javascript - 当标记超出指定区域时收到警报（Google Maps API）
问题描述
我是谷歌地图的新手，当标记移出圆圈时我需要收到警报，我已经创建了地图并添加了一些圆圈来表示标记可以停留的区域，在它们之外我需要显示一个警告宣布这不是覆盖区域。
我的代码如下：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Documento sin título</title>
<script src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCA3CvqkU5D5dLfADaABJi3OxjoWL64keA&callback=initMap&libraries=places&v=weekly" defer></script>
<script type="text/javascript">
const citymap = {
escalon: {
center: { lat: 13.701984532461921, lng: -89.23395010808454 },
},
};
const citymap1 = {
matriz: {
center: { lat: 13.699526, lng: -89.196691 },
},
};
const citymap2 = {
plaza: {
center: { lat: 13.699581, lng: -89.189770 },
},
};
const citymap3 = {
ahuachapan: {
center: { lat: 13.920266, lng: -89.847658 },
},
};
const citymap4 = {
sanMiguel: {
center: { lat: 13.484937, lng: -88.177339 },
},
};
const citymap5 = {
santaAna: {
center: { lat: 13.993704, lng: -89.556913 },
},
};
const citymap6 = {
sonsonate: {
center: { lat: 13.720177, lng: -89.727801 },
},
};
function initialize() {
// Creating map object
var map = new google.maps.Map(document.getElementById('map_canvas'), {
zoom: 12,
center: new google.maps.LatLng(13.701277, -89.224468),
mapTypeId: google.maps.MapTypeId.ROADMAP
});
var vMarker = new google.maps.Marker({
position: new google.maps.LatLng(13.701277, -89.224468),
draggable: true
});
google.maps.event.addListener(vMarker, 'dragend', function (evt) {
$("#txtLat").val("https://www.google.es/maps/dir/" + evt.latLng.lat().toFixed(6) + ", " + evt.latLng.lng().toFixed(6));
map.panTo(evt.latLng);
});
for (const city in citymap) {
// Add the circle for this city to the map.
const vMarker = new google.maps.Marker({
position: new google.maps.LatLng(13.701277, -89.224468),
draggable: true
});
}
for (const city in citymap) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap[city].center,
radius: 8000,
});
}
for (const city in citymap1) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap1[city].center,
radius: 5000,
});
}
for (const city in citymap2) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap2[city].center,
radius: 5000,
});
}
for (const city in citymap3) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap3[city].center,
radius: 7000,
});
}
for (const city in citymap4) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap4[city].center,
radius: 7000,
});
}
for (const city in citymap5) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap5[city].center,
radius: 7000,
});
}
for (const city in citymap6) {
// Add the circle for this city to the map.
const cityCircle = new google.maps.Circle({
strokeColor: "#0066cc",
strokeOpacity: 0.8,
strokeWeight: 2,
fillColor: "#0066cc",
fillOpacity: 0.35,
map,
center: citymap6[city].center,
radius: 7000,
});
}
// centers the map on markers coords
map.setCenter(vMarker.position);
// adds the marker on the map
vMarker.setMap(map);
}
</script>
</head>
<body onload="initialize();">
<div id='map_canvas' style='width: auto; height: 500px;'></div>
</body>
</html>
我给你留下了这个示例代码，以便更广泛地了解我的问题，因为我正在尝试做的是一种送货上门服务，地图上标记为蓝色的区域是如果有覆盖的区域我的送货上门，但如果标记位于它们之外，或者如果客户将它们移到它们之外，我需要显示警报以警告它不可能，我感谢所有的支持，问候。
解决方案
您可以通过获取getBounds()圆圈的边界并检查标记的位置是否在这些边界内来做到这一点，如下所示：
function init() {
var
contentCenter = '<span class="infowin">Center Marker (draggable)</span>',
contentA = '<span class="infowin">Marker A (draggable)</span>',
contentB = '<span class="infowin">Marker B (draggable)</span>';
var
latLngCenter = new google.maps.LatLng(37.081476, -94.510574),
latLngCMarker = new google.maps.LatLng(37.0814, -94.5105),
