Google Maps API {removeOverlay (marcador);} y {clearOverlays ();}

StackOverflow https://stackoverflow.com/questions/1843817

Pregunta

Tengo un problema en la eliminación de los viejos marcadores sin quitar el punto central del círculo "también es un marcador"

la fuente :::: 

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta http-equiv="content-type" content="text/html; charset=utf-8"/>
    <script src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=ABQIAAAA1XbMiDxx_BTCY2_FkPh06RRaGTYH6UMl8mADNa0YKuWNNa8VNxQEerTAUcfkyrr6OwBovxn7TDAH5Q"></script>
    <script type="text/javascript">
    //<![CDATA[
    var map;
var container;
var opacity = 0.4;
var circle;
var centerMarker;
var circleUnits;
var circleRadius;
var zoom = 2;
var centerPoint = new GLatLng(40,-100);
var laat;
var lnng;

    function load() {
      if (GBrowserIsCompatible()) {

        map = new GMap2(document.getElementById('map'),{draggableCursor:"crosshair"});
        map.addControl(new GSmallMapControl());
        map.addControl(new GMapTypeControl());
        map.setCenter(new GLatLng(40, -100), 4);
      }
    }

function drawCircle() {
    var oUnitsMI = document.getElementById('unitsMI');
    var oUnitsKM = document.getElementById('unitsKM');
    var oRadius = document.getElementById('radiusInput');
    oRadius.value = oRadius.value ? oRadius.value : 500;

    if (oRadius.value.match(/[^\d.]/)) {
        alert("Don't be silly. Enter a number for radius");
        return;
    }
    if (oRadius.value > 9999) {
    }

    circleRadius = oRadius.value;

    if (oUnitsKM.checked) {
        circleUnits = 'KM';
    }
    else {
        circleUnits = 'MI';
    }

    doDrawCircle();
}


function doDrawCircle(){

    if (circle) {
        map.removeOverlay(circle);

    }


    if (centerMarker) {
    //map.removeOverlay(marker);
        map.setCenter(centerMarker.getLatLng())
    }
    else {
        centerMarker = new GMarker(map.getCenter(),{draggable:true});
        GEvent.addListener(centerMarker,'dragend',drawCircle)
        map.addOverlay(centerMarker);
    }

    var center = map.getCenter();

    var bounds = new GLatLngBounds();


    var circlePoints = Array();

    with (Math) {
        if (circleUnits == 'KM') {
            var d = circleRadius/6378.8;    // radians
        }
        else { //miles
            var d = circleRadius/3963.189;  // radians
        }
laat=center.lat();
lnng=center.lng();
        var lat1 = (PI/180)* center.lat(); // radians
        var lng1 = (PI/180)* center.lng(); // radians

        for (var a = 0 ; a < 361 ; a++ ) {
            var tc = (PI/180)*a;
            var y = asin(sin(lat1)*cos(d)+cos(lat1)*sin(d)*cos(tc));
            var dlng = atan2(sin(tc)*sin(d)*cos(lat1),cos(d)-sin(lat1)*sin(y));
            var x = ((lng1-dlng+PI) % (2*PI)) - PI ; // MOD function
            var point = new GLatLng(parseFloat(y*(180/PI)),parseFloat(x*(180/PI)));
            circlePoints.push(point);
            bounds.extend(point);
        }

        if (d < 1.5678565720686044) {
            circle = new GPolygon(circlePoints, '#000000', 2, 1, '#000000', 0.25);  
        }
        else {
            circle = new GPolygon(circlePoints, '#000000', 2, 1);   
        }
        map.addOverlay(circle); 

        map.setZoom(map.getBoundsZoomLevel(bounds)-2);
        searchLocationsNear(center);
    }
}

   function searchLocationsNear(center) {

     var radius = document.getElementById('radiusInput').value;
     var searchUrl = 'phpsqlsearch_genxml.php?lat=' + laat + '&lng=' + lnng + '&radius=' + radius;
     GDownloadUrl(searchUrl, function(data) {
       var xml = GXml.parse(data);
       var markers = xml.documentElement.getElementsByTagName('marker');
     if (marker) {
        map.removeOverlay(marker);

