---
title: "Show polygon information on click | JavaScript maps SDK"
description: "Display a popup when a user clicks a polygon."
---
> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.
# Show polygon information on click
When a user clicks on a polygon, a [`Popup`](https://docs.maptiler.com/sdk-js/api/markers/#popup) will appear displaying additional details. This feature allows you to show the attributes of the selected element.
### NPM module setup
```bash
npm install --save @maptiler/sdk
```
#### main.js
```js
import { Map, MapStyle, config, Popup } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';
config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
container: 'map',
style: MapStyle.STREETS,
center: [-100.04, 38.907],
zoom: 3
});
map.on('load', function () {
// Add a source for the state polygons.
map.addSource('states', {
'type': 'geojson',
'data':
'https://d2ad6b4ur7yvpq.cloudfront.net/naturalearth-3.3.0/ne_110m_admin_1_states_provinces_shp.geojson'
});
// Add a layer showing the state polygons.
map.addLayer({
'id': 'states-layer',
'type': 'fill',
'source': 'states',
'paint': {
'fill-color': 'rgba(200, 100, 240, 0.4)',
'fill-outline-color': 'rgba(200, 100, 240, 1)'
}
});
// When a click event occurs on a feature in the states layer, open a popup at the
// location of the click, with description HTML from its properties.
map.on('click', 'states-layer', function (e) {
new Popup()
.setLngLat(e.lngLat)
.setHTML(e.features[0].properties.name)
.addTo(map);
});
// Change the cursor to a pointer when the mouse is over the states layer.
map.on('mouseenter', 'states-layer', function () {
map.getCanvas().style.cursor = 'pointer';
});
// Change it back to a pointer when it leaves.
map.on('mouseleave', 'states-layer', function () {
map.getCanvas().style.cursor = '';
});
});
```
#### index.html
```html
Show polygon information on click
```
#### style.css
```css
body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}
.maplibregl-popup {
max-width: 400px;
font: 12px/20px 'Helvetica Neue', Arial, Helvetica, sans-serif;
}
```
### Basic JavaScript setup
```html
Show polygon information on click
```
## Related examples
### [Display a popup on hover](https://docs.maptiler.com/sdk-js/examples/popup-on-hover/)
Examples
Show a popup when hovering over a custom marker.
### [Display a popup on click](https://docs.maptiler.com/sdk-js/examples/popup-on-click/)
Examples
Display a popup when a user clicks a symbol.
### [Weather custom popup](https://docs.maptiler.com/sdk-js/examples/weather-custom-popup/)
Examples
Create highly customizable popups for weather maps using MarkerLayout.
### [Display a popup](https://docs.maptiler.com/sdk-js/examples/popup/)
Examples
Add an information popup to the map.