Lập bản đồ mật khẩu

Chọn nền tảng: iOS JavaScript

Bản đồ choropleth là một loại bản đồ theo chủ đề, trong đó các khu vực hành chính được tô màu hoặc tô bóng theo giá trị dữ liệu. Bạn có thể sử dụng google.maps.FeatureStyleFunction để tạo kiểu cho bản đồ dựa trên tập dữ liệu, trong đó mỗi khu vực hành chính được liên kết với một dải giá trị số. Bản đồ mẫu sau đây cho thấy bản đồ choropleth mô tả dữ liệu dân số của tiểu bang cho Hoa Kỳ.

Trong ví dụ này, dữ liệu bao gồm một mảng các cặp khoá-giá trị, khớp với tên hiển thị của từng trạng thái với giá trị tập hợp dạng số. maps.FeatureStyleFunction tô màu có điều kiện từng khu vực dựa trên các giá trị trong mảng.

TypeScript

featureLayer.style = featureStyleFunctionOptions => {
    const placeFeature = featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
    const population = states[placeFeature.placeId];

    let fillColor;
    // Specify colors using any of the following:
    // * Named ('green')
    // * Hexadecimal ('#FF0000')
    // * RGB ('rgb(0, 0, 255)')
    // * HSL ('hsl(60, 100%, 50%)')

    if (population < 2000000) {
        fillColor = 'green'
    } else if (population < 5000000) {
        fillColor = 'red'
    } else if (population < 10000000) {
        fillColor = 'blue'
    } else if (population < 40000000) {
        fillColor = 'yellow'
    }
    return {
        fillColor,
        fillOpacity: 0.5
    }
}

JavaScript

featureLayer.style = (featureStyleFunctionOptions) => {
  const placeFeature = featureStyleFunctionOptions.feature;
  const population = states[placeFeature.placeId];
  let fillColor;

  // Specify colors using any of the following:
  // * Named ('green')
  // * Hexadecimal ('#FF0000')
  // * RGB ('rgb(0, 0, 255)')
  // * HSL ('hsl(60, 100%, 50%)')
  if (population < 2000000) {
    fillColor = "green";
  } else if (population < 5000000) {
    fillColor = "red";
  } else if (population < 10000000) {
    fillColor = "blue";
  } else if (population < 40000000) {
    fillColor = "yellow";
  }
  return {
    fillColor,
    fillOpacity: 0.5,
  };
};

Đoạn mã mẫu hoàn chỉnh

TypeScript

async function initMap() {
    // Request needed libraries.
    const { Map } = await google.maps.importLibrary("maps") as google.maps.MapsLibrary;

    const map = new Map(document.getElementById('map') as HTMLElement, {
        center: { lat: 40.76, lng: -101.64 },
        zoom: 5,
        // In the cloud console, configure this Map ID with a style that enables the
        // "Administrative Area Level 1" feature layer.
        mapId: '7ba16be0c9375fa7',
    });

    const featureLayer = map.getFeatureLayer(google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1);

    featureLayer.style = featureStyleFunctionOptions => {
        const placeFeature = featureStyleFunctionOptions.feature as google.maps.PlaceFeature;
        const population = states[placeFeature.placeId];

        let fillColor;
        // Specify colors using any of the following:
        // * Named ('green')
        // * Hexadecimal ('#FF0000')
        // * RGB ('rgb(0, 0, 255)')
        // * HSL ('hsl(60, 100%, 50%)')

