I built a heatmap on Leaflet.
My first goal is to see the heatmap when you open the map. The second goal is not to view the heatmap if the zoom level is greater than 9.
I tried this :
if (map.getZoom() >9 {
map.removeLayer (heatmapLayer);
};
But it did not work.
Would you have any suggestions ?
Thanks !
Here is the code :
<!DOCTYPE html>
<html lang="en">
<head>
<title>Application - version 1.0</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="description" content="">
<meta name="author" content="">
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.6.3/leaflet.css" />
<link rel="stylesheet" href="style_p.css" />
<style type="text/css">
html, body, #map {
margin: 0;
margin-top: 0%;
width: 100%;
height: 100%;
};
</style>
</head>
<!-- Favicon -->
<link rel="icon" href="california.ico" />
<body>
<div id="map"></div>
<script src="http://cdn.leafletjs.com/leaflet-0.6.3/leaflet-src.js"></script>
<script src="http://maps.google.com/maps/api/js?v=3.2&sensor=false"></script>
<script src="jquery.js"></script>
<script type="text/javascript" src="heatmap.js"></script>
<script type="text/javascript" src="heatmap-leaflet.js"></script>
<script type="text/javascript" src="sloopjohnb.js"></script>
<script src="google.js"></script>
<script src="leaflet_search.js"></script>
<script type="text/javascript" charset="utf-8">
$(function() {
var osm = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png');
var base = new L.TileLayer('http://129.206.74.245:8001/tms_r.ashx?x={x}&y={y}&z={z}');
var ggl2 = new L.Google('SATELLITE');
var heatmapLayer;
heatmapLayer = L.TileLayer.heatMap({
radius: 10,
opacity: 0.8,
gradient: {
0.45: "rgb(0,0,255)",
0.55: "rgb(0,255,255)",
0.65: "rgb(0,255,0)",
0.95: "yellow",
1.0: "rgb(255,0,0)"
}
});
var Data1={
max: 1,
data: sloopjohnb
};
heatmapLayer.addData(Data1.data);
var baseMaps = {
"Fond OSM": osm,
"Fond de carte de base": base,
"Photo. aérienne Google" : ggl2
};
var overlayMaps = {
'Heatmap': heatmapLayer
};
map = new L.Map('map', {
minZoom : 1,
maxZoom : 11,
boxZoom : true,
layers: [base, heatmapLayer]
});
var controls = L.control.layers(baseMaps, overlayMaps, {position: 'bottomright'});
controls.addTo(map);
map.addControl(L.control.search());
L.control.scale().addTo(map);
map.attributionControl.addAttribution('Heatmap.js');
map.setView(new L.LatLng(39.291,-5.9765),2);
// Disparition de la heatmap en fct du zoom
map.on('zoomend', function () {
if (map.getZoom() > 9) {
map.removeLayer(heatmapLayer);
}
});
});
</script>
</body>
</html>
Are you sure you are creating the listener correctly?
For example, this seems like it should be called when the user zooms. So something like:
Edited
map.on('zoomend', function () {
if (map.getZoom() > 9 && map.hasLayer(heatmapLayer)) {
map.removeLayer(heatmapLayer);
}
if (map.getZoom() < 9 && map.hasLayer(heatmapLayer) == false)
{
map.addLayer(heatmapLayer);
}
});
If you ONLY want the layer added/removed based on zoom, don't add it to your layer control here:
var controls = L.control.layers(baseMaps, overlayMaps, {position: 'bottomright'});
controls.addTo(map);
You will just have to make sure you are doing your adding/removing when it is necessary. Try messing with this set up a little and see where you get. Also, the Documentation is well written regarding the use of L.tileLayer
You can use the leaflet-zoom-show-hide library to do it. This will automatically show/hide your layers as you zoom.
zsh = new ZoomShowHide(map);
var marker1 = L.marker([50.096, 14.425]);
// minzoom, maxzoom
zsh.addLayer(marker1, 10, 13);
var marker2 = L.marker([50.076, 14.425]);
zsh.addLayer(marker2, 8, null);
Related
I am trying to display open radioactivity data from the German Agency for Protection of Radiation (https://www.imis.bfs.de/geoportal/).
They have a nice GeoJson API.
