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
根据Daniel Vassallo的回答，下面是一个以更简单的方式处理闭包问题的版本。
因为所有的标记都有一个单独的InfoWindow，而且JavaScript并不关心你是否给对象添加了额外的属性，你所需要做的就是给标记的属性添加一个InfoWindow，然后调用InfoWindow本身的.open() !
编辑:有了足够的数据，页面加载可能会花费很多时间，因此与其使用标记构造InfoWindow，不如只在需要时进行构造。注意，用于构造InfoWindow的任何数据都必须作为属性(data)追加到Marker。还要注意，在第一次单击事件之后，infoWindow将作为它的标记的属性持久化，因此浏览器不需要不断地重构。
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'), {
center: new google.maps.LatLng(-33.92, 151.25)
});
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,
data: {
name: locations[i][0]
}
});
marker.addListener('click', function() {
if(!this.infoWindow) {
this.infoWindow = new google.maps.InfoWindow({
content: this.data.name;
});
}
this.infoWindow.open(map,this);
})
}
其他回答
var arr = new Array();
function initialize() {
var i;
var Locations = [
{
lat:48.856614,
lon:2.3522219000000177,
address:'Paris',
gval:'25.5',
aType:'Non-Commodity',
title:'Paris',
descr:'Paris'
},
{
lat: 55.7512419,
lon: 37.6184217,
address:'Moscow',
gval:'11.5',
aType:'Non-Commodity',
title:'Moscow',
descr:'Moscow Airport'
},
{
lat:-9.481553000000002,
lon:147.190242,
address:'Port Moresby',
gval:'1',
aType:'Oil',
title:'Papua New Guinea',
descr:'Papua New Guinea 123123123'
},
{
lat:20.5200,
lon:77.7500,
address:'Indore',
gval:'1',
aType:'Oil',
title:'Indore, India',
descr:'Airport India'
}
];
var myOptions = {
zoom: 2,
center: new google.maps.LatLng(51.9000,8.4731),
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("map"), myOptions);
var infowindow = new google.maps.InfoWindow({
content: ''
});
for (i = 0; i < Locations.length; i++) {
size=15;
var img=new google.maps.MarkerImage('marker.png',
new google.maps.Size(size, size),
new google.maps.Point(0,0),
new google.maps.Point(size/2, size/2)
);
var marker = new google.maps.Marker({
map: map,
title: Locations[i].title,
position: new google.maps.LatLng(Locations[i].lat, Locations[i].lon),
icon: img
});
bindInfoWindow(marker, map, infowindow, "<p>" + Locations[i].descr + "</p>",Locations[i].title);
}
}
function bindInfoWindow(marker, map, infowindow, html, Ltitle) {
google.maps.event.addListener(marker, 'mouseover', function() {
infowindow.setContent(html);
infowindow.open(map, marker);
});
google.maps.event.addListener(marker, 'mouseout', function() {
infowindow.close();
});
}
完整的工作示例。你可以复制，粘贴和使用。
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>
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,
};
下面是一个几乎完整的示例javascript函数，它允许在JSONObject中定义多个标记。
它将只显示在地图边界内的标记。
这很重要，这样你就不用做额外的工作了。
你也可以设置一个标记的限制，这样你就不会显示一个极端数量的标记(如果有可能在你的使用);
如果地图中心的变化不超过500米，就不会显示标记。 这很重要，因为如果用户单击标记并在此过程中意外地拖动了地图，您不希望地图重新加载标记。
我将这个函数附加到地图的空闲事件侦听器，因此标记只在地图空闲时显示，并在不同的事件后重新显示标记。
活动屏幕截图 在信息窗口中显示更多内容的屏幕截图有一个小变化。 粘贴自pastbin.com
<script src=“//pastebin.com/embed_js/uWAbRxfg”></script>
在程序中添加标记非常简单。你只需要添加以下代码:
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
当你构造一个标记时，下面的字段是特别重要和经常设置的:
position(必选)指定标识标记初始位置的LatLng。检索LatLng的一种方法是使用地理编码服务。 map(可选)指定放置标记的map。如果在构建标记时没有指定映射，则会创建标记，但不会附加到(或显示在)映射上。稍后可以通过调用标记的setMap()方法添加标记。
注意，在本例中，标题字段设置了将作为工具提示显示的标记标题。
您可以在这里查阅谷歌api文档。
这是在地图中设置一个标记的完整示例。注意，你必须用你的谷歌API密钥替换YOUR_API_KEY:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Simple markers</title>
<style>
/* 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;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
function initMap() {
var myLatLng = {lat: -25.363, lng: 131.044};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 4,
center: myLatLng
});
var marker = new google.maps.Marker({
position: myLatLng,
map: map,
title: 'Hello World!'
});
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
现在，如果你想在map中绘制数组的标记，你应该这样做:
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]
];
function initMap() {
var myLatLng = {lat: -33.90, lng: 151.16};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: myLatLng
});
var count;
for (count = 0; count < locations.length; count++) {
new google.maps.Marker({
position: new google.maps.LatLng(locations[count][1], locations[count][2]),
map: map,
title: locations[count][0]
});
}
}
这个例子给出了如下结果:
你也可以在你的pin中添加一个infoWindow。你只需要这段代码:
var marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[count][1], locations[count][2]),
map: map
});
marker.info = new google.maps.InfoWindow({
content: 'Hello World!'
});
你可以在这里找到谷歌关于infoWindows的文档。
现在，我们可以在标记像这样“点击”时打开infoWindow:
var marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[count][1], locations[count][2]),
map: map
});
marker.info = new google.maps.InfoWindow({
content: locations [count][0]
});
google.maps.event.addListener(marker, 'click', function() {
// this = marker
var marker_map = this.getMap();
this.info.open(marker_map, this);
// Note: If you call open() without passing a marker, the InfoWindow will use the position specified upon construction through the InfoWindowOptions object literal.
});
注意，您可以在谷歌developer中获得一些关于Listener的文档。
最后，如果用户点击它，我们可以在标记中绘制一个infoWindow。这是我的完整代码:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no">
<meta charset="utf-8">
<title>Info windows</title>
<style>
/* 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;
}
</style>
</head>
<body>
<div id="map"></div>
<script>
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]
];
// When the user clicks the marker, an info window opens.
function initMap() {
var myLatLng = {lat: -33.90, lng: 151.16};
var map = new google.maps.Map(document.getElementById('map'), {
zoom: 10,
center: myLatLng
});
var count=0;
for (count = 0; count < locations.length; count++) {
var marker = new google.maps.Marker({
position: new google.maps.LatLng(locations[count][1], locations[count][2]),
map: map
});
marker.info = new google.maps.InfoWindow({
content: locations [count][0]
});
google.maps.event.addListener(marker, 'click', function() {
// this = marker
var marker_map = this.getMap();
this.info.open(marker_map, this);
// Note: If you call open() without passing a marker, the InfoWindow will use the position specified upon construction through the InfoWindowOptions object literal.
});
}
}
</script>
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
</script>
</body>
</html>
通常，你会得到这样的结果:
