谷歌Maps Api相当新。我有一个数据数组，我想循环遍历并在地图上绘制。看似相当简单，但我发现的所有多标记教程都相当复杂。
让我们以谷歌网站的数据数组为例:
var locations = [
['Bondi Beach', -33.890542, 151.274856, 4],
['Coogee Beach', -33.923036, 151.259052, 5],
['Cronulla Beach', -34.028249, 151.157507, 3],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
['Maroubra Beach', -33.950198, 151.259302, 1]
];
我只是想绘制所有这些点，并在单击时弹出一个infoWindow来显示名称。
当前回答
下面是另一个使用唯一标题和infoWindow文本加载多个标记的示例。使用最新的谷歌映射API V3.11进行测试。
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1" />
<title>Multiple Markers Google Maps</title>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
<script
src="https://maps.googleapis.com/maps/api/js?v=3.11&sensor=false"
type="text/javascript"
></script>
<script type="text/javascript">
// check DOM Ready
$(document).ready(function () {
// execute
(function () {
// map options
var options = {
zoom: 5,
center: new google.maps.LatLng(39.909736, -98.522109), // centered US
mapTypeId: google.maps.MapTypeId.TERRAIN,
mapTypeControl: false,
};
// init map
var map = new google.maps.Map(
document.getElementById('map_canvas'),
options
);
// NY and CA sample Lat / Lng
var southWest = new google.maps.LatLng(40.744656, -74.005966);
var northEast = new google.maps.LatLng(34.052234, -118.243685);
var lngSpan = northEast.lng() - southWest.lng();
var latSpan = northEast.lat() - southWest.lat();
// set multiple marker
for (var i = 0; i < 250; i++) {
// init markers
var marker = new google.maps.Marker({
position: new google.maps.LatLng(
southWest.lat() + latSpan * Math.random(),
southWest.lng() + lngSpan * Math.random()
),
map: map,
title: 'Click Me ' + i,
});
// process multiple info windows
(function (marker, i) {
// add click event
google.maps.event.addListener(marker, 'click', function () {
infowindow = new google.maps.InfoWindow({
content: 'Hello, World!!',
});
infowindow.open(map, marker);
});
})(marker, i);
}
})();
});
</script>
</head>
<body>
<div id="map_canvas" style="width: 800px; height: 500px"></div>
</body>
</html>
250个标记的截图:
它将自动随机化Lat/Lng，使其独一无二。如果你想测试500、1000、xxx标记和性能，这个例子将非常有用。
其他回答
异步版本:
<script type="text/javascript">
function initialize() {
var locations = [
['Bondi Beach', -33.890542, 151.274856, 4],
['Coogee Beach', -33.923036, 151.259052, 5],
['Cronulla Beach', -34.028249, 151.157507, 3],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
['Maroubra Beach', -33.950198, 151.259302, 1]
];
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: new google.maps.LatLng(-33.92, 151.25),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var infowindow = new google.maps.InfoWindow();
var marker, i;
for (i = 0; i < locations.length; i++) {
marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[i][1], locations[i][2]),
map: map
});
google.maps.event.addListener(marker, 'click', (function(marker, i) {
return function() {
infowindow.setContent(locations[i][0]);
infowindow.open(map, marker);
}
})(marker, i));
}
}
function loadScript() {
var script = document.createElement('script');
script.type = 'text/javascript';
script.src = 'https://maps.googleapis.com/maps/api/js?v=3.exp&' +
'callback=initialize';
document.body.appendChild(script);
}
window.onload = loadScript;
</script>
下面是一个Reactjs中多个标记的例子。
下面是映射组件
import React from 'react';
import PropTypes from 'prop-types';
import { Map, InfoWindow, Marker, GoogleApiWrapper } from 'google-maps-react';
const MapContainer = (props) => {
const [mapConfigurations, setMapConfigurations] = useState({
showingInfoWindow: false,
activeMarker: {},
selectedPlace: {}
});
var points = [
{ lat: 42.02, lng: -77.01 },
{ lat: 42.03, lng: -77.02 },
{ lat: 41.03, lng: -77.04 },
{ lat: 42.05, lng: -77.02 }
]
const onMarkerClick = (newProps, marker) => {};
if (!props.google) {
return <div>Loading...</div>;
}
return (
<div className="custom-map-container">
<Map
style={{
minWidth: '200px',
minHeight: '140px',
width: '100%',
height: '100%',
position: 'relative'
}}
initialCenter={{
lat: 42.39,
lng: -72.52
}}
google={props.google}
zoom={16}
>
{points.map(coordinates => (
<Marker
position={{ lat: coordinates.lat, lng: coordinates.lng }}
onClick={onMarkerClick}
icon={{
url: 'https://res.cloudinary.com/mybukka/image/upload/c_scale,r_50,w_30,h_30/v1580550858/yaiwq492u1lwuy2lb9ua.png',
anchor: new google.maps.Point(32, 32), // eslint-disable-line
scaledSize: new google.maps.Size(30, 30) // eslint-disable-line
}}
name={name}
/>))}
<InfoWindow
marker={mapConfigurations.activeMarker}
visible={mapConfigurations.showingInfoWindow}
>
<div>
<h1>{mapConfigurations.selectedPlace.name}</h1>
</div>
</InfoWindow>
</Map>
</div>
);
};
export default GoogleApiWrapper({
apiKey: process.env.GOOGLE_API_KEY,
v: '3'
})(MapContainer);
MapContainer.propTypes = {
google: PropTypes.shape({}).isRequired,
};
来源链接
演示链接
完整的HTML代码
在单击或悬停时显示InfoWindow。 只会显示一个InfoWindow
<!DOCTYPE html>
<html>
<head>
<style>
/* <span class="metadata-marker" style="display: none;" data-region_tag="css"></span> Set the size of the div element that contains the map */
#map {
height: 400px;
/* The height is 400 pixels */
width: 100%;
/* The width is the width of the web page */
}
</style>
<script>
var map;
var InforObj = [];
var centerCords = {
lat: -25.344,
lng: 131.036
};
var markersOnMap = [{
placeName: "Australia (Uluru)",
LatLng: [{
lat: -25.344,
lng: 131.036
}]
},
{
placeName: "Australia (Melbourne)",
LatLng: [{
lat: -37.852086,
lng: 504.985963
}]
},
{
placeName: "Australia (Canberra)",
LatLng: [{
lat: -35.299085,
lng: 509.109615
}]
},
{
placeName: "Australia (Gold Coast)",
LatLng: [{
lat: -28.013044,
lng: 513.425586
}]
},
{
placeName: "Australia (Perth)",
LatLng: [{
lat: -31.951994,
lng: 475.858081
}]
}
];
window.onload = function () {
initMap();
};
function addMarkerInfo() {
for (var i = 0; i < markersOnMap.length; i++) {
var contentString = '<div id="content"><h1>' + markersOnMap[i].placeName +
'</h1><p>Lorem ipsum dolor sit amet, vix mutat posse suscipit id, vel ea tantas omittam detraxit.</p></div>';
const marker = new google.maps.Marker({
position: markersOnMap[i].LatLng[0],
map: map
});
const infowindow = new google.maps.InfoWindow({
content: contentString,
maxWidth: 200
});
marker.addListener('click', function () {
closeOtherInfo();
infowindow.open(marker.get('map'), marker);
InforObj[0] = infowindow;
});
// marker.addListener('mouseover', function () {
// closeOtherInfo();
// infowindow.open(marker.get('map'), marker);
// InforObj[0] = infowindow;
// });
// marker.addListener('mouseout', function () {
// closeOtherInfo();
// infowindow.close();
// InforObj[0] = infowindow;
// });
}
}
function closeOtherInfo() {
if (InforObj.length > 0) {
/* detach the info-window from the marker ... undocumented in the API docs */
InforObj[0].set("marker", null);
/* and close it */
InforObj[0].close();
/* blank the array */
InforObj.length = 0;
}
}
function initMap() {
map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: centerCords
});
addMarkerInfo();
}
</script>
</head>
<body>
<h3>My Google Maps Demo</h3>
<!--The div element for the map -->
<div id="map"></div>
<script src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY"></script>
</body>
</html>
来自谷歌Map API示例:
function initialize() {
var myOptions = {
zoom: 10,
center: new google.maps.LatLng(-33.9, 151.2),
mapTypeId: google.maps.MapTypeId.ROADMAP
}
var map = new google.maps.Map(document.getElementById("map_canvas"),
myOptions);
setMarkers(map, beaches);
}
/**
* Data for the markers consisting of a name, a LatLng and a zIndex for
* the order in which these markers should display on top of each
* other.