I can display the individual markers (points of radioactivity sensors), but cannot display the value feature.properties.value in a popup.
I tried onEachFeature but somehow it did not work. I searched for quite a bit, but could not find a solution
html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Radioaktivität</title>
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.7.1/dist/leaflet.css" />
<script src="https://unpkg.com/leaflet#1.7.1/dist/leaflet.js"></script>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="map"></div>
<script src="script.js"></script>
</body>
</html>
JavaScript:
let config = {
minZoom: 2,
maxZoom: 18,
};
const zoom = 7;
const lat = 51.7036;
const lng = 10.2166;
const map = L.map("map", config).setView([lat, lng], zoom);
let url = 'https://www.imis.bfs.de/ogc/opendata/ows?service=WFS&version=1.1.0&request=GetFeature&typeName=opendata:odlinfo_odl_1h_latest&outputFormat=application/json';
const response = fetch(url)
.then(response => response.json())
.then(response => {
L.geoJson(response, {
onEachFeature: function (feature, layer) {
layer.bindPopup(feature.properties.value);
}
}).addTo(map);
});
I'm trying to make the map move inside it, dragging the map to the side, so I can get around the map.
But this is only being possible onmousedown on map1, when choosing map2 the map does not move, it is not possible to drag it.
When clicking on the map1 button the map appears and it is possible to move within it, but after I click on the map2 button it is no longer possible to move within the map.
Follow the code of what is happening.
How could this be fixed?
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Map</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.6.0/dist/leaflet.css"/>
<script src="https://unpkg.com/leaflet#1.6.0/dist/leaflet.js"></script>
</head>
<body>
<div style="margin: 10px">
<button onclick="maps(['New York', 40.6971494, -74.2598757])">Map 1</button>
</div>
<div style="margin: 10px">
<button onclick="maps(['London', 51.528308, -0.3817849])">Map 2</button>
</div>
<div id="mapid" style="width: 200px; height: 200px; margin: 10px"></div>
<script>
function maps(location) {
var container = L.DomUtil.get('mapid');
if(container != null){
container._leaflet_id = null;
}
var map = L.map( 'mapid', {
center: [location[1], location[2]],
minZoom: 2,
zoom: 13
});
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
var m = L.marker([location[1], location[2]]).addTo(map).bindPopup(location[0])
}
</script>
</body>
</html>
I found the problem, I needed to change the way the map was initialized, follow the code below:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<title>Map</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.6.0/dist/leaflet.css"/>
<script src="https://unpkg.com/leaflet#1.6.0/dist/leaflet.js"></script>
</head>
<body>
<div style="margin: 10px">
<button onclick="maps(['New York', 40.6971494, -74.2598757])">Map 1</button>
</div>
<div style="margin: 10px">
<button onclick="maps(['London', 51.528308, -0.3817849])">Map 2</button>
</div>
<div id="mapid" style="width: 200px; height: 200px; margin: 10px"></div>
<script>
var map = null; //added
function maps(location) {
//var container = L.DomUtil.get('mapid'); //removed
//if(container != null){ //removed
// container._leaflet_id = null; //removed
//}
if (map !== undefined && map !== null) { map.remove(); }//added
map = L.map( 'mapid', { //alterated
center: [location[1], location[2]],
minZoom: 2,
zoom: 13
});
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
var m = L.marker([location[1], location[2]]).addTo(map).bindPopup(location[0])
}
</script>
</body>
</html>
What am I doing wrong? The intent is to have a few (say 6) leafletjs panes, each containing many markers and polylines, so the panes can be hidden independently. Here is a simplified program showing just two lines and markers in jsfiddle. The problem is, the polylines all get grouped in the same SVG and all get hidden together. Each pane in the example should show one polyline and one marker.
I don't want to remove the polylines from the map to hide them, then recreating them would not perform well.
If needed, the polylines could be drawn using D3 on top of the leaflet map but I was hoping it could all be done in leaflet.
Thanks!
