响应 Local Context 事件

如果您的布局应在显示地点详情视图时更改，请使用事件监听器 placedetailsviewshowstart 和 placedetailsviewhidestart。在下面的示例中，有三个由自定义标记表示的地区。当用户点击其中一个地区标记时，系统会打开一个描述该地区的 InfoWindow。如果用户在 InfoWindow 处于打开状态时点击某个地图注点，InfoWindow 将在地图注点的地点详情视图显示时关闭，并在用户关闭地点详情视图时重新打开。

查看源代码

TypeScript

let map: google.maps.Map;

let infoWindow;
let infoStorage;

const districts = {
  a: {
    label: "1",
    location: {
      lat: -1.283975,
      lng: 36.818797,
    },
    name: "Central",
    description:
      "The Central Business District is a hub of economic activity during the day and a destination for great food at night.",
  },
  b: {
    label: "2",
    location: {
      lat: -1.270955,
      lng: 36.810857,
    },
    name: "Westlands",
    description:
      "With many high-end restaurants and a vibrant nightlife, Westlands attracts young professionals and their families. ",
  },
  c: {
    label: "3",
    location: {
      lat: -1.311868,
      lng: 36.838624,
    },
    name: "South",
    description:
      "Known for high-rise apartment buildings, South B and South C are in high demand.",
  },
};

function initMap() {
  const localContextMapView = new google.maps.localContext.LocalContextMapView({
    element: document.getElementById("map"),
    placeTypePreferences: [
      { type: "restaurant" },
      { type: "tourist_attraction" },
    ],
    maxPlaceCount: 12,
  });

  map = localContextMapView.map!;

  map.setOptions({
    center: districts["a"].location,
    zoom: 13,
  });

  // Add 3 custom markers that open InfoWindows on click
  for (const key in districts) {
    const district = districts[key];
    const marker = new google.maps.Marker({
      label: district.label,
      position: district.location,
      map: map,
      zIndex: 30,
    });

    marker.addListener("click", () => {
      // Close any open details or existing InfoWindows
      localContextMapView.hidePlaceDetailsView();

      if (infoWindow) {
        infoWindow.close();
      }

      // Create and open a new InfoWindow
      createInfoWindow(district, marker);

      // Define origin as the selected marker position
      localContextMapView.directionsOptions = {
        origin: district.location,
      };
    });
  }

  // Set the LocalContextMapView event handlers.
  localContextMapView.addListener("placedetailsviewshowstart", () => {
    if (infoWindow) {
      infoWindow.close();
    }
  });

  localContextMapView.addListener("placedetailsviewhidestart", () => {
    if (infoStorage) {
      createInfoWindow(infoStorage.district, infoStorage.marker);
    }
  });
}

// Creates an infoWindow and also stores information associated with the
// InfoWindow so the InfoWindow can be restored after it has been closed
// by non-user-initiated events.
function createInfoWindow(district, marker) {
  // Build the content of the InfoWindow
  const contentDiv = document.createElement("div");
  const nameDiv = document.createElement("div");
  const descriptionDiv = document.createTextNode(district.description);

  contentDiv.classList.add("infowindow-content");
  nameDiv.classList.add("title");
  nameDiv.textContent = district.name;
  descriptionDiv.textContent = district.description;
  contentDiv.appendChild(nameDiv);
  contentDiv.appendChild(descriptionDiv);

  // Create and open a new InfoWindow
  infoWindow = new google.maps.InfoWindow();
  infoWindow.setContent(contentDiv);
  infoWindow.open(map, marker);

  // Store key properties of the InfoWindow for future restoration
  infoStorage = {
    district: district,
    marker: marker,
  };

  // Clear content storage if infoWindow is closed by the user
  infoWindow.addListener("closeclick", () => {
    if (infoStorage) {
      infoStorage = null;
    }
  });
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;index.ts

JavaScript

let map;
let infoWindow;
let infoStorage;
const districts = {
  a: {
    label: "1",
    location: {
      lat: -1.283975,
      lng: 36.818797,
    },
    name: "Central",
    description:
      "The Central Business District is a hub of economic activity during the day and a destination for great food at night.",
  },
  b: {
    label: "2",
    location: {
      lat: -1.270955,
      lng: 36.810857,
    },
    name: "Westlands",
    description:
      "With many high-end restaurants and a vibrant nightlife, Westlands attracts young professionals and their families. ",
  },
  c: {
    label: "3",
    location: {
      lat: -1.311868,
      lng: 36.838624,
    },
    name: "South",
    description:
      "Known for high-rise apartment buildings, South B and South C are in high demand.",
  },
};

function initMap() {
  const localContextMapView = new google.maps.localContext.LocalContextMapView({
    element: document.getElementById("map"),
    placeTypePreferences: [
      { type: "restaurant" },
      { type: "tourist_attraction" },
    ],
    maxPlaceCount: 12,
  });

  map = localContextMapView.map;
  map.setOptions({
    center: districts["a"].location,
    zoom: 13,
  });

