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pablinhob/Leaflet with input text

Created January 10, 2019 07:19
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Leaflet with input text
<!DOCTYPE html>
<html>
<head>
<title>Map populating form fields</title>
<meta charset="utf-8" />
<link rel="stylesheet" href="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css" /> <!-- original: http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.css -->
<style>
html, body, #container, #map {
padding: 0;
margin: 0;
}
html, body, #map, #container {
height: 460px;
width:460px;
}
</style>
</head>
<body>
<form>
<label for="latitude">Latitude:</label>
<input id="latitude" type="text" />
<label for="longitude">Longitude:</label>
<input id="longitude" type="text" />
:: or, enter your own lat-long values and <input type="button" value="Jump there" onClick="updateLatLng(document.getElementById('latitude').value,document.getElementById('longitude').value,1)">
:: <a href="#" onclick="map.zoomOut(3, {animate:true})">zoom out</a> ::
:: <a href="#" onclick="map.zoomIn(3, {animate:true})">zoom in</a>
</form>
<div id="map"></div>
<script src="http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js"></script> <!-- Orginal: http://cdn.leafletjs.com/leaflet-0.7.3/leaflet.js -->
<script>
var tileLayer = new L.TileLayer('http://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: '&copy; <a href="http://www.openstreetmap.org/copyright">OpenStreetMap</a> Contributors'
});
//remember last position
var rememberLat = document.getElementById('latitude').value;
var rememberLong = document.getElementById('longitude').value;
if( !rememberLat || !rememberLong ) { rememberLat = 40; rememberLong = 0;}
var map = new L.Map('map', {
'center': [rememberLat, rememberLong],
'zoom': 2,
'layers': [tileLayer]
});
var marker = false;
function addMarker(){
marker = L.marker([0,0],{
draggable: true
}).addTo(map);
marker.on('dragend', function (e) {
updateLatLng(marker.getLatLng().lat, marker.getLatLng().lng);
});
}
map.on('click', function (e) {
if(marker == false) {
addMarker();
}
marker.setLatLng(e.latlng);
updateLatLng(marker.getLatLng().lat, marker.getLatLng().lng);
});
function updateLatLng(lat,lng,reverse) {
if(reverse) {
marker.setLatLng([lat,lng]);
map.panTo([lat,lng]);
} else {
document.getElementById('latitude').value = marker.getLatLng().lat;
document.getElementById('longitude').value = marker.getLatLng().lng;
map.panTo([lat,lng]);
}
}
</script>
</body>
</html>
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