JS:
'use strict';
document.addEventListener("DOMContentLoaded", function(event) {
var map = L.map('map').setView([30.5, -0.09], 2);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
var pane1 = map.createPane('pane1');
var pane2 = map.createPane('pane2');
function hide(pane) {
pane.style.display = 'none';
}
function show(pane) {
pane.style.display = '';
}
let icon = new L.Icon.Default();
function dr(pane, latlng){
L.polyline([[45.421, -75.697], latlng], {
weight: 2,
pane: pane
}).addTo(map);
L.marker(latlng, {
icon: icon,
pane: pane
}).addTo(map);
}
// define two locations with lines from Ottawa
dr(pane1, [ 42.3732216, -72.5198537 ]);
dr(pane2, [ 35.9606384, -83.9207392 ]);
function sleep(ms) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function loop(){
for( var i = 0; i<100; i++){
hide(pane1);
show(pane2);
await sleep(1000);
hide(pane2);
show(pane1);
await sleep(1000);
}
}
loop();});
HTML:
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.5.1/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet/1.6.0/leaflet-src.js" integrity="sha256-wc8X54qvAHZGQY6nFv24TKlc3wtO0bgAfqj8AutTIu0=" crossorigin="anonymous"></script>
<style>
html, body {
height: 100%;
margin: 0;
}
#map {
width: 900px;
height: 500px;
}
</style>
</head>
<body>
<div id='map'></div>
</body>
</html>
<script src="c.js"></script>
when you mouse over a cluster, Leaflet.markercluster should show the bounds of its markers. this is the (simplified) code I am using:
map = new L.Map('map');
L.tileLayer(
'https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
maxZoom: 13,
attribution: 'Map data © OpenStreetMap contributors'
}
).addTo(map);
map.setView([51.505, -0.09], 11);
let deflate_features = L.deflate({
minSize: 40,
markerCluster: true
});
deflate_features.addTo(map);
var polygon = L.polygon([
[51.509, -0.08],
[51.503, -0.06],
[51.51, -0.047]
]);
deflate_features.addLayer(polygon);
var polyline = L.polyline([
[51.52, -0.05],
[51.53, -0.10],
], {
color: 'red'
});
deflate_features.addLayer(polyline);
#map {position: absolute; top: 0; bottom: 0; left: 0; right: 0;}
<html>
<head>
<link href="https://unpkg.com/leaflet#1.3.3/dist/leaflet.css" rel="stylesheet" />
<link href="https://unpkg.com/leaflet.markercluster#1.3.0/dist/MarkerCluster.css" rel="stylesheet" />
<link href="https://unpkg.com/leaflet.markercluster#1.3.0/dist/MarkerCluster.Default.css" rel="stylesheet" />
<script src="https://unpkg.com/leaflet#1.3.3/dist/leaflet.js"></script>
<script src="https://unpkg.com/leaflet.markercluster#1.3.0/dist/leaflet.markercluster.js"></script>
<script src="https://unpkg.com/Leaflet.Deflate#1.0.0-alpha.2/dist/L.Deflate.js"></script>
</head>
<body>
<div id="map"></div>
</body>
</html>
why does the cluster coverage on hover not show?
coverage is not shown if there are only 2 objects... :|
adding a third object, e.g.:
var polyline2 = L.polyline([
[51.535, -0.1],
[51.525, -0.05],
], {
color: 'green'
});
deflate_features.addLayer(polyline2);
enables cluster coverage:
I am using leaflet for the first time as I am using open street map in place for Google.
In google autocomplete we use to get address's Suburb via
var place = autocomplete.getPlace();
Can anyone help me in leafletJs to get address details.
Thanks Much in advance.
For autocomplete address in leaflet JS you can use its plugin. Here Code uses the ESRI geoserach plugin.
you can refer this link for more detail.
