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zhongjin
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docs/guides/quickstart-example.html
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203
docs/guides/quickstart-example.html
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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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<!-- 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="https://cartodb-libs.global.ssl.fastly.net/carto.js/%VERSION%/carto.min.js"></script>
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<!-- Fonts -->
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<link href='https://fonts.googleapis.com/css?family=Open+Sans:300,400,600,700' rel='stylesheet' type='text/css'>
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<style>
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* { margin:0; padding:0; }
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html { box-sizing:border-box; height:100%; }
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body { background:#f2f6f9; height:100%; font-family:"Open sans", Helvetica, Arial, sans-serif; }
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#container { display:flex; width:100%; height:100%; }
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#map { flex:1; margin:10px; }
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#widgets { width:300px; margin:10px 10px 10px 0; }
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.widget { background:white; padding:10px; margin-bottom:10px; }
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.widget h1 { font-size:1.2em; }
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.widget-formula .result { font-size:2em; }
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</style>
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</head>
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<body>
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<div id="container">
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<div id="map"></div>
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<div id="widgets">
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<div id="countriesWidget" class="widget">
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<h1>European countries</h1>
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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>
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<div id="avgPopulationWidget" class="widget widget-formula">
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<h1>Average population</h1>
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<p><span class="js-average-population result">xxx</span> inhabitants</p>
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</div>
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</div>
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</div>
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<script>
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const map = L.map('map').setView([50, 15], 4);
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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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var 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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const europeanCountriesDataset = new carto.source.Dataset(`
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ne_adm0_europe
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`);
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const europeanCountriesStyle = new carto.style.CartoCSS(`
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#layer {
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polygon-fill: #162945;
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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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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: 8;
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marker-fill: #FF583E;
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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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client.addLayers([europeanCountries, populatedPlaces]);
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client.getLeafletLayer().addTo(map);
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const popup = L.popup({ closeButton: false });
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populatedPlaces.on(carto.layer.events.FEATURE_OVER, 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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populatedPlaces.on(carto.layer.events.FEATURE_OUT, featureEvent => {
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popup.removeFrom(map);
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});
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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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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('#avgPopulationWidget');
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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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client.addDataview(averagePopulation);
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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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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 widgetDom = document.querySelector('#countriesWidget');
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const countriesDom = widgetDom.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: #162945;
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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: #CDCDCD;
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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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let query = `
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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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if (admin) {
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query = `
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SELECT *
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FROM ne_10m_populated_places_simple
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WHERE adm0name='${admin}'
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`;
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}
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populatedPlacesSource.setQuery(query);
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}
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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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