latLngA = new google.maps.LatLng(37.2, -94.1),
latLngB = new google.maps.LatLng(38, -93),
map = new google.maps.Map(document.getElementById('map'), {
zoom: 7,
center: latLngCenter,
mapTypeId: google.maps.MapTypeId.ROADMAP,
mapTypeControl: false
}),
markerCenter = new google.maps.Marker({
position: latLngCMarker,
title: 'Location',
map: map,
draggable: true
}),
infoCenter = new google.maps.InfoWindow({
content: contentCenter
}),
markerA = new google.maps.Marker({
position: latLngA,
title: 'Location',
map: map,
draggable: true
}),
infoA = new google.maps.InfoWindow({
content: contentA
}),
markerB = new google.maps.Marker({
position: latLngB,
title: 'Location',
map: map,
draggable: true
}),
infoB = new google.maps.InfoWindow({
content: contentB
})
// exemplary setup:
// Assumes that your map is signed to the var "map"
// Also assumes that your marker is named "marker"
,
circle = new google.maps.Circle({
map: map,
clickable: false,
// metres
radius: 100000,
fillColor: '#fff',
fillOpacity: .6,
strokeColor: '#313131',
strokeOpacity: .4,
strokeWeight: .8
});
// attach circle to marker
circle.bindTo('center', markerCenter, 'position');
var
// get the Bounds of the circle
bounds = circle.getBounds()
// Note spans
,
noteA = jQuery('.bool#a'),
noteB = jQuery('.bool#b');
noteA.text(bounds.contains(latLngA));
noteB.text(bounds.contains(latLngB));
// get some latLng object and Question if it's contained in the circle:
google.maps.event.addListener(markerCenter, 'dragend', function() {
latLngCenter = new google.maps.LatLng(markerCenter.position.lat(), markerCenter.position.lng());
bounds = circle.getBounds();
noteA.text(bounds.contains(latLngA));
noteB.text(bounds.contains(latLngB));
});
google.maps.event.addListener(markerA, 'dragend', function() {
latLngA = new google.maps.LatLng(markerA.position.lat(), markerA.position.lng());
noteA.text(bounds.contains(latLngA));
});
google.maps.event.addListener(markerB, 'dragend', function() {
latLngB = new google.maps.LatLng(markerB.position.lat(), markerB.position.lng());
noteB.text(bounds.contains(latLngB));
});
google.maps.event.addListener(markerCenter, 'click', function() {
infoCenter.open(map, markerCenter);
});
google.maps.event.addListener(markerA, 'click', function() {
infoA.open(map, markerA);
});
google.maps.event.addListener(markerB, 'click', function() {
infoB.open(map, markerB);
});
google.maps.event.addListener(markerCenter, 'drag', function() {
infoCenter.close();
noteA.html("draggin…");
noteB.html("draggin…");
});
google.maps.event.addListener(markerA, 'drag', function() {
infoA.close();
noteA.html("draggin…");
});
google.maps.event.addListener(markerB, 'drag', function() {
infoB.close();
noteB.html("draggin…");
});
};body {
margin: 0;
padding: 0
}
html,
body,
#map {
height: 100%;
font-family: Arial, sans-serif;
font-size: .9em;
color: #fff;
}
#note {
text-align: center;
padding: .3em; 10px;
background: #009ee0;
}
.bool {
font-style: italic;
color: #313131;
}
.info {
display: inline-block;
width: 40%;
text-align: center;
}
.infowin {
color: #313131;
}
#title,
.bool{
font-weight: bold;
}<div id="note">
<span id="title">»Inside the circle?«</span>
<hr />
<span class="info">Marker <strong>A</strong>:
<span id="a" class="bool"></span>
</span> ←♦→
<span class="info">Marker <strong>B</strong>:
<span id="b" class="bool"></span>
</span>
</div>
<div id="map">test</div>
<script src="https://maps.googleapis.com/maps/api/js?callback=init&libraries=&v=weekly&key=YOUR_API_KEY" async></script>