    }

//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<


     //map.removeOverlay(marker);   /*how to remove the old markers without removing the central point mark. */
        //map.clearOverlays();


//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

       var sidebar = document.getElementById('sidebar');
       sidebar.innerHTML = '';
       if (markers.length == 0) {
         sidebar.innerHTML = 'No results found.';
         map.setCenter(new GLatLng(40, -100), 4);
         return;
       }

       var bounds = new GLatLngBounds();
       for (var i = 0; i < markers.length; i++) {
         var name = markers[i].getAttribute('name');
         var address = markers[i].getAttribute('address');
         var distance = parseFloat(markers[i].getAttribute('distance'));
         var point = new GLatLng(parseFloat(markers[i].getAttribute('lat')),
                                 parseFloat(markers[i].getAttribute('lng')));

         var marker = createMarker(point, name, address);
         map.addOverlay(marker);
         var sidebarEntry = createSidebarEntry(marker, name, address, distance);
         sidebar.appendChild(sidebarEntry);
         bounds.extend(point);
       }
       map.setCenter(bounds.getCenter(), map.getBoundsZoomLevel(bounds-2));
     });
   }

    function createMarker(point, name, address) {
      var marker = new GMarker(point);
      var html = '<b>' + name + '</b> <br/>' + address;
      GEvent.addListener(marker, 'click', function() {
        marker.openInfoWindowHtml(html);
      });
      return marker;
    }

    function createSidebarEntry(marker, name, address, distance) {
      var div = document.createElement('div');
      var html = '<b>' + name + '</b> (' + distance.toFixed(1) + ')<br/>' + address;
      div.innerHTML = html;
      div.style.cursor = 'pointer';
      div.style.marginBottom = '5px'; 
      GEvent.addDomListener(div, 'click', function() {
        GEvent.trigger(marker, 'click');
      });
      GEvent.addDomListener(div, 'mouseover', function() {
        div.style.backgroundColor = '#eee';
      });
      GEvent.addDomListener(div, 'mouseout', function() {
        div.style.backgroundColor = '#fff';
      });
      return div;
    }
    //]]>
  </script>
  </head>

  <body onload="load()" onunload="GUnload()">
  Radius: <input name="radiusInput" id="radiusInput" size="10" ><br>
                <input type="radio" name="units" id="unitsMI" checked value="MI">Miles<br>
                <input type="radio" name="units" id="unitsKM" value="KM">Kilometers<br><br>
                <input type="submit" value="Draw" onclick="drawCircle()"><br><br>

    <br/>
<div style="width:600px; font-family:Arial, 
sans-serif; font-size:11px; border:1px solid black">
  <table> 
    <tbody> 
      <tr>
        <td width="200" valign="top"> <div id="sidebar" style="overflow: auto; height: 400px; font-size: 11px; color: #000"></div>

        </td>
        <td> <div id="map" style="overflow: hidden; width:400px; height:400px"></div> </td>

      </tr> 
    </tbody>
  </table>
</div>    
  </body>
</html>
¿Fue útil?

Solución

La API de Google Maps no tiene una función para borrar todos los marcadores excepto uno.

Lo que puede hacer es mantener una matriz global de referencias de marcador para los marcadores que usted va a querer quitar. Cuando se desea eliminarlos, bucle a través de esa matriz ellas la eliminación de uno por uno.

Esto puede parecer un poco posiblemente ineficaz, pero map.clearOverlays () hace exactamente lo mismo, pero los bucles a través de una matriz interna de superposiciones que usted no tiene acceso a. 

// global array of marker references
var gmarkers = [];

function createMarker(point, name, address) {
  var marker = new GMarker(point);
  gmarkers.push(marker); // store the reference
  ...
}

// remove those markers
for (var i=0; i<gmarkers.length; i++) {
  map.removeOverlay(gmarkers[i]);
}
// Wipe the array
gmarkers = [];
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