我正在开发一个程序，该程序需要纬度和经度，并根据搜索查询生成附近的位置。一切都按预期工作，但是我对如何使用用户坐标更改起始坐标感到困惑。我最初的计划是让用户以以下形式输入经纬度：
<form id="mapCenterForm">
<label for="latitude">lat</label>
<input type="text" id="lat" name="latitude" placeholder="0.000000">
<label for="longitude">lng</label>
<input type="text" id="lng" name="longitude" placeholder="0.000000">
<br>
<input type="submit">
</form>
然后使用输入的信息来更改脚本中的变量lat和lng：
var map;
var lat= 34.16076;
var lng= -70.20507;
var map=new google.maps.LatLng(lat,lng);
function initMap() {
// Create the map.
var SET = {lat,lng};
map = new google.maps.Map(document.getElementById('map'),{
center: SET,zoom: 10
});
但是我不知道是否有替代地图加载的纬度和经度的方法。
很抱歉，如果这与发布的其他一些问题相似，我尝试使用Changing latitude and longitude google maps api作为指导，但对我没有太大帮助。
编辑：我收到答复并添加了完整的HTML代码，并进行了一些编辑，但实际上并没有更改SET变量。希望人们能够运行此程序，以便更好地了解问题。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0,user-scalable=no">
<meta charset="utf-8">
<title>Base Mapper</title>
<style>
#map {
height: 100%;
}
html,body {
height: 100%;
margin: 0;
padding: 0;
}
#right-panel {
font-family: 'Roboto','sans-serif';
line-height: 30px;
padding-left: 10px;
}
#right-panel select,#right-panel input {
font-size: 15px;
}
#right-panel select {
width: 100%;
}
#right-panel i {
font-size: 12px;
}
#right-panel {
font-family: Arial,Helvetica,sans-serif;
position: absolute;
right: 5px;
top: 60%;
margin-top: -395px;
height: 650px;
width: 200px;
padding: 5px;
z-index: 5;
border: 1px solid #999;
background: #fff;
}
h2 {
font-size: 22px;
margin: 0 0 5px 0;
}
ul {
list-style-type: none;
padding: 0;
margin: 0;
height: 580px;
width: 200px;
overflow-y: scroll;
}
li {
background-color: #f1f1f1;
padding: 5px;
text-overflow: ellipsis;
white-space: nowrap;
overflow: hidden;
}
li:nth-child(odd) {
background-color: #fcfcfc;
}
#more {
width: 100%;
margin: 5px 0 0 0;
}
input[type=text],select {
width: 100%;
padding: 12px 20px;
margin: 8px 0;
display: inline-block;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.container {
border-radius: 5px;
background-color: #f2f2f2;
padding: 20px;
width:70%
}
</style>
<div class="container">
<form id="mapCenterForm">
<label for="latitude">lat</label>
<input type="text" id="lat" name="latitude" placeholder="0.000000">
<label for="longitude">lng</label>
<input type="text" id="lng" name="longitude" placeholder="0.000000">
<br>
<button onclick = "change_center()">
Submit
</button>
</form>
<div id="map" style="height: 500px"></div>
</div>
<script>
var red_icon = 'http://maps.google.com/mapfiles/ms/icons/red-dot.png' ;
var map;
var lat= 41.18076;
var lng= -73.20537;
//THE FOLLOWING LINE WAS REMOVED
//var map=new google.maps.LatLng(lat,zoom: 13
});
function change_center() {
var newLat = document.getElementById("lat").value;
var newLng = document.getElementById("lng").value;
var SET = {newLat,newLng};
map.setCenter(new google.maps.LatLng(newLat,newLng));
}
// Create the places service.
var service = new google.maps.places.PlacesService(map);
var getNextPage = null;
var moreButton = document.getElementById('more');
moreButton.onclick = function() {
moreButton.disabled = true;
if (getNextPage) getNextPage();
};
// Perform a nearby search.
service.nearbySearch(
{location: SET,radius: 7500,keyword: "library"},function(results,status,pagination) {
if (status !== 'OK') return;
createMarkers(results);
moreButton.disabled = !pagination.hasnextPage;
getNextPage = pagination.hasnextPage && function() {
pagination.nextPage();
};
});
}
function createMarkers(places) {
var bounds = new google.maps.LatLngBounds();
var placesList = document.getElementById('places');
for (var i = 0,place; place = places[i]; i++) {
var image = {
url: place.icon,size: new google.maps.Size(71,71),origin: new google.maps.Point(0,0),anchor: new google.maps.Point(17,34),scaledSize: new google.maps.Size(25,25)
};
var marker = new google.maps.Marker({
map: map,icon: red_icon,title: place.name,position: place.geometry.location
});
var li = document.createElement('li');
li.textContent = place.name;
placesList.appendChild(li);
bounds.extend(place.geometry.location);
}
map.fitBounds(bounds);
}
</script>
</head>
<body>
<div id="map"></div>
<div id="right-panel">
<h2>Locations</h2>
<ul id="places"></ul>
<button id="more">More Results</button>
</div>
<script src="https://maps.googleapis.com/maps/api/js?key=MY_API_KEY&libraries=places&callback=initMap" async defer></script>
</body>
</html>