        if (population < 2000000) {
            fillColor = 'green'
        } else if (population < 5000000) {
            fillColor = 'red'
        } else if (population < 10000000) {
            fillColor = 'blue'
        } else if (population < 40000000) {
            fillColor = 'yellow'
        }
        return {
            fillColor,
            fillOpacity: 0.5
        }
    }
    // Population data by state.
    const states = {
        "ChIJdf5LHzR_hogR6czIUzU0VV4": 5039877, // Alabama
        "ChIJG8CuwJzfAFQRNduKqSde27w": 732673, // Alaska
        "ChIJaxhMy-sIK4cRcc3Bf7EnOUI": 7276316, // Arizona
        "ChIJYSc_dD-e0ocR0NLf_z5pBaQ": 3025891, // Arkansas
        "ChIJPV4oX_65j4ARVW8IJ6IJUYs": 39237836, // California
        "ChIJt1YYm3QUQIcR_6eQSTGDVMc": 5812069, // Colorado
        "ChIJpVER8hFT5okR5XBhBVttmq4": 3605597, // Connecticut
        "ChIJO9YMTXYFx4kReOgEjBItHZQ": 1003384, // Delaware
        "ChIJvypWkWV2wYgR0E7HW9MTLvc": 21781128, // Florida
        "ChIJV4FfHcU28YgR5xBP7BC8hGY": 10799566, // Georgia
        "ChIJBeB5Twbb_3sRKIbMdNKCd0s": 1441553, // Hawaii
        "ChIJ6Znkhaj_WFMRWIf3FQUwa9A": 1900923, // Idaho
        "ChIJGSZubzgtC4gRVlkRZFCCFX8": 12671469, // Illinois
        "ChIJHRv42bxQa4gRcuwyy84vEH4": 6805985, // Indiana
        "ChIJGWD48W9e7ocR2VnHV0pj78Y": 3193079, // Iowa
        "ChIJawF8cXEXo4cRXwk-S6m0wmg": 2934582, // Kansas
        "ChIJyVMZi0xzQogR_N_MxU5vH3c": 4509394, // Kentucky
        "ChIJZYIRslSkIIYRA0flgTL3Vck": 4624047, // Louisiana
        "ChIJ1YpTHd4dsEwR0KggZ2_MedY": 1372247, // Maine
        "ChIJ35Dx6etNtokRsfZVdmU3r_I": 6165129, // Maryland
        "ChIJ_b9z6W1l44kRHA2DVTbQxkU": 6984723, // Massachussetts
        "ChIJEQTKxz2qTE0Rs8liellI3Zc": 10050811, // Michigan
        "ChIJmwt4YJpbWE0RD6L-EJvJogI": 5707390, // Minnesota
        "ChIJGdRK5OQyKIYR2qbc6X8XDWI": 2949965, // Mississippi
        "ChIJfeMiSNXmwIcRcr1mBFnEW7U": 6168187, // Misssouri
        "ChIJ04p7LZwrQVMRGGwqz1jWcfU": 1104271, // Montana
        "ChIJ7fwMtciNk4cRxArzDwyQJ6E": 1963692, // Nebraska
        "ChIJcbTe-KEKmYARs5X8qooDR88": 3143991, // Nevada
        "ChIJ66bAnUtEs0wR64CmJa8CyNc": 1388992, // New Hampshire
        "ChIJn0AAnpX7wIkRjW0_-Ad70iw": 9267130, // New Jersey
        "ChIJqVKY50NQGIcRup41Yxpuv0Y": 2115877, // New Mexico
        "ChIJqaUj8fBLzEwRZ5UY3sHGz90": 19835913, // New York
        "ChIJgRo4_MQfVIgRGa4i6fUwP60": 10551162, // North Carolina
        "ChIJY-nYVxKD11IRyc9egzmahA0": 774948, // North Dakota
        "ChIJwY5NtXrpNogRFtmfnDlkzeU": 11780017, // Ohio
        "ChIJnU-ssRE5rIcRSOoKQDPPHF0": 3986639, // Oklahoma
        "ChIJVWqfm3xuk1QRdrgLettlTH0": 4246155, // Oregon
        "ChIJieUyHiaALYgRPbQiUEchRsI": 12964056, // Pennsylvania
        "ChIJD9cOYhQ15IkR5wbB57wYTh4": 1095610, // Rhode Island
        "ChIJ49ExeWml-IgRnhcF9TKh_7k": 5190705, // South Carolina
        "ChIJpTjphS1DfYcRt6SGMSnW8Ac": 895376, // South Dakota
        "ChIJA8-XniNLYYgRVpGBpcEgPgM": 6975218, // Tennessee
        "ChIJSTKCCzZwQIYRPN4IGI8c6xY": 29527941, // Texas
        "ChIJzfkTj8drTIcRP0bXbKVK370": 3337975, // Utah
        "ChIJ_87aSGzctEwRtGtUNnSJTSY": 645570, // Vermont
        "ChIJzbK8vXDWTIgRlaZGt0lBTsA": 8642274, // Virginia
        "ChIJ-bDD5__lhVQRuvNfbGh4QpQ": 7738692, // Washington
        "ChIJRQnL1KVUSogRQzrN3mjHALs": 1782959, // West Virginia
        "ChIJr-OEkw_0qFIR1kmG-LjV1fI": 5895908, // Wisconsin
        "ChIJaS7hSDTiXocRLzh90nkisCY": 578803, // Wyoming
    };
}

