Google Maps Events
Click The Marker to Zoom
We still use the map from the previous page: a map centered on London, England.
Now we want to zoom when a user is clicking on the marker (We attach an event handler to a marker that zooms the map when clicked).
Here is the added code:
Example
// Zoom to 9 when clicking on marker
google.maps.event.addListener(marker,'click',function() {
map.setZoom(9);
map.setCenter(marker.getPosition());
});
We register for event notifications using the addListener() event handler. That method takes an object, an event to listen for, and a function to call when the specified event occurs.
Pan Back to Marker
Here, we save the zoom changes and pan the map back after 3 seconds:
Example
google.maps.event.addListener(marker,'click',function() {
var pos = map.getZoom();
map.setZoom(9);
map.setCenter(marker.getPosition());
window.setTimeout(function() {map.setZoom(pos);},3000);
});
Open an InfoWindow When Clicking on The Marker
Click on the marker to show an infowindow with some text:
Example
var infowindow = new google.maps.InfoWindow({
content:"Hello World!"
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
Set Markers and Open InfoWindow for Each Marker
Run a function when the user clicks on the map.
The placeMarker() function places a marker where the user has clicked, and shows an infowindow with the latitudes and longitudes of the marker:
Example
google.maps.event.addListener(map, 'click', function(event) {
placeMarker(map, event.latLng);
});
function placeMarker(map, location) {
var marker = new google.maps.Marker({
position: location,
map: map
});
var infowindow = new google.maps.InfoWindow({
content: 'Latitude: ' + location.lat() +
'<br>Longitude: ' + location.lng()
});
infowindow.open(map,marker);
}
