layer-data-quakes-red

Sample code supporting Google Maps Platform JavaScript API documentation. author(s): Geo Developer IX Documentation Team

HTML

<!doctype html>
<!--
 @license
 Copyright 2019 Google LLC. All Rights Reserved.
 SPDX-License-Identifier: Apache-2.0
-->

<html>
  <head>
    <title>Simple Data Layer: Earthquakes</title>

    <script>
      // prettier-ignore
      (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
            });
    </script>
  </head>
  <body>
    <gmp-map center="20,-160" zoom="2"></gmp-map>
  </body>
</html>

CSS

/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
gmp-map {
  height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

JavaScript

/**
 * @license
 * Copyright 2019 Google LLC. All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 */

const ASSET_BASE_URL = new URL(
  'https://maps-docs-team.web.app/samples/layer-data-quakes-red/dist/'
);

let innerMap;

async function init() {
  const [{ SymbolPath }] = await Promise.all([
    google.maps.importLibrary('core'),
    google.maps.importLibrary('maps'),
  ]);

  const mapElement = document.querySelector('gmp-map');

  innerMap = mapElement.innerMap;

  // Get the earthquake data (JSONP format)
  // This feed is a copy from the USGS feed, you can find the originals here:
  //   http://earthquake.usgs.gov/earthquakes/feed/v1.0/geojson.php
  const script = document.createElement('script');

  script.setAttribute('src', new URL('./quakes.geo.js', ASSET_BASE_URL).href);

  document.getElementsByTagName('head')[0].appendChild(script);

  // Add a basic style.
  innerMap.data.setStyle((feature) => {
    const mag = Math.exp(parseFloat(feature.getProperty('mag'))) * 0.1;
    return {
      icon: {
        path: SymbolPath.CIRCLE,
        scale: mag,
        fillColor: '#f00',
        fillOpacity: 0.35,
        strokeWeight: 0,
      },
    };
  });
}

// Defines the callback function referenced in the jsonp file.

function earthquakeDataLoad(data) {
  innerMap.data.addGeoJson(data);
}

window.earthquakeDataLoad = earthquakeDataLoad;
void init();
export {};