移动地图时搜索

Question

我在许多城市都有组织，我的数据库中有完整的地址。我使用 geocoding and also display list of organization in page. Then I try to locate user using geolocation.

在地图上放置标记

我的问题是如何仅在用户位置附近显示组织并在用户移动地图时自动更新组织列表（当我说移动地图时我的意思是像 airbnb 一样移动）。

Answer 1

在 Earth3DMap.com 的工作中，我回答了你的问题。

Live demo is here.

不要忘记加载地点 API。检查演示的 HTML 代码。

这里是 javascript 代码：

var map;
var infowindow;
var service;
var request;
var currentLocation;
var newLat;
var newLng;
var newCurrLocation;
var latlngArray;
var marker;
var markers;
function initialize() {
  map = new google.maps.Map(document.getElementById('map-canvas'), {
    center: new google.maps.LatLng(48.1293954,11.556663), // Munich Germany
    zoom: 15
  });
  getMoveData()
    google.maps.event.addListener(map,'dragend',getMoveData) // All events are here https://google-developers.appspot.com/maps/documentation/javascript/examples/full/map-events
}

function getMoveData() {
    clearMarkers()
    currentLocation = map.getCenter()
    newCurrLocation = currentLocation.toString();
    newCurrLocation = newCurrLocation.replace('(', '');
    newCurrLocation = newCurrLocation.replace(')', '');

    latlngArray = new Array();
    latlngArray = newCurrLocation.split(",")
    for (a in latlngArray) {
            latlngArray[a] = parseFloat(latlngArray[a]);
    }
    newLat = latlngArray[0]
    newLng = latlngArray[1]
    map.setCenter({
        lat : newLat,
        lng : newLng
    });
    showPlaces()
}

function showPlaces(){
   request = {
    location: currentLocation,
    radius: 500,
    types: ['store'] // All types are here: https://developers.google.com/places/documentation/supported_types
  };
  infowindow = new google.maps.InfoWindow();
  service = new google.maps.places.PlacesService(map);
  service.nearbySearch(request, callback);
}
function callback(results, status) {
  if (status == google.maps.places.PlacesServiceStatus.OK) {
    for (var i = 0; i < results.length; i++) {
      createMarker(results[i]);
    }
  }
}
markers = [];
function createMarker(place) {
  var placeLoc = place.geometry.location;
  marker = new google.maps.Marker({
    map: map,
    position: place.geometry.location
  });
  markers.push(marker);

  google.maps.event.addListener(marker, 'click', function() {
    infowindow.setContent(place.name);
    infowindow.open(map, this);
  });
}

function clearMarkers() {
  for (var i = 0; i < markers.length; i++) {
    markers[i].setMap(null);
  }
  markers = [];

}

google.maps.event.addDomListener(window, 'load', initialize);

Answer 2

我正在尝试提供一个简单的方法来解决这个问题。

有一个函数getBounds()（在库下）。有了这个功能，你总能得到活动window.

的（lat，lon）范围

下面举个例子-

var map;
function initialize()
{
var mapOpt = {
  center:new google.maps.LatLng(51.508742,-0.120850),
  zoom:6,
  mapTypeId:google.maps.MapTypeId.ROADMAP
  };
map=new google.maps.Map(document.getElementById("googleMap"),mapOpt);
}

google.maps.event.addDomListener(window, 'load',initialize);

<script src="http://maps.googleapis.com/maps/api/js"></script>

<button onclick="alert(map.getBounds());">Get bounds</button>
<br><br>
<div id="googleMap"style="width:400px;height:300px;"></div>

更新-

地图缩放后拖拽后添加事件，请看-

How can I handle map move end using Google Maps for Android V2?
Google Map Api v3 drag event on map

认为这会对您有更多帮助:)

移动地图时搜索

Search When I Move the Map

html

javascript

google-maps-api-3

更新-