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inline.html
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<!DOCTYPE html>
<html>
<head>
<title>Removing Markers</title>
<script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
<script
src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
defer
></script>
<style type="text/css">
/* Always set the map height explicitly to define the size of the div
* element that contains the map. */
#map {
height: 100%;
}
/* Optional: Makes the sample page fill the window. */
html,
body {
height: 100%;
margin: 0;
padding: 0;
}
#floating-panel {
position: absolute;
top: 10px;
left: 25%;
z-index: 5;
background-color: #fff;
padding: 5px;
border: 1px solid #999;
text-align: center;
font-family: "Roboto", "sans-serif";
line-height: 30px;
padding-left: 10px;
}
</style>
<script>
// In the following example, markers appear when the user clicks on the map.
// The markers are stored in an array.
// The user can then click an option to hide, show or delete the markers.
let map;
let markers = [];
function initMap() {
const haightAshbury = { lat: 37.769, lng: -122.446 };
map = new google.maps.Map(document.getElementById("map"), {
zoom: 12,
center: haightAshbury,
mapTypeId: "terrain",
});
// This event listener will call addMarker() when the map is clicked.
map.addListener("click", (event) => {
addMarker(event.latLng);
});
// Adds a marker at the center of the map.
addMarker(haightAshbury);
}
// Adds a marker to the map and push to the array.
function addMarker(location) {
const marker = new google.maps.Marker({
position: location,
map: map,
});
markers.push(marker);
}
// Sets the map on all markers in the array.
function setMapOnAll(map) {
for (let i = 0; i < markers.length; i++) {
markers[i].setMap(map);
}
}
// Removes the markers from the map, but keeps them in the array.
function clearMarkers() {
setMapOnAll(null);
}
// Shows any markers currently in the array.
function showMarkers() {
setMapOnAll(map);
}
// Deletes all markers in the array by removing references to them.
function deleteMarkers() {
clearMarkers();
markers = [];
}
</script>
</head>
<body>
<div id="floating-panel">
<input onclick="clearMarkers();" type="button" value="Hide Markers" />
<input onclick="showMarkers();" type="button" value="Show All Markers" />
<input onclick="deleteMarkers();" type="button" value="Delete Markers" />
</div>
<div id="map"></div>
<p>Click on the map to add markers.</p>
</body>
</html>