marker-line-opacity: 1;
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marker-type: ellipse;
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marker-allow-overlap: false;
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}
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`);
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const populatedPlaces = new carto.layer.Layer(populatedPlacesSource, populatedPlacesStyle, {
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featureOverColumns: ['name']
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});
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// 3.2 Adding the layers to the client
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client.addLayers([europeanCountries, populatedPlaces]);
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// 3.3. Adding the layers to the map
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client.getLeafletLayer().addTo(map);
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// 4. Setting up tooltips
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// 4.1 Showing the tooltip when user mouses over a city
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const popup = L.popup({ closeButton: false });
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populatedPlaces.on('featureOver', featureEvent => {
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popup.setLatLng(featureEvent.latLng);
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if (!popup.isOpen()) {
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popup.setContent(featureEvent.data.name);
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popup.openOn(map);
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}
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});
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// 4.2 Hiding the tooltip
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populatedPlaces.on('featureOut', featureEvent => {
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popup.removeFrom(map);
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});
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// 5 Creating a formula widget
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// 5.1 Defining a formula dataview
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const averagePopulation = new carto.dataview.Formula(populatedPlacesSource, 'pop_max', {
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operation: carto.operation.AVG
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});
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// 5.2 Listening to data changes on the dataview
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averagePopulation.on('dataChanged', data => {
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refreshAveragePopulationWidget(data.result);
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});
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function refreshAveragePopulationWidget(avgPopulation) {
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const widgetDom = document.querySelector('.box.widget');
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const averagePopulationDom = widgetDom.querySelector('.js-average-population');
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averagePopulationDom.innerText = Math.floor(avgPopulation);
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}
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// 5.3 Adding the dataview to the client
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client.addDataview(averagePopulation);
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// 6 Creating a country selector widget
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// 6.1 Defining a category dataview
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const countriesDataview = new carto.dataview.Category(europeanCountriesDataset, 'admin', {
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limit: 100
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});
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// 6.2 Listening to data changes on the dataview
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countriesDataview.on('dataChanged', data => {
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const countryNames = data.categories.map(category => category.name).sort();
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refreshCountriesWidget(countryNames);
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});
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function refreshCountriesWidget(adminNames) {
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const asideElement = document.querySelector('aside.toolbox');
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const countriesDom = asideElement.querySelector('.js-countries');
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countriesDom.onchange = event => {
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const admin = event.target.value;
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highlightCountry(admin);
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filterPopulatedPlacesByCountry(admin);
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};
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// Fill in the list of countries
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adminNames.forEach(admin => {
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const option = document.createElement('option');
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option.innerHTML = admin;
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option.value = admin;
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countriesDom.appendChild(option);
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});
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}
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function highlightCountry(admin) {
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let cartoCSS = `
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#layer {
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polygon-fill: #826DBA;
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polygon-opacity: 0.5;
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::outline {
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line-width: 1;
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line-color: #FFFFFF;
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line-opacity: 0.5;
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}
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}
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`;
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if (admin) {
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cartoCSS = `
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${cartoCSS}
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#layer[admin!='${admin}'] {
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polygon-fill: #e5e5e5;
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}
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`;
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}
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europeanCountriesStyle.setContent(cartoCSS);
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}
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function filterPopulatedPlacesByCountry(admin) {
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const query = admin
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? `SELECT * FROM ne_10m_populated_places_simple WHERE adm0name='${admin}'`
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: 'SELECT * FROM ne_10m_populated_places_simple WHERE adm0name IN (SELECT admin FROM ne_adm0_europe)';
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populatedPlacesSource.setQuery(query);
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}
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// 6.3 Adding the dataview to the client
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client.addDataview(countriesDataview);
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</script>
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</body>
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</html>
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