  // Add 3 custom markers that open InfoWindows on click
  for (const key in districts) {
    const district = districts[key];
    const marker = new google.maps.Marker({
      label: district.label,
      position: district.location,
      map: map,
      zIndex: 30,
    });

    marker.addListener("click", () => {
      // Close any open details or existing InfoWindows
      localContextMapView.hidePlaceDetailsView();
      if (infoWindow) {
        infoWindow.close();
      }

      // Create and open a new InfoWindow
      createInfoWindow(district, marker);
      // Define origin as the selected marker position
      localContextMapView.directionsOptions = {
        origin: district.location,
      };
    });
  }

  // Set the LocalContextMapView event handlers.
  localContextMapView.addListener("placedetailsviewshowstart", () => {
    if (infoWindow) {
      infoWindow.close();
    }
  });
  localContextMapView.addListener("placedetailsviewhidestart", () => {
    if (infoStorage) {
      createInfoWindow(infoStorage.district, infoStorage.marker);
    }
  });
}

// Creates an infoWindow and also stores information associated with the
// InfoWindow so the InfoWindow can be restored after it has been closed
// by non-user-initiated events.
function createInfoWindow(district, marker) {
  // Build the content of the InfoWindow
  const contentDiv = document.createElement("div");
  const nameDiv = document.createElement("div");
  const descriptionDiv = document.createTextNode(district.description);

  contentDiv.classList.add("infowindow-content");
  nameDiv.classList.add("title");
  nameDiv.textContent = district.name;
  descriptionDiv.textContent = district.description;
  contentDiv.appendChild(nameDiv);
  contentDiv.appendChild(descriptionDiv);
  // Create and open a new InfoWindow
  infoWindow = new google.maps.InfoWindow();
  infoWindow.setContent(contentDiv);
  infoWindow.open(map, marker);
  // Store key properties of the InfoWindow for future restoration
  infoStorage = {
    district: district,
    marker: marker,
  };
  // Clear content storage if infoWindow is closed by the user
  infoWindow.addListener("closeclick", () => {
    if (infoStorage) {
      infoStorage = null;
    }
  });
}

window.initMap = initMap;index.js

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;
}

.infowindow-content {
  width: 300px;
}

.title {
  font-size: x-large;
  font-weight: bold;
}
style.css

HTML

<html>
  <head>
    <title>Local Context Events</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>

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

    <!--
      The `defer` attribute causes the callback to execute after the full HTML
      document has been parsed. For non-blocking uses, avoiding race conditions,
      and consistent behavior across browsers, consider loading using Promises
      with https://www.npmjs.com/package/@googlemaps/js-api-loader.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=localContext&v=beta"
      defer
    ></script>
  </body>
</html>index.html

试用示例

Stackblitz.com CodeSandbox.io JSFiddle.net GitPod.io Google Cloud Shell

了解代码

管理包含地点详情视图事件的 `InfoWindow`

如果您在地点详情视图处于打开状态时调用 InfoWindow.close()，打开的 InfoWindow 会从 DOM 中移除。为了创建“重新打开”InfoWindow 的效果，您必须将 InfoWindow 的属性存储在 DOM 之外的变量中，以便在希望 InfoWindow 再次显示时重新创建它。建议在创建 InfoWindow 时将信息保存到某个存储空间变量。

let infoStorage;

function createInfoWindow(district, marker) {
  // Build the content of the InfoWindow
  let contentDiv = document.createElement('div');
  ...

  // Create and open a new InfoWindow
  infoWindow = new google.maps.InfoWindow();
  infoWindow.setContent(contentDiv);
  infoWindow.open(map, marker);

  // Store key properties of the InfoWindow for future restoration
  infoStorage = {
    'district': district,
    'marker': marker,
  };
}

稍后，当地点详情视图关闭时，您可以调用同一 InfoWindow 创建函数来重新创建最后打开的 InfoWindow。

TypeScript

localContextMapView.addListener("placedetailsviewhidestart", () => {
  if (infoStorage) {
    createInfoWindow(infoStorage.district, infoStorage.marker);
  }
});index.ts

JavaScript

localContextMapView.addListener("placedetailsviewhidestart", () => {
  if (infoStorage) {
    createInfoWindow(infoStorage.district, infoStorage.marker);
  }
});index.js

更新路线出发地

由于此地图上有多个地区标记可供用户选择，因此我们会在标记的点击监听器中使用下面这几行代码将 directionsOptions 的出发地更新为最终点击的地区。这表明即使在初始化 localContextMapView 之后，也可以更新 directionsOptions。

试用示例

Stackblitz.com CodeSandbox.io JSFiddle.net GitPod.io Google Cloud Shell

响应 Local Context 事件

查看源代码

TypeScript

JavaScript

CSS

HTML

试用示例

了解代码

管理包含地点详情视图事件的 InfoWindow

TypeScript

JavaScript

更新路线出发地

试用示例

管理包含地点详情视图事件的 `InfoWindow`