Google 地图事件实例讲解

时间:2020-05-15 人气:0

Google 地图事件

点击标记缩放地图

我们仍然使用上一遍文章使用的英国伦敦的地图。

点用户点击标记时实现缩放地图的功能(点击标记时绑定地图缩放事件)。

代码如下：

<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false">
</script>

<script>
var myCenter=new google.maps.LatLng(51.508742,-0.120850);

function initialize()
{
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 9 when clicking on marker
google.maps.event.addListener(marker,'click',function() {
 map.setZoom(9);
 map.setCenter(marker.getPosition());
 });
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>

</body>
</html>

使用 addListener() 事件处理程序来注册事件的监听。该方法使用一个对象，一个事件来监听，当指定的事件发生时函数将被调用。

重置标记

我们通过给地图添加事件处理程序来改变 'center' 属性，以下代码使用 center_changed 事件在3秒后标记移会中心点:

实例

<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false">
</script>

<script>
var myCenter=new google.maps.LatLng(51.508742,-0.120850);

function initialize()
{
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 9 when clicking on marker
google.maps.event.addListener(marker,'click',function() {
 map.setZoom(9);
 map.setCenter(marker.getPosition());
 });
   
google.maps.event.addListener(map,'center_changed',function() {
// 3 seconds after the center of the map has changed, pan back to the marker
 window.setTimeout(function() {
  map.panTo(marker.getPosition());
 },3000);
 });
}
google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>

</body>
</html>

点击标记时打开信息窗口。

点击标记在信息窗口显示一些文本信息：

实例

<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false">
</script>

<script>
var myCenter=new google.maps.LatLng(51.508742,-0.120850);

function initialize()
{
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,
 });

marker.setMap(map);

var infowindow = new google.maps.InfoWindow({
 content:"Hello World!"
 });

google.maps.event.addListener(marker, 'click', function() {
 infowindow.open(map,marker);
 });
}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>
</body>
</html>

设置标记及打开每个标记的信息窗口

当用户点击地图时执行一个窗口

用户点击地图某个位置时使用 placeMarker() 函数在指定位置上放置一个标记，并弹出信息窗口：

实例

<html>
<head>
<script
src="http://maps.googleapis.com/maps/api/js?key=AIzaSyDY0kkJiTPVd2U7aTOAwhc9ySH6oHxOIYM&sensor=false">
</script>

<script>
var map;
var myCenter=new google.maps.LatLng(51.508742,-0.120850);

function initialize()
{
var mapProp = {
 center:myCenter,
 zoom:5,
 mapTypeId:google.maps.MapTypeId.ROADMAP
 };

 map = new google.maps.Map(document.getElementById("googleMap"),mapProp);

 google.maps.event.addListener(map, 'click', function(event) {
  placeMarker(event.latLng);
 });
}

function placeMarker(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);
}

google.maps.event.addDomListener(window, 'load', initialize);
</script>
</head>

<body>
<div id="googleMap" style="width:500px;height:380px;"></div>

</body>
</html>

以上就是对Google 地图事件的基础知识整理，后续继续补充相关知识，谢谢大家对本站的支持！

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