我正在尝试构建一个谷歌地图应用程序，它具有一些基于用户输入的功能。所以我有这个大型的融合表，里面有很多与地点相关的维基百科文章。我试图让用户输入一个地址，并在距离搜索点3或10英里的范围内显示结果。这是我的代码。我遇到的第一个问题是当我搜索时我不能清理现有的标记然后我需要显示结果。任何关于如何做的想法？ 方向部分很有效。
<!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>