initMap();

JavaScript

async function initMap() {
  // Request needed libraries.
  const { Map } = await google.maps.importLibrary("maps");
  const map = new Map(document.getElementById("map"), {
    center: { lat: 40.76, lng: -101.64 },
    zoom: 5,
    // In the cloud console, configure this Map ID with a style that enables the
    // "Administrative Area Level 1" feature layer.
    mapId: "7ba16be0c9375fa7",
  });
  const featureLayer = map.getFeatureLayer(
    google.maps.FeatureType.ADMINISTRATIVE_AREA_LEVEL_1,
  );

  featureLayer.style = (featureStyleFunctionOptions) => {
    const placeFeature = featureStyleFunctionOptions.feature;
    const population = states[placeFeature.placeId];
    let fillColor;

    // Specify colors using any of the following:
    // * Named ('green')
    // * Hexadecimal ('#FF0000')
    // * RGB ('rgb(0, 0, 255)')
    // * HSL ('hsl(60, 100%, 50%)')
    if (population < 2000000) {
      fillColor = "green";
    } else if (population < 5000000) {
      fillColor = "red";
    } else if (population < 10000000) {
      fillColor = "blue";
    } else if (population < 40000000) {
      fillColor = "yellow";
    }
    return {
      fillColor,
      fillOpacity: 0.5,
    };
  };

