javascript - 查找离我的地理位置最近的标记 Google Maps API V3

Question

我有一个脚本显示我已在我的页面中实现的 Google map ，目前它显示了雷达搜索生成的一系列标记。我想我可能已将这些生成的标记放入一个数组中，但我不确定该怎么做。我还查阅了“haversine 公式”，因为这似乎是计算地理位置与数组中的点之间距离的一种方法。我希望能够使用标签 ID“#findMe”来执行搜索，因此单击它将找到离我的地理位置最近的标记，然后使用它打印警报。我在使用 google api 内置方法时遇到了困难，但我再次认为我需要将标记放入数组中。

修改后的代码 - 这是正确的 Dr.Molle 吗？

    jQuery(function($){

  var $overlay = $('.overlay'),
      resize = true,
      map;
    var service;
    var marker = [];
    var pos;
    var infowindow;
    var placeLoc


function initialize() {
  /*var mapOptions = {
    zoom: 8,
    center: new google.maps.LatLng(-34.397, 150.644),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };
  map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

}*/
var mapOptions = {
    zoom: 15
  };
  map = new google.maps.Map(document.getElementById('map-canvas'),
      mapOptions);

  // Try HTML5 geolocation
  if(navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {

            var pos = new google.maps.LatLng(position.coords.latitude,position.coords.longitude);

        var request = {
      location:pos,
      radius:1000,

  };

  infowindow = new google.maps.InfoWindow();
  var service = new google.maps.places.PlacesService(map);
  service.nearbySearch(request,callback);
      pos = new google.maps.LatLng(position.coords.latitude,
                                       position.coords.longitude);


        infowindow = new google.maps.InfoWindow({
        map: map,
        position: pos,
        content: 'You Are Here'
      });
        $('#findMe').data('pos',pos);

      map.setCenter(pos);
    }, function() {
      handleNoGeolocation(true);
    });
  } else {
    // Browser doesn't support Geolocation
    handleNoGeolocation(false);
  }



  function callback(results, status) {
      var markers = [];
  if (status == google.maps.places.PlacesServiceStatus.OK) {
    for (var i = 0; i < results.length; i++) {
      markers.push(createMarker(results[i]));
    }
  }
  $('#findMe').data('markers',markers);
}
}

function createMarker(place) {
  placeLoc = place.geometry.location;
  var marker = new google.maps.Marker({
    map: map,
    position: place.geometry.location,
    icon: {
        path: google.maps.SymbolPath.CIRCLE,
        scale: 8,
        fillColor:'00a14b',
        fillOpacity:0.3,
        fillStroke: '00a14b',       
        strokeWeight:4,
        strokeOpacity: 0.7
    },



  });


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

function handleNoGeolocation(errorFlag) {
  if (errorFlag) {
    var content = 'Error: The Geolocation service failed.';
  } else {
    var content = 'Error: Your browser doesn\'t support geolocation.';
  }

  var options = {
    map: map,
    position: new google.maps.LatLng(60, 105),
    content: content
  };

  var infowindow = new google.maps.InfoWindow(options);
  map.setCenter(options.position);
}

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

$('#show').click(function(){

    $overlay.show();

  if ( resize ){
    google.maps.event.trigger(map, 'resize');
    resize = false;
  }

});

$('.overlay-bg').click(function(){

    $overlay.hide();

});

$( "#findMe" ).click(function() {

  var pos     = $(this).data('pos'),
      markers = $(this).data('markers'),
      closest;

  if(!pos || !markers){
    return;
  }

  $.each(markers,function(){
    var distance=google.maps.geometry.spherical
                  .computeDistanceBetween(this.getPosition(),pos);
    if(!closest || closest.distance > distance){
      closest={marker:this,
               distance:distance}
    }
  });
  if(closest){
    //closest.marker will be the nearest marker, do something with it
    //here we simply trigger a click, which will open the InfoWindow 
    google.maps.event.trigger(closest.marker,'click')
  }
});


});

Answer 1

用这些标记填充数组:

1. 让 createMarker 函数返回标记，在函数末尾添加:

   return marker;
   

2. 存储数组(例如作为#findMe 的数据属性)

   function callback(results, status) {
     var markers=[];
     if (status == google.maps.places.PlacesServiceStatus.OK) {
       for (var i = 0; i < results.length; i++) {
         markers.push(createMarker(results[i]));
       }
     }
     $('#findMe').data('markers',markers);
   }
   

还将地理定位返回的位置存储在某处(例如，也作为#findMe 的数据):

  //add this after defining pos in the success-callback of geolocation
  $('#findMe').data('pos',pos);

要找到最近的标记，您可以使用方法 computeDistanceBetween - 几何库的方法(不要忘记加载库，默认情况下不加载)

$( "#findMe" ).click(function() {

  var pos     = $(this).data('pos'),
      markers = $(this).data('markers'),
      closest;

  if(!pos || !markers){
    return;
  }

  $.each(markers,function(){
    var distance=google.maps.geometry.spherical
                  .computeDistanceBetween(this.getPosition(),pos);
    if(!closest || closest.distance > distance){
      closest={marker:this,
               distance:distance}
    }
  });
  if(closest){
    //closest.marker will be the nearest marker, do something with it
    //here we simply trigger a click, which will open the InfoWindow 
    google.maps.event.trigger(closest.marker,'click')
  }
});