3

現在、ユーザーの地理位置情報にマーカーを表示するマップがあります。場所のオートコンプリートに設定されたテキスト入力フィールドがあります。ユーザーが都市名を検索すると、その場所に新しいマーカーが配置されます。ただし、古い位置情報マーカーは残ります。古いマーカーを削除するか、マップ上にマーカーが 1 つだけになるように移動します。これどうやってするの？

これが私のコードです：

<html>
<head>
    <script>
    var map;

    function initialize() {
        var mapOptions = {
            zoom: 12
     };
    map = new google.maps.Map(document.getElementById('map-canvas'),
    mapOptions);

    // Get GEOLOCATION
    if(navigator.geolocation) {
      navigator.geolocation.getCurrentPosition(function(position) {
        var pos = new google.maps.LatLng(position.coords.latitude,
                                         position.coords.longitude);

        map.setCenter(pos);
        var marker = new google.maps.Marker({
            position: pos,
            map: map,
            draggable:true
        });
      }, function() {
        handleNoGeolocation(true);
      });
    } else {
      // Browser doesn't support Geolocation
      handleNoGeolocation(false);
    }
    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
      };

      map.setCenter(options.position);

    }

// get places auto-complete when user type in location-text-box
    var input = /** @type {HTMLInputElement} */(
  document.getElementById('location-text-box'));


   var autocomplete = new google.maps.places.Autocomplete(input);
    autocomplete.bindTo('bounds', map);

    var infowindow = new google.maps.InfoWindow();
    var marker = new google.maps.Marker({
      map: map,
      anchorPoint: new google.maps.Point(0, -29),
      draggable:true
    });

    google.maps.event.addListener(autocomplete, 'place_changed', function() {
      infowindow.close();
      marker.setVisible(false);
      var place = autocomplete.getPlace();
      if (!place.geometry) {
        return;
      }

 // If the place has a geometry, then present it on a map.
    if (place.geometry.viewport) {
       map.fitBounds(place.geometry.viewport);
    } else {
      map.setCenter(place.geometry.location);
      map.setZoom(17);  // Why 17? Because it looks good.
    }
    marker.setIcon(/** @type {google.maps.Icon} */({
      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(35, 35)
    }));
    marker.setPosition(place.geometry.location);
    marker.setVisible(true);

    var address = '';
    if (place.address_components) {
        address = [
        (place.address_components[0] && place.address_components[0].short_name || ''),
        (place.address_components[1] && place.address_components[1].short_name || ''),
        (place.address_components[2] && place.address_components[2].short_name || '')
      ].join(' ');
    }

  });



}

google.maps.event.addDomListener(window, 'load', initialize);
        </script>
  </head>
  <body>
        <div>
              <input type="text" id="location-text-box">
              <div id="map-canvas"></div>
        </div>
  </body>
  </html>
4

2 に答える 2

15

マーカーをグローバルにし、非表示にするか、新しい場所に移動します

作業コードスニペット:

var map;
var marker;

function initialize() {
  var mapOptions = {
    zoom: 12
  };
  map = new google.maps.Map(document.getElementById('map-canvas'),
    mapOptions);

  // Get GEOLOCATION
  if (navigator.geolocation) {
    navigator.geolocation.getCurrentPosition(function(position) {
      var pos = new google.maps.LatLng(position.coords.latitude,
        position.coords.longitude);

      map.setCenter(pos);
      marker = new google.maps.Marker({
        position: pos,
        map: map,
        draggable: true
      });
    }, function() {
      handleNoGeolocation(true);
    });
  } else {
    // Browser doesn't support Geolocation
    handleNoGeolocation(false);
  }

  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
    };

    map.setCenter(options.position);
    marker = new google.maps.Marker({
      position: options.position,
      map: map,
      draggable: true
    });

  }

  // get places auto-complete when user type in location-text-box
  var input = /** @type {HTMLInputElement} */
    (
      document.getElementById('location-text-box'));


  var autocomplete = new google.maps.places.Autocomplete(input);
  autocomplete.bindTo('bounds', map);

  var infowindow = new google.maps.InfoWindow();
  marker = new google.maps.Marker({
    map: map,
    anchorPoint: new google.maps.Point(0, -29),
    draggable: true
  });

  google.maps.event.addListener(autocomplete, 'place_changed', function() {
    infowindow.close();
    marker.setVisible(false);
    var place = autocomplete.getPlace();
    if (!place.geometry) {
      return;
    }

    // If the place has a geometry, then present it on a map.
    if (place.geometry.viewport) {
      map.fitBounds(place.geometry.viewport);
    } else {
      map.setCenter(place.geometry.location);
      map.setZoom(17); // Why 17? Because it looks good.
    }
    marker.setIcon( /** @type {google.maps.Icon} */ ({
      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(35, 35)
    }));
    marker.setPosition(place.geometry.location);
    marker.setVisible(true);

    var address = '';
    if (place.address_components) {
      address = [
        (place.address_components[0] && place.address_components[0].short_name || ''), (place.address_components[1] && place.address_components[1].short_name || ''), (place.address_components[2] && place.address_components[2].short_name || '')
      ].join(' ');
    }

  });



}

google.maps.event.addDomListener(window, 'load', initialize);
html,
body,
#map-canvas {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js?libraries=geometry,places"></script>
<div style="height:100%; width:100%">
  <input type="text" id="location-text-box" />
  <div id="map-canvas"></div>
</div>

于 2015-02-08T19:31:05.460 に答える