Geographic Information Systems Asked by Niall on February 14, 2021
I am new to Leaflet, HTML, CSS and Java. I am using leaflets maps and I want to create a sidebar that is active when a marker is clicked or active when a clicked in the sidebar, so far I have had no luck at all. I have tried to do similar to this but I want defined markers lat and long http://jsfiddle.net/BPuQ9/8/ but have had no luck
I have a JSfiddle file here: https://jsfiddle.net/Niall2110/yphxqzu2/1/
<!DOCTYPE html>
<html>
<head>
<title>Quick Start - Leaflet</title>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="shortcut icon" type="image/x-icon" href="docs/images/favicon.ico" />
<link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/leaflet.css" integrity="sha512-xwE/Az9zrjBIphAcBb3F6JVqxf46+CDLwfLMHloNu6KEQCAWi6HcDUbeOfBIptF7tcCzusKFjFw2yuvEpDL9wQ==" crossorigin=""/>
<script src="https://unpkg.com/[email protected]/dist/leaflet.js" integrity="sha512-GffPMF3RvMeYyc1LWMHtK8EbPv0iNZ8/oTtHPx9/cc2ILxQ+u905qIwdpULaqDkyBKgOaB57QTMg7ztg8Jm2Og==" crossorigin=""></script>
<style>
html, body, #map {
width:100%;
height:100%;
margin:0;
margin-left:10%;
padding:0;
}
#overlay {
position:absolute;
width:30%;
height:100%;
left:0;
top:0;
background-color:rgba(255, 255, 255, 0.8);
}
</style>
</head>
<body>
<div id = "map"></div>
<div id="overlay"></div>
<script>
var map = L.map('map', {
center: [48,14],
zoom: 7,
animate: true, duration: 1
});
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
attribution: 'Map data © <a
href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
'<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
id: 'mapbox.streets'
}).addTo(map);
L.marker([49, 14]).addTo(map)
.bindPopup("<b><font size='6'>Headline</font></b><br />info<br //> <img src=''> <a href= '' target='_blank'><button>Source</button></a> ").openPopup();
$('#overlay').append(
'<div class="item" id="' + marker._leaflet_id + '">marker ' + marker._leaflet_id + ' - <a href="#" class="remove" id="' + marker._leaflet_id + '">remove</a></div>');
</script>
</body>
</html>
I think what you're after is this plugin: leaflet sidebar. There's also version 2, which is more interactive. I recommend playing with these sidebars. The github repositories have great instructions on how to get them up and running on your page, even as a newbie. For example, using sidebar, once you've added the sidebar, you can set the content of the sidebar using an eventlistener on your marker:
let marker = L.marker( [lat,lng] , {options} ).addTo(map)
marker.addEventListener("click", function(){
sidebar.setContent('Whatever content you want displayed here');
}, false)
If you want content in your sidebar to link back to your map, you can set the text of your sidebar content as a variable with your HTML content:
let sidebarContent = "<p>This marker that you've clicked is at x and y
location, has historical significance X, and is sister cities with
<a id="sisterCity">this city</a>.</p>"
Then you can grab your link that you've IDed, and put a function on it that does something with your map:
let sisterCityLink = document.querySelector('#sisterCity');
sisterCity.addEventListener('click', function(){
map.setView( [sisterCityLat, sisteCityLng] )
// map.setZoom....
// sidebar.SetContent(sisterCityConent)....
// etc....
}, false)
Answered by Seth Lutske on February 14, 2021
Solution below is not complete solution with all the required bells and whistles (specially CSS styles are lame), it's just a first step in the right direction.
There is simple function createMarker for creating markers with all the desired properties (position, title, text, image, source link). Function creates marker in markerLayer with the following properties:
Remove element which upon click removes the whole element from the sidebar.Working JSFiddle is available at https://jsfiddle.net/TomazicM/ox43cbth/5/
The code:
<!DOCTYPE html>
<html>
<head>
<title>Quick Start - Leaflet</title>
<meta charset="utf-8" />
<meta content="width=device-width, initial-scale=1.0" name="viewport">
<link crossorigin="" href="lib/leaflet/leaflet.css"rel="stylesheet" />
<script src="lib/leaflet/leaflet.js"></script>
<script src="lib/Leaflet.SmoothMarkerBouncing/leaflet.smoothmarkerbouncing.js"></script>
<style>
html, body, #map {
width: 100%;
height: 100%;
margin: 0;
margin-left: 10%;
padding:0;
}
#sidebar {
position: absolute;
width: 30%;
height: 100%;
left: 0;
top: 0;
background-color: rgba(255, 255, 255, 0.8);
}
.sidebarElement {
padding: 6px;
display: table;
width: 95%;
}
.infoSidebarElement {
display: table-cell;
cursor: pointer;
width: 90%;
}
.removeSidebarElement {
display: table-cell;
text-align: right;
cursor: pointer;
} //closing bracket was missing (had to add some more letters, otherwise unable to submit)
</style>
</head>
<body>
<div id="sidebar"></div>
<div id="map"></div>
<script>
var map = L.map('map', {
center: [48,14],
zoom: 7,
animate: true, duration: 1
});
L.tileLayer('https://api.tiles.mapbox.com/v4/{id}/{z}/{x}/{y}.png?access_token=pk.eyJ1IjoibWFwYm94IiwiYSI6ImNpejY4NXVycTA2emYycXBndHRqcmZ3N3gifQ.rJcFIG214AriISLbB6B5aw', {
maxZoom: 18,
attribution: 'Map data © <a href="https://www.openstreetmap.org/">OpenStreetMap</a> contributors, ' +
'<a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>, ' +
'Imagery © <a href="https://www.mapbox.com/">Mapbox</a>',
id: 'mapbox.streets'
}).addTo(map);
markerLayer = L.layerGroup([]).addTo(map);
function createMarker(coords, title, info, image, source) {
var marker, content;
content = '<b><font size="6">' + title + '</font></b><br/>' + info + '<br> <img src="' + image + '"><a href="' + source + '" target="_blank"><button>Source</button></a>'
marker = L.marker(coords).addTo(markerLayer);
marker.bindPopup(content);
marker.on('click', function(evt) {
var id = L.Util.stamp(evt.target);
if (document.getElementById(id) != null) return;
var sidebarElement, infoPart, removePart;
sidebarElement = L.DomUtil.create('div', 'sidebarElement', document.getElementById('sidebar'));
sidebarElement.id = id;
infoPart = L.DomUtil.create('div', 'infoSidebarElement', sidebarElement);
infoPart.innerHTML = content;
L.DomEvent.on(infoPart, 'click', function(evt) {
var marker = markerLayer.getLayer(this.id);
marker.closePopup();
map.panTo(marker.getLatLng());
marker.bounce(3);
}, sidebarElement);
removePart = L.DomUtil.create('div', 'removeSidebarElement', sidebarElement);
removePart.innerHTML = 'Remove';
L.DomEvent.on(removePart, 'click', function(evt) {
markerLayer.getLayer(this.id).closePopup();
this.parentNode.removeChild(this);
}, sidebarElement);
});
}
createMarker([49, 14], 'Title 1', 'Info 1', '', '');
createMarker([47, 12], 'Title 2', 'Info 2', '', '');
</script>
</body>
</html>
Answered by TomazicM on February 14, 2021
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