*/
var beaches = [
['Bondi Beach', -33.890542, 151.274856, 4],
['Coogee Beach', -33.923036, 151.259052, 5],
['Cronulla Beach', -34.028249, 151.157507, 3],
['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
['Maroubra Beach', -33.950198, 151.259302, 1]
];
function setMarkers(map, locations) {
// Add markers to the map
// Marker sizes are expressed as a Size of X,Y
// where the origin of the image (0,0) is located
// in the top left of the image.
// Origins, anchor positions and coordinates of the marker
// increase in the X direction to the right and in
// the Y direction down.
var image = new google.maps.MarkerImage('images/beachflag.png',
// This marker is 20 pixels wide by 32 pixels tall.
new google.maps.Size(20, 32),
// The origin for this image is 0,0.
new google.maps.Point(0,0),
// The anchor for this image is the base of the flagpole at 0,32.
new google.maps.Point(0, 32));
var shadow = new google.maps.MarkerImage('images/beachflag_shadow.png',
// The shadow image is larger in the horizontal dimension
// while the position and offset are the same as for the main image.
new google.maps.Size(37, 32),
new google.maps.Point(0,0),
new google.maps.Point(0, 32));
// Shapes define the clickable region of the icon.
// The type defines an HTML <area> element 'poly' which
// traces out a polygon as a series of X,Y points. The final
// coordinate closes the poly by connecting to the first
// coordinate.
var shape = {
coord: [1, 1, 1, 20, 18, 20, 18 , 1],
type: 'poly'
};
for (var i = 0; i < locations.length; i++) {
var beach = locations[i];
var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
shadow: shadow,
icon: image,
shape: shape,
title: beach[0],
zIndex: beach[3]
});
}
}
我想我将把这个放在这里，因为它似乎是那些开始使用谷歌地图API的一个流行的着陆点。在客户端呈现多个标记可能是许多映射应用程序性能下降的原因。很难进行基准测试、修复，在某些情况下甚至很难确定存在问题(由于浏览器实现的差异、客户端可用的硬件、移动设备等等)。
开始解决这个问题的最简单方法是使用标记集群解决方案。其基本思想是将地理上相似的位置分组，并显示点的数量。当用户放大地图时，这些组会展开，显示出下面的单个标记。
也许最简单的实现是markerclusterer库。基本实现如下(在库导入之后):
<script type="text/javascript">
function initialize() {
var center = new google.maps.LatLng(37.4419, -122.1419);
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 3,
center: center,
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var markers = [];
for (var i = 0; i < 100; i++) {
var location = yourData.location[i];
var latLng = new google.maps.LatLng(location.latitude,
location.longitude);
var marker = new google.maps.Marker({
position: latLng
});
markers.push(marker);
}
var markerCluster = new MarkerClusterer({map, markers});
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
标记不是直接添加到映射中，而是添加到数组中。然后将该数组传递给为您处理复杂计算的库，并将其附加到映射。
这些实现不仅极大地提高了客户端性能，而且在许多情况下，它们还会导致更简单、更整洁的UI，更容易在更大范围内消化数据。
谷歌提供了其他实现。
希望这能帮助到那些刚接触映射的人。
