The Mappedin Web SDK allows you to add Markers to the map. These are elements containing arbitrary HTML that the SDK will anchor to a node or polygon on the map, and automatically handle rotation and repositioning when the camera moves. In the following example, we will create an experience that allows a user to click on a location on the map to view its name and logo.

Add some CSS for the markers in a style.css file and import it in your HTML or Javascript.

.marker {
display: flex;
align-items: center;
background-color: #fff;
max-height: 64px;
border: 2px solid grey;
padding: 4px 12px;
font-weight: bold;
font-family: sans-serif;
.marker img {
max-width: 64px;
max-height: 32px;
object-fit: contain;
margin-right: 12px;

Add the following to your script file:

mapView.on(E_SDK_EVENT.POLYGON_CLICKED, (polygon) => {
const location = mapView.getPrimaryLocationForPolygon(polygon);
if (!location) return;
const { name, logo } = location;
const markerTemplate = `
<div class="marker">
<img src="${logo?.original}" />
mapView.createMarker(polygon.entrances[0], markerTemplate);

To remove markers call removeAllMarkers() when the user clicks outside of interactive polygons:

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