Kiểu bản đồ mới sắp xuất hiện trên Nền tảng Google Maps. Bản cập nhật này để tạo kiểu bản đồ bao gồm một bảng màu mặc định mới và các cải tiến về trải nghiệm bản đồ cũng như khả năng hữu dụng. Tất cả kiểu bản đồ sẽ được cập nhật tự động vào tháng 3 năm 2025. Để biết thêm thông tin về phạm vi cung cấp và cách chọn tham gia sớm hơn, hãy xem bài viết Kiểu bản đồ mới cho Nền tảng Google Maps.
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;
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;
/*
* 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;
}
<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.
See https://developers.google.com/maps/documentation/javascript/load-maps-js-api
for more information.
-->
<script
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&libraries=localContext&v=beta"
defer
></script>
</body>
</html>
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,
};
}