Google Maps 事件
Google Maps JavaScript 程序可以响应用户生成的各种事件。本章提供的示例展示了如何在使用 Google 地图时执行事件处理。
添加事件监听器
您可以使用
addListener() 方法添加事件侦听器。它接受诸如我们要添加侦听器的对象名称、事件名称和处理程序事件等参数。
示例
以下示例展示了如何向标记对象添加事件侦听器。每次我们双击标记时，程序都会将地图的缩放值提高 5、
<!DOCTYPE html>
<html>
<head>
<script src = "https://maps.googleapis.com/maps/api/js"></script>
<script>
var myCenter = new google.maps.LatLng(17.433053, 78.412172);
function loadMap(){
var mapProp = {
center: myCenter,
zoom:5,
mapTypeId: google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
var marker = new google.maps.Marker({
position: myCenter,
title:'Click to zoom'
});
marker.setMap(map);
//Zoom to 7 when clicked on marker
google.maps.event.addListener(marker,'click',function() {
map.setZoom(9);
map.setCenter(marker.getPosition());
});
}
</script>
</head>
<body onload = "loadMap()">
<div id = "googleMap" style = "width:580px; height:400px;"></div>
</body>
</html>
点击打开信息窗口
以下代码在点击标记时打开一个信息窗口-
<!DOCTYPE html>
<html>
<head>
<script src = "https://maps.googleapis.com/maps/api/js"></script>
<script>
var myCenter = new google.maps.LatLng(17.433053, 78.412172);
function loadMap(){
var mapProp = {
center:myCenter,
zoom:4,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
var marker = new google.maps.Marker({
position:myCenter,
});
marker.setMap(map);
var infowindow = new google.maps.InfoWindow({
content:"Hi"
});
google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
}
</script>
</head>
<body onload = "loadMap()">
<div id = "googleMap" style = "width:580px; height:400px;"></div>
</body>
</html>
删除监听器
您可以使用方法
removeListener() 删除现有的侦听器。此方法接受侦听器对象，因此我们必须将侦听器分配给一个变量并将其传递给此方法。
示例
以下代码显示了如何删除侦听器-
<!DOCTYPE html>
<html>
<head>
<script src = "https://maps.googleapis.com/maps/api/js"></script>
<script>
var myCenter = new google.maps.LatLng(17.433053, 78.412172);
function loadMap(){
var mapProp = {
center:myCenter,
zoom:4,
mapTypeId:google.maps.MapTypeId.ROADMAP
};
var map = new google.maps.Map(document.getElementById("googleMap"),mapProp);
var marker = new google.maps.Marker({
position:myCenter,
});
marker.setMap(map);
var infowindow = new google.maps.InfoWindow({
content:"Hi"
});
var myListener = google.maps.event.addListener(marker, 'click', function() {
infowindow.open(map,marker);
});
google.maps.event.removeListener(myListener);
}
</script>
</head>
<body onload = "loadMap()">
<div id = "googleMap" style = "width:580px; height:400px;"></div>
</body>
</html>
