我正在尝试构建一个谷歌地图应用程序，它具有基于用户输入的一些功能。所以我有这个大的融合表，里面有很多与地理点相关的维基百科文章。我试图让用户输入地址并在距搜索点 3 或 10 英里范围内显示结果。这是我的代码。我遇到的第一个问题是我在搜索时无法清理现有标记，然后我需要显示结果。关于如何做到这一点的任何想法？方向部分效果很好。
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style>
html, body, #map-canvas {
height: 100%;
margin: 0px;
padding: 0px
}
#panel {
position: absolute;
top: 5px;
left: 50%;
margin-left: -180px;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
}
</style>
<style>
#directions-panel {
height: 100%;
float: right;
width: 390px;
overflow: auto;
}
#map-canvas {
margin-right: 390px;
}
.dirhead{
background-color: rgb(30, 113, 160);
color: white;
font-size: 25px;
padding: 10px;
}
#control {
background: #fff;
padding: 5px;
font-size: 14px;
font-family: Arial;
border: 1px solid #ccc;
box-shadow: 0 2px 2px rgba(33, 33, 33, 0.4);
display: none;
}
@media print {
#map-canvas {
height: 500px;
margin: 0;
}
#directions-panel {
float: none;
width: auto;
}
}
</style>
<script type="text/javascript" src="http://www.google.com/jsapi"></script>
<script
src="http://google-maps-utility-library-v3.googlecode.com/svn/trunk/markerclusterer/src/markerclusterer.js">
</script>
<script
src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js">
</script>
<style type="text/css">
html { height: 100% }
body { height: 100%; margin: 0; padding: 0 }
#map-canvas { height: 100% }
</style>
<script type="text/javascript"
src="https://maps.googleapis.com/maps/api/js?sensor=false">
</script>
<script type="text/javascript">
google.load('visualization', '1');
var map;
var directionsDisplay;
var geocoder;
var directionsService = new google.maps.DirectionsService();
var markers = [];
function initialize(lat,lng) {
geocoder = new google.maps.Geocoder();
directionsDisplay = new google.maps.DirectionsRenderer();
var lat = 39.50;
var lng = -98.35;
var bounds;
var infoWindow = new google.maps.InfoWindow();
var markerClusterer = null;
directionsDisplay.setPanel(document.getElementById('directions-panel'));
var mapOptions = {
center: new google.maps.LatLng(lat,lng),
zoom: 6,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
map = new google.maps.Map(document.getElementById("map-canvas"),
mapOptions);
directionsDisplay.setMap(map);
// var query = "SELECT wikipedia_article,location FROM 1NICsBtZWfpi3kF_3OHsDe7Z9CU2biwyx_A4HRg";
// query = encodeURIComponent(query);
var control = document.getElementById('control');
control.style.display = 'block';
map.controls[google.maps.ControlPosition.TOP_CENTER].push(control);
google.maps.event.addListener(map, 'tilesloaded', function() {
loadmapHere(map,infoWindow,"regular");
});
}
function loadmapHere(map,infoWindow){
var swPoint = map.getBounds().getSouthWest();
var nePoint = map.getBounds().getNorthEast();
console.log(swPoint);
console.log(nePoint);
// Now, each individual coordinate
var swLat = swPoint.lat();
var swLng = swPoint.lng();
var neLat = nePoint.lat();
var neLng = nePoint.lng();
var query = "SELECT wikipedia_article,location FROM " + '1NICsBtZWfpi3kF_3OHsDe7Z9CU2biwyx_A4HRg where ST_INTERSECTS(location, RECTANGLE(LATLNG('+swLat+', '+swLng+'),LATLNG('+neLat+', '+neLng+')))';
var encodedQuery = encodeURIComponent(query);
// Construct the URL
var url = ['https://www.googleapis.com/fusiontables/v1/query'];
url.push('?sql=' + encodedQuery);
url.push('&key=key here);
url.push('&callback=?');
$.ajax({
url: url.join(''),
dataType: 'jsonp',
success: function (data) {
var rows = data['rows'];
for (var i in rows) {
var wiki_article = rows[i][0];
var position = rows[i][1];
var location = position.split(' ');
var lat = location[0];
var lng = location[1];
var positioni = new google.maps.LatLng(lat, lng);
var marker = new google.maps.Marker({
map: map,
position: positioni,
icon: new google.maps.MarkerImage('https://cdn1.iconfinder.com/data/icons/Map-Markers-Icons-Demo-PNG/32/Map-Marker-Ball-Pink.png'),
customInfo: wiki_article
});
markers.push(marker);
google.maps.event.addListener(markers[i], 'click', function(e) {
infoWindow.setContent('Wiki Link: <a href="'+decodeURIComponent(this.customInfo)+'" target="_new">' + decodeURIComponent(this.customInfo) + '</a>');
infoWindow.open(map, this);
document.getElementById('destination').value = this.position;
});
}
markerClusterer = new MarkerClusterer(map, markers);
}
});
}
function showMeNear() {
var infoWindow = new google.maps.InfoWindow();
var address = document.getElementById("milesAddress").value;
geocoder.geocode( { 'address': address}, function(results, status) {
if (status == google.maps.GeocoderStatus.OK) {
google.maps.event.clearListeners(map, 'tilesloaded');
hideMarkers(map,markers);
map.setCenter(results[0].geometry.location);
var layer = new google.maps.FusionTablesLayer({
query: "SELECT Address FROM 1NICsBtZWfpi3kF_3OHsDe7Z9CU2biwyx_A4HRg WHERE ST_INTERSECTS(location, RECTANGLE(LATLNG(37.3, -122.3), LATLNG(37.6, -121.9)))"
});
layer.setMap(map);
} else {
alert("Geocode was not successful for the following reason: " + status);
}
});
}
function calcRoute() {
var start = document.getElementById('initAddress').value;
var end = document.getElementById('destination').value;
var request = {
origin: start,
destination: end,
travelMode: google.maps.TravelMode.DRIVING
};
directionsService.route(request, function(response, status) {
if (status == google.maps.DirectionsStatus.OK) {
directionsDisplay.setDirections(response);
}
});
}
function hideMarkers(map, markers) {
/* Remove All Markers */
while(markers.length){
markers.pop().setMap(null);
}
console.log("Remove All Markers");
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>
<body>
<div id="control">
<strong>Search for Articles in:</strong>
<select id="milesMenu">
<option value="3">3 miles</option>
<option value="10">10 miles</option>
<option value="17">17 miles</option>
<option value="25">25 miles</option>
</select>
from <input type="text" id="milesAddress" placeholder="Enter Address"><button class="showNear" onclick="showMeNear()">Go</button><br />
<strong>Get Directions from here:</strong><input type="text" id="initAddress" placeholder="Enter Address"></input><input id="destination" type="hidden" value=""></input> to the clicked marker <button class="givemeRoute" onclick="calcRoute()">Go</button>
</div>
<div id="directions-panel"><div class="dirhead">Directions Here</div></div>
<div id="map-canvas"/>
</body>
</html>