DEMO
var map = L.map('map').setView([40.91, -96.63], 4);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
var searchControl = L.esri.Geocoding.geosearch().addTo(map);
var results = L.layerGroup().addTo(map);
searchControl.on('results', function(data) {
results.clearLayers();
for (var i = data.results.length - 1; i >= 0; i--) {
results.addLayer(L.marker(data.results[i].latlng));
}
});
body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
top: 0;
bottom: 0;
right: 0;
left: 0;
}
<!-- Load Leaflet from CDN -->
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.3.1/dist/leaflet.css" integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ==" crossorigin="" />
<script src="https://unpkg.com/leaflet#1.3.1/dist/leaflet.js" integrity="sha512-/Nsx9X4HebavoBvEBuyp3I7od5tA0UzAxs+j83KgC8PU0kgB4XiK4Lfe4y4cgBtaRJQEIFCW+oC506aPT2L1zw==" crossorigin=""></script>
<!-- Load Esri Leaflet from CDN -->
<script src="https://unpkg.com/esri-leaflet#2.1.4/dist/esri-leaflet.js" integrity="sha512-m+BZ3OSlzGdYLqUBZt3u6eA0sH+Txdmq7cqA1u8/B2aTXviGMMLOfrKyiIW7181jbzZAY0u+3jWoiL61iLcTKQ==" crossorigin=""></script>
<!-- Load Esri Leaflet Geocoder from CDN -->
<link rel="stylesheet" href="https://unpkg.com/esri-leaflet-geocoder#2.2.9/dist/esri-leaflet-geocoder.css" integrity="sha512-v5YmWLm8KqAAmg5808pETiccEohtt8rPVMGQ1jA6jqkWVydV5Cuz3nJ9fQ7ittSxvuqsvI9RSGfVoKPaAJZ/AQ==" crossorigin="">
<script src="https://unpkg.com/esri-leaflet-geocoder#2.2.9/dist/esri-leaflet-geocoder.js" integrity="sha512-QXchymy6PyEfYFQeOUuoz5pH5q9ng0eewZN8Sv0wvxq3ZhujTGF4eS/ySpnl6YfTQRWmA2Nn3Bezi9xuF8yNiw==" crossorigin=""></script>
<div id="map"></div>
Using the geocoding control to search for addresses and center the map.
var map = L.map('map').setView([-28.4792625, 24.6727135], 4);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '© OpenStreetMap contributors'
}).addTo(map);
var searchControl = L.esri.Geocoding.geosearch().addTo(map);
var results = L.layerGroup().addTo(map);
searchControl.on('results', function (data) {
results.clearLayers();
for (var i = data.results.length - 1; i >= 0; i--) {
results.addLayer(L.marker(data.results[i].latlng));
}
});
body { margin:0; padding:0; }
#map { position: absolute; top:0; bottom:0; right:0; left:0; }
<html>
<head>
<meta charset="utf-8" />
<title>Geocoding Control</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<!-- Load Leaflet from CDN -->
<link rel="stylesheet" href="https://unpkg.com/leaflet#1.6.0/dist/leaflet.css"
integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ=="
crossorigin=""/>
<script src="https://unpkg.com/leaflet#1.6.0/dist/leaflet.js"
integrity="sha512-gZwIG9x3wUXg2hdXF6+rVkLF/0Vi9U8D2Ntg4Ga5I5BZpVkVxlJWbSQtXPSiUTtC0TjtGOmxa1AJPuV0CPthew=="
crossorigin=""></script>
<!-- Load Esri Leaflet from CDN -->
<script src="https://unpkg.com/esri-leaflet#2.4.1/dist/esri-leaflet.js"
integrity="sha512-xY2smLIHKirD03vHKDJ2u4pqeHA7OQZZ27EjtqmuhDguxiUvdsOuXMwkg16PQrm9cgTmXtoxA6kwr8KBy3cdcw=="
crossorigin=""></script>
<!-- Load Esri Leaflet Geocoder from CDN -->
<link rel="stylesheet" href="https://unpkg.com/esri-leaflet-geocoder#2.3.3/dist/esri-leaflet-geocoder.css"
integrity="sha512-IM3Hs+feyi40yZhDH6kV8vQMg4Fh20s9OzInIIAc4nx7aMYMfo+IenRUekoYsHZqGkREUgx0VvlEsgm7nCDW9g=="
crossorigin="">
<script src="https://unpkg.com/esri-leaflet-geocoder#2.3.3/dist/esri-leaflet-geocoder.js"
integrity="sha512-HrFUyCEtIpxZloTgEKKMq4RFYhxjJkCiF5sDxuAokklOeZ68U2NPfh4MFtyIVWlsKtVbK5GD2/JzFyAfvT5ejA=="
crossorigin=""></script>
</head>
<body>
<div id="map"></div>
</body>
</html>
Source: http://esri.github.io/esri-leaflet/examples/geocoding-control.html