  // Population data by state.
  const states = {
    "ChIJdf5LHzR_hogR6czIUzU0VV4": 5039877, // Alabama
    "ChIJG8CuwJzfAFQRNduKqSde27w": 732673, // Alaska
    "ChIJaxhMy-sIK4cRcc3Bf7EnOUI": 7276316, // Arizona
    "ChIJYSc_dD-e0ocR0NLf_z5pBaQ": 3025891, // Arkansas
    "ChIJPV4oX_65j4ARVW8IJ6IJUYs": 39237836, // California
    "ChIJt1YYm3QUQIcR_6eQSTGDVMc": 5812069, // Colorado
    "ChIJpVER8hFT5okR5XBhBVttmq4": 3605597, // Connecticut
    "ChIJO9YMTXYFx4kReOgEjBItHZQ": 1003384, // Delaware
    "ChIJvypWkWV2wYgR0E7HW9MTLvc": 21781128, // Florida
    "ChIJV4FfHcU28YgR5xBP7BC8hGY": 10799566, // Georgia
    "ChIJBeB5Twbb_3sRKIbMdNKCd0s": 1441553, // Hawaii
    "ChIJ6Znkhaj_WFMRWIf3FQUwa9A": 1900923, // Idaho
    "ChIJGSZubzgtC4gRVlkRZFCCFX8": 12671469, // Illinois
    "ChIJHRv42bxQa4gRcuwyy84vEH4": 6805985, // Indiana
    "ChIJGWD48W9e7ocR2VnHV0pj78Y": 3193079, // Iowa
    "ChIJawF8cXEXo4cRXwk-S6m0wmg": 2934582, // Kansas
    "ChIJyVMZi0xzQogR_N_MxU5vH3c": 4509394, // Kentucky
    "ChIJZYIRslSkIIYRA0flgTL3Vck": 4624047, // Louisiana
    "ChIJ1YpTHd4dsEwR0KggZ2_MedY": 1372247, // Maine
    "ChIJ35Dx6etNtokRsfZVdmU3r_I": 6165129, // Maryland
    "ChIJ_b9z6W1l44kRHA2DVTbQxkU": 6984723, // Massachussetts
    "ChIJEQTKxz2qTE0Rs8liellI3Zc": 10050811, // Michigan
    "ChIJmwt4YJpbWE0RD6L-EJvJogI": 5707390, // Minnesota
    "ChIJGdRK5OQyKIYR2qbc6X8XDWI": 2949965, // Mississippi
    "ChIJfeMiSNXmwIcRcr1mBFnEW7U": 6168187, // Misssouri
    "ChIJ04p7LZwrQVMRGGwqz1jWcfU": 1104271, // Montana
    "ChIJ7fwMtciNk4cRxArzDwyQJ6E": 1963692, // Nebraska
    "ChIJcbTe-KEKmYARs5X8qooDR88": 3143991, // Nevada
    "ChIJ66bAnUtEs0wR64CmJa8CyNc": 1388992, // New Hampshire
    "ChIJn0AAnpX7wIkRjW0_-Ad70iw": 9267130, // New Jersey
    "ChIJqVKY50NQGIcRup41Yxpuv0Y": 2115877, // New Mexico
    "ChIJqaUj8fBLzEwRZ5UY3sHGz90": 19835913, // New York
    "ChIJgRo4_MQfVIgRGa4i6fUwP60": 10551162, // North Carolina
    "ChIJY-nYVxKD11IRyc9egzmahA0": 774948, // North Dakota
    "ChIJwY5NtXrpNogRFtmfnDlkzeU": 11780017, // Ohio
    "ChIJnU-ssRE5rIcRSOoKQDPPHF0": 3986639, // Oklahoma
    "ChIJVWqfm3xuk1QRdrgLettlTH0": 4246155, // Oregon
    "ChIJieUyHiaALYgRPbQiUEchRsI": 12964056, // Pennsylvania
    "ChIJD9cOYhQ15IkR5wbB57wYTh4": 1095610, // Rhode Island
    "ChIJ49ExeWml-IgRnhcF9TKh_7k": 5190705, // South Carolina
    "ChIJpTjphS1DfYcRt6SGMSnW8Ac": 895376, // South Dakota
    "ChIJA8-XniNLYYgRVpGBpcEgPgM": 6975218, // Tennessee
    "ChIJSTKCCzZwQIYRPN4IGI8c6xY": 29527941, // Texas
    "ChIJzfkTj8drTIcRP0bXbKVK370": 3337975, // Utah
    "ChIJ_87aSGzctEwRtGtUNnSJTSY": 645570, // Vermont
    "ChIJzbK8vXDWTIgRlaZGt0lBTsA": 8642274, // Virginia
    "ChIJ-bDD5__lhVQRuvNfbGh4QpQ": 7738692, // Washington
    "ChIJRQnL1KVUSogRQzrN3mjHALs": 1782959, // West Virginia
    "ChIJr-OEkw_0qFIR1kmG-LjV1fI": 5895908, // Wisconsin
    "ChIJaS7hSDTiXocRLzh90nkisCY": 578803, // Wyoming
  };
}

initMap();

CSS

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

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

HTML

<html>
  <head>
    <title>Choropleth Map</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="map"></div>

    <!-- prettier-ignore -->
    <script>(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))})
        ({key: "AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg", v: "weekly"});</script>
  </body>
</html>

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