why my code can't alert the map's zoom when zoom changed using MVCObject on google-maps v3 _问答_开发者

why my code can't alert the map's zoom when zoom changed using MVCObject on google-maps v3

开发者 https://www.devze.com 2023-01-15 18:33 出处：网络

this is my code : <!DOCTYPE html> <html> <head> <开发者_开发问答meta name=\"viewport\" content=\"initial-scale=1.0, user-scalable=no\" />

this is my code :

<!DOCTYPE html>
<html>
<head>
<开发者_开发问答meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
  html { height: 100% }
  body { height: 100%; margin: 0px; padding: 0px }
  #map_canvas { height: 100% }
</style>
<script type="text/javascript"src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
  function initialize() {
    var latlng = new google.maps.LatLng(-34.397, 150.644);
    var myOptions = {
      zoom: 8,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);
    function A(){
        this.set('zoom',map.zoom);
        this.bindTo('zoom', map);
    }
    A.prototype = new google.maps.MVCObject();
    A.prototype.zoom_changed = function () {
        alert(map.zoom)
    }
    }
</script>
</head>
<body onload="initialize()">
  <div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>

i want to alert map.zoom when zoom changed using MVCObject ,

but not working . thanks

it is ok now :

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
  html { height: 100% }
  body { height: 100%; margin: 0px; padding: 0px }
  #map_canvas { height: 100% }
</style>
<script type="text/javascript"src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
  function initialize() {
    var latlng = new google.maps.LatLng(-34.397, 150.644);
    var myOptions = {
      zoom: 8,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);
    function A(){
        this.bindTo('zoom', map);
    }
    A.prototype = new google.maps.MVCObject();
    A.prototype.zoom_changed = function () {
        alert(this.get('zoom'))
    }
    var a=new A()
    }
</script>
</head>
<body onload="initialize()">
  <div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
  html { height: 100% }
  body { height: 100%; margin: 0px; padding: 0px }
  #map_canvas { height: 100% }
</style>
<script type="text/javascript"src="http://maps.google.com/maps/api/js?sensor=false"></script>
<script type="text/javascript">
  function initialize() {
    var latlng = new google.maps.LatLng(-34.397, 150.644);
    var myOptions = {
      zoom: 8,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);

    var marker = new google.maps.Marker({
                position: map.getCenter(),
                draggable:true,
                map: map});
    //map.bounds_=map.getBounds()
    //console.log(map.get('bounds'))
    function A(){
        this.bindTo('zoom', map);
        //this.set('marker', marker);
        marker.bindTo('position',map,'center')
        //this.bindTo('')
    }
    A.prototype = new google.maps.MVCObject();
    A.prototype.zoom_changed = function () {
        //if(this.get('marker'))
        //console.log(this.get('marker'))
        console.log(map.get('center'))
    }
    google.maps.Marker.prototype.position_changed = function () {
        console.log('sss')
    }
    var a=new A()
    }
</script>
</head>
<body onload="initialize()">
  <div id="map_canvas" style="width:100%; height:100%"></div>
</body>
</html>

Try this: