This example shows controlling marker visibility by zoom level. See the markers'
visibility change (begin by zooming out):

Read the
[documentation](https://developers.google.com/maps/documentation/javascript/advanced-markers/collision-behavior.md.txt#control_marker_visibility_by_map_zoom_level).
<iframe src="https://maps-docs-team.web.app/samples/advanced-markers-zoom/dist/" allow="fullscreen; "></iframe>

### TypeScript

```typescript
const mapElement = document.querySelector('gmp-map')!;

async function init() {
    // Request needed libraries.
    const [{ AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('marker'),
        google.maps.importLibrary('maps'),
    ]);

    const markerOptions = [
        {
            position: { lat: 37.4239163, lng: -122.094 },
            title: 'This marker is visible at zoom level 15 and higher.',
            minZoom: 14,
        },
        {
            position: { lat: 37.4245, lng: -122.096 },
            title: 'This marker is visible at zoom level 16 and higher.',
            minZoom: 15,
        },
        {
            position: { lat: 37.4249, lng: -122.095 },
            title: 'This marker is visible at zoom level 17 and higher.',
            minZoom: 16,
        },
        {
            position: { lat: 37.425, lng: -122.0955 },
            title: 'This marker is visible at zoom level 18 and higher.',
            minZoom: 17,
        },
    ];

    const markers: google.maps.marker.AdvancedMarkerElement[] = [];
    for (const { position, title } of markerOptions) {
        const marker = new AdvancedMarkerElement({ position, title });
        mapElement.append(marker);
        markers.push(marker);
    }

    mapElement.innerMap.addListener('zoom_changed', () => {
        const zoom = mapElement.innerMap.getZoom();
        for (let i = 0; i < markers.length; i++) {
            const { position, minZoom } = markerOptions[i];
            markers[i].position = zoom! > minZoom ? position : null;
        }
    });
}

void init();
```

### JavaScript

```javascript
const mapElement = document.querySelector('gmp-map');

async function init() {
    // Request needed libraries.
    const [{ AdvancedMarkerElement }] = await Promise.all([
        google.maps.importLibrary('marker'),
        google.maps.importLibrary('maps'),
    ]);

    const markerOptions = [
        {
            position: { lat: 37.4239163, lng: -122.094 },
            title: 'This marker is visible at zoom level 15 and higher.',
            minZoom: 14,
        },
        {
            position: { lat: 37.4245, lng: -122.096 },
            title: 'This marker is visible at zoom level 16 and higher.',
            minZoom: 15,
        },
        {
            position: { lat: 37.4249, lng: -122.095 },
            title: 'This marker is visible at zoom level 17 and higher.',
            minZoom: 16,
        },
        {
            position: { lat: 37.425, lng: -122.0955 },
            title: 'This marker is visible at zoom level 18 and higher.',
            minZoom: 17,
        },
    ];

    const markers = [];
    for (const { position, title } of markerOptions) {
        const marker = new AdvancedMarkerElement({ position, title });
        mapElement.append(marker);
        markers.push(marker);
    }

    mapElement.innerMap.addListener('zoom_changed', () => {
        const zoom = mapElement.innerMap.getZoom();
        for (let i = 0; i < markers.length; i++) {
            const { position, minZoom } = markerOptions[i];
            markers[i].position = zoom > minZoom ? position : null;
        }
    });
}

void init();
```

### CSS

```css
/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
gmp-map {
    height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
    height: 100%;
    margin: 0;
    padding: 0;
}
```

### HTML

```html
<html>
    <head>
        <title>Advanced Marker Zoom Visibility</title>

        <link rel="stylesheet" type="text/css" href="./style.css" />
        <script type="module" src="./index.js"></script>
        <script>
            // prettier-ignore
            (g=>{var h,a,k,p="The Google Maps JavaScript API",c="google",l="importLibrary",q="__ib__",m=document,b=window;b=b[c]||(b[c]={});var d=b.maps||(b.maps={}),r=new Set,e=new URLSearchParams,u=()=>h||(h=new Promise(async(f,n)=>{await (a=m.createElement("script"));e.set("libraries",[...r]+"");for(k in g)e.set(k.replace(/[A-Z]/g,t=>"_"+t[0].toLowerCase()),g[k]);e.set("callback",c+".maps."+q);a.src=`https://maps.${c}apis.com/maps/api/js?`+e;d[q]=f;a.onerror=()=>h=n(Error(p+" could not load."));a.nonce=m.querySelector("script[nonce]")?.nonce||"";m.head.append(a)}));d[l]?console.warn(p+" only loads once. Ignoring:",g):d[l]=(f,...n)=>r.add(f)&&u().then(()=>d[l](f,...n))})({
                key: "GOOGLE_MAPS_API_KEY"
            });
        </script>
    </head>
    <body>
        <gmp-map
            center="37.424563902650114,-122.09512859577026"
            zoom="18"
            map-id="4504f8b37365c3d0"></gmp-map>
    </body>
</html>
```

### Try Sample

[JSFiddle.net](https://jsfiddle.net/gh/get/library/pure/googlemaps-samples/js-api-samples/tree/main/dist/samples/advanced-markers-zoom/jsfiddle)

### Clone Sample


Git and Node.js are required to run this sample locally. Follow these [instructions](https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)
to install Node.js and NPM. You will also need a [Google Maps API key](https://developers.google.com/maps/documentation/javascript/get-api-key.md.txt).


The following commands clone the repository, install dependencies, and copy the environment file.

```javascript
  git clone https://github.com/googlemaps-samples/js-api-samples.git
  cd js-api-samples
  npm i
  cp .env.template .env
```


Once you copy the environment file, make sure to open the `.env` file and replace `<Insert your own development API key here>` with your actual API key before starting the sample.

```javascript
  cd samples/advanced-markers-zoom
  npm start
```