File: add_remove_layers.html

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leaflet 0.7.3~dfsg-1
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<!DOCTYPE html>
<html>
<head>
    <title>Leaflet debug page</title>

    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">

    <link rel="stylesheet" href="../../dist/leaflet.css" />

    <link rel="stylesheet" href="../css/screen.css" />
    <script type='text/javascript' src='http://code.jquery.com/jquery-1.8.0.js'></script>

    <script>
        L_PREFER_CANVAS = true;
        $(document).ready(function() {
            var map;
            var myLayerGroup = new L.LayerGroup();

            initmap();


            function initmap() {

                // set up the map
                map = new L.Map('map');

                // create the tile layer with correct attribution
                var osmUrl = 'http://a.tile.openstreetmap.org/{z}/{x}/{y}.png';
                var osmAttrib = 'Map data © OpenStreetMap contributors';
                var osm = new L.TileLayer(osmUrl, { minZoom: 1, maxZoom: 17, attribution: osmAttrib, detectRetina: true });
                map.addLayer(osm);
                map.fitBounds(new L.LatLngBounds([51,7],[51,7]));
                drawTestLine();


            };

            function drawTestLine() {
                var lat = 51;
                var long = 7;
                for (var i = 0; i < 50; i++) {

                    var myCircle = new L.Circle(new L.LatLng(lat, long),3);
                    myCircle.on('click',
                        function (e) {
                            popup = new L.Popup();
                            popup.setLatLng(this.getLatLng());

                            var popuptxt = "Hello!";
                            alert("I am the click function");
                                    popup.setContent(popuptxt);

                                    map.openPopup(popup);


                        });
                    myLayerGroup.addLayer(myCircle);
                        lat = lat + 0.0001;
                        long = long + 0.0001;

                }

            map.addLayer(myLayerGroup);

            };

            $("#b1").click(function() {
              map.addLayer(myLayerGroup);
            });

            $("#b2").click(function() {
              map.removeLayer(myLayerGroup);
            });

        });
    </script>

    <script src="../leaflet-include.js"></script>
</head>
<body>
    <div id="map"></div>
    <div id="buttons">
        <button type="button" id="b1"> Add Layer</button>
        <button type="button" id="b2"> Remove Layer</button>
    </div>
</body>
</html>