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how to remove markers in google maps v3

Posted on 2011-03-03
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Last Modified: 2012-05-11
I have spend quite some time searching for the answer to this and it seems to be a depreciated functionality for V3 and I can't find a clear exact way to deal with this so I though i  ought to run it past the experts!

Basically I have a map rebuild routine that runs when a route part is removed from a structure of route parts so I simply need to remove the corresponding marker from the map.

any help appreciated.
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Question by:Lmillard
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6 Comments
 
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Expert Comment

by:Albert Van Halen
ID: 35025065
Use this
// method to clear all markers
// usage : clearMarkers(map);
// arguments : map - instance of the map

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

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Author Comment

by:Lmillard
ID: 35025232
Looks like it should do what I want but for some reason it wont run in my rebuild routine.
I am initializing the initial map using the following code so not sure if I am creating a named instance.
Also this removes all markers, is there a way to remove just one?



var geocoder;
	var map;
	var bounds = new google.maps.LatLngBounds();
	var totalMarkers = 0;
// START THE WHOLE MAP BUSINESS GOING
	function initialize() {
		geocoder = new google.maps.Geocoder();
		var latlng = new google.maps.LatLng(51.397, -1.0);
		var myOptions = {
		  zoom: 8,
		  center: latlng,
		  mapTypeId: google.maps.MapTypeId.ROADMAP
		}
		map = new google.maps.Map(document.getElementById("gMapScreen"), myOptions);
	  }

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LVL 19

Expert Comment

by:Albert Van Halen
ID: 35025460
You have your map variable defined globally so that's good.
Can you show your rebuild routine or provide a link to your site ?

The method indeed remove all markers by iterating through the markers array of the map.
If you know specific properties of a marker that needs to be deleted you can rewrite the routine by iterating through the markers and delete the ones that meet the criteria.
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Author Comment

by:Lmillard
ID: 35025573
My site is on my localhost dev server at the moment so not possible to show that directly but here is a copy of my rebuild code.
At the moment I am running the initialize() function at the top to destroy the existing map and recreate from scratch but this is a bit heavy handed.
Could advise on how to add a unique id to a marker to allow for single deletion?
Sorry for the daft questions but I am very new to google maps.

showGmap is just a script that slides down the map screen so no real effect on the whole thing.
the ajax post returns a json array of route lat/lng from session vars in the form or GeoArray
// REBUILD THE MAP - CAN BE FIRED FROM ANY ACTION SUCH AS ADD ROUTE, DELETE ROUTE, LOADING PAGE
function rebuildMapCFC(basketId,defaultLatLng) {
	initialize();
	showGmap();
	var mydata = {data:[basketId]};
	$.post(httpPath+"assets/publicComps/basket.cfc", 
		   {method:"getBasketRoute",argumentCollection:$.toJSON(mydata), returnFormat:"json"}, function(geoArray) {

	var geoArray = $.evalJSON(geoArray);
	if(geoArray.length) {
	for (var i=0; i < geoArray.length; i++){
			varLoc = geoArray[i].split(',');
			myLat = varLoc[0]; myLng = varLoc[1];
			var latlng = new google.maps.LatLng(myLat,myLng)
	        map.setCenter(latlng);
			totalMarkers = totalMarkers +1;
			thisPos = latlng;
	        map.setCenter(latlng);
			marker = new google.maps.Marker({map: map, position: latlng});
			bounds.extend(latlng);
		}
		if(totalMarkers > 1) {
			map.fitBounds(bounds);
		}
		   } else {
			varLoc = defaultLatLng.split(',');
			myLat = varLoc[0]; myLng = varLoc[1];
			var latlng = new google.maps.LatLng(myLat,myLng)
	        map.setCenter(latlng);
		   }
		});
	}

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Accepted Solution

by:
Albert Van Halen earned 500 total points
ID: 35034242
I'm not quite sure if you can specify an alternative property in the marker object; I wouldn't do it -> tampering with 3rd party objects...
You could store each marker into an array of custom objects having an id and the marker.

Te delete a specific marker, loop through your array, find the specific id and delete the marker.
var markers = []; // create the array
for(var x = 0; x < 10; x++) {
   var marker = new google.maps.Marker({map: map, position: latlng}); // create a new marker
   markers.push({ "id": x, "marker": marker }); // store object (id, marker) in the array
}

// if you want to delete a specific marker, do it like this

// usage : deleteMarker(3)
// arguments : id - the id of the marker to delete
function deleteMarker(id) {
   var markCount = markers.length;
   for(var x = 0; x < markCount; x++) {
      if(markers[x].id == id) {
         var markerToDelete = markers.splice(x,1)[0].marker;
         markerToDelete.setMap(null);
         break;
      }
   }
}

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Author Closing Comment

by:Lmillard
ID: 35098191
Perfect result thank, sorry for the delay in response but I was sidelined for a few days.
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