Question

12

Removing leaflet layers and L.marker method

rated 0 times [ 13] [ 1] / answers: 1 / hits: 51524 / 11 Years ago, mon, december 23, 2013, 12:00:00

I was wondering if anyone knows how or if you can actually remove a layer of points after adding them using this convention:

var pointsLayer, someFeatures = [{

            //Hard coded for now

            type: Feature,

            properties: {

                name: Company A,

                show_on_map: true,

                icon: 'img/violations.png'

            },

            geometry: {

                type: Point,

                coordinates: [43.22519, -107.69348]

            }

        }, {

            type: Feature,

           .

           .

           .

   }];

for(w=0; w < someFeatures.length; w++){

                pointsLayer = L.marker(someFeatures[w].geometry.coordinates, {icon: violations})   

                    .bindPopup(Company: +someFeatures[w].properties.name);

                    //add map points 

                    map.addLayer(pointsLayer);

            }

The typical removeLayer(pointsLayer); within a similar for loop does not work for me. But, that does not mean that there isn't a way to loop through. I am just not sure exactly how. I am trying to add points, which is working, and then remove them on an event (not working). Any ideas?

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aden

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3 Years ago

answered 11 Years ago parker · Accepted Answer

Instead of adding all markers directly on the map, you can add the markers on a separate layer (i.e. var markers = new L.FeatureGroup();) and then add that layer on the map (map.addLayer(markers);) outside the loop.

For example,

http://jsfiddle.net/9BXL7/

html

<button>remove all markers</button>

<div id=map></div>

css

html, body, #map {

    width: 100%;

    height: 100%;

    padding: 0;

    margin: 0;

}

js

var cloudmade = L.tileLayer('http://{s}.tile.cloudmade.com/{key}/997/256/{z}/{x}/{y}.png', {

    maxZoom: 18,

    attribution: 'Map data &copy; 2011 OpenStreetMap contributors, Imagery &copy; 2011 CloudMade',

    key: 'BC9A493B41014CAABB98F0471D759707'

});



var map = L.map('map')

    .setView([50.5, 30.51], 15)

    .addLayer(cloudmade);



var markers = new L.FeatureGroup();



function getRandomLatLng(map) {

    var bounds = map.getBounds(),

        southWest = bounds.getSouthWest(),

        northEast = bounds.getNorthEast(),

        lngSpan = northEast.lng - southWest.lng,

        latSpan = northEast.lat - southWest.lat;



    return new L.LatLng(

    southWest.lat + latSpan * Math.random(),

    southWest.lng + lngSpan * Math.random());

}



function populate() {

    for (var i = 0; i < 10; i++) {

        var marker = L.marker(getRandomLatLng(map));

        marker.bindPopup(<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Donec odio. Quisque volutpat mattis eros. Nullam malesuada erat ut turpis. Suspendisse urna nibh, viverra non, semper suscipit, posuere a, pede.</p><p>Donec nec justo eget felis facilisis fermentum. Aliquam porttitor mauris sit amet orci. Aenean dignissim pellentesque.</p>, {

            showOnMouseOver: true

        });

        markers.addLayer(marker);

    }

    return false;

}



map.addLayer(markers);



populate();

function removeAllMarkers(){

    map.removeLayer(markers);

}

document.querySelector('button').onclick=function(){removeAllMarkers()};

Should you need to DELETE or clear the markers layer to swap out the points in the future use:

markers.clearLayers();