Google Maps v3：需要多个可拖动标记才能更新HTML输入字段

时间：2011-06-28 17:42:09

标签： javascript google-maps google-maps-api-3 google-maps-markers

我正在开发一个使用谷歌地图v3的项目，该项目允许用户拖放随机放置的标记（数量，坐标和用PHP生成的标签）。

我想移动标记的纬度和经度来更新页面上的html输入字段。 不幸的是，我不太了解js通过使用数组和/或“变量变量”以有效的方式为每个标记赋予唯一标识。

到目前为止，这是我的代码：

<!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=true"></script>
<script type="text/javascript">
function initialize() 
{
    var latlng = new google.maps.LatLng(39.3939,-119.861);
    var myOptions = 
    {
      zoom: 17,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.SATELLITE
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);

    // Set Border Coords
    var BorderCoords = 
    [
        new google.maps.LatLng(39.3952726888,-119.85922848),
        new google.maps.LatLng(39.3925273112,-119.85922848),
        new google.maps.LatLng(39.3925273112,-119.86277152),
        new google.maps.LatLng(39.3952726888,-119.86277152)   
    ];      

    // Define Border
    Border = new google.maps.Polygon
    ({
        map: map,
        paths: BorderCoords,
        strokeColor: "#FF0000",
        strokeOpacity: 0.8,
        strokeWeight: 2
    });

    // Set marker coords
    var MarkerCoords =
    [
        [39.3930761,-119.8612324],
        [39.3947606,-119.8617452],
        [39.3948516,-119.8619689],
        [39.3929412,-119.859542],
        [39.3947902,-119.8601571],
        [39.3940501,-119.8593369]
    ];

    // Set marker properties
    var MarkerProp = 
    [
        ["Red","A"],
        ["Red","B"],
        ["Red","C"],
        ["Blue","A"],
        ["Blue","B"],
        ["Blue","C"]
    ];

    // Define marker coords
    for (var i = 0; i < MarkerCoords.length; i++)
    {
        var markers = new google.maps.Marker
        ({
            map: map,
            position: new google.maps.LatLng(MarkerCoords[i][0],MarkerCoords[i][1]),
            clickable: true,
            draggable: true,
            icon: 'img/icons/'+MarkerProp[i][0]+'/letter_'+MarkerProp[i][1]+'.png'
        });

        google.maps.event.addListener(markers, "dragend", function() 
        {
            //These variables will not work
            //var latstr = eval('lat_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
            //var lngstr = eval('lng_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
            //var lat = document.getElementById(latstr);
            //var lng = document.getElementById(lngstr);

            //these lat/lng variables work for only one set of input fields
            var lat = document.getElementById('lat_Blue_C');
            var lng = document.getElementById('lng_Blue_C');
            var coords = this.getPosition()
            lat.value = coords.lat();
            lng.value = coords.lng();
        });
    }
}
</script>

</head>
<body onload="initialize()">
<div id="map_canvas" style="width:700px; height:400px"></div>
<br/>
<input id="lat_Red_A" type="text">
<input id="lng_Red_A" type="text">
<br/>
<input id="lat_Red_B" type="text">
<input id="lng_Red_B" type="text">
<br/>
<input id="lat_Red_C" type="text">
<input id="lng_Red_C" type="text">
<br/>
<input id="lat_Blue_A" type="text">
<input id="lng_Blue_A" type="text">
<br/>
<input id="lat_Blue_B" type="text">
<input id="lng_Blue_B" type="text">
<br/>
<input id="lat_Blue_C" type="text">
<input id="lng_Blue_C" type="text">
<br/>
</body>

</html>

2 个答案:

答案 0 :(得分：3)

关于JavaScript的一个美妙的事情是你可以动态分配对象字段。你能做的一件事就是给每个标记一个名字或一个id。要做到这一点，你只需说：

marker.id = whatever;

然后你可以通过调用marker.id;

获得与任何属性相同的值

这可能是给他们唯一ID的最有效方式。在dragend的eventhandler中你可以做，然后if-then-else检查它是哪个标记并更新相关的输入字段。

答案 1 :(得分：3)

这是答案。根据您的标记属性定义自定义ID，并根据该访问输入字段ID：

<!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=true"></script>
<script type="text/javascript">
function initialize() 
{
    var latlng = new google.maps.LatLng(39.3939,-119.861);
    var myOptions = 
    {
      zoom: 17,
      center: latlng,
      mapTypeId: google.maps.MapTypeId.SATELLITE
    };
    var map = new google.maps.Map(document.getElementById("map_canvas"),
        myOptions);

    // Set Border Coords
    var BorderCoords = 
    [
        new google.maps.LatLng(39.3952726888,-119.85922848),
        new google.maps.LatLng(39.3925273112,-119.85922848),
        new google.maps.LatLng(39.3925273112,-119.86277152),
        new google.maps.LatLng(39.3952726888,-119.86277152)   
    ];      

    // Define Border
    Border = new google.maps.Polygon
    ({
        map: map,
        paths: BorderCoords,
        strokeColor: "#FF0000",
        strokeOpacity: 0.8,
        strokeWeight: 2
    });

    // Set marker coords
    var MarkerCoords =
    [
        [39.3930761,-119.8612324],
        [39.3947606,-119.8617452],
        [39.3948516,-119.8619689],
        [39.3929412,-119.859542],
        [39.3947902,-119.8601571],
        [39.3940501,-119.8593369]
    ];

    // Set marker properties
    var MarkerProp = 
    [
        ["Red","A",],
        ["Red","B"],
        ["Red","C"],
        ["Blue","A"],
        ["Blue","B"],
        ["Blue","C"]
    ];

    // Define marker coords
    for (var i = 0; i < MarkerCoords.length; i++)
    {
        var markers = new google.maps.Marker
        ({
            map: map,
            position: new google.maps.LatLng(MarkerCoords[i][0],MarkerCoords[i][1]),
            clickable: true,
            draggable: true,

            //define a custom id based on marker properties

            my_id: MarkerProp[i][0] +"_"+MarkerProp[i][1],
            icon: 'img/icons/'+MarkerProp[i][0]+'/letter_'+MarkerProp[i][1]+'.png'
        });

        google.maps.event.addListener(markers, "dragend", function() 
        {
            //These variables will not work
            //var latstr = eval('lat_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
            //var lngstr = eval('lng_'+MarkerProp[i][0]+'_'+MarkerProp[i][1]);
            //var lat = document.getElementById(latstr);
            //var lng = document.getElementById(lngstr);

//get the id of the marker
var marker_id = this.my_id;



            //match the fields to update
            var lat = document.getElementById('lat_' + marker_id);
            var lng = document.getElementById('lng_' + marker_id);
            var coords = this.getPosition()
            lat.value = coords.lat();
            lng.value = coords.lng();
        });
    }
}
</script>

</head>
<body onload="initialize()">
<div id="map_canvas" style="width:700px; height:400px"></div>
<br/>
<input id="lat_Red_A" type="text">
<input id="lng_Red_A" type="text">
<br/>
<input id="lat_Red_B" type="text">
<input id="lng_Red_B" type="text">
<br/>
<input id="lat_Red_C" type="text">
<input id="lng_Red_C" type="text">
<br/>
<input id="lat_Blue_A" type="text">
<input id="lng_Blue_A" type="text">
<br/>
<input id="lat_Blue_B" type="text">
<input id="lng_Blue_B" type="text">
<br/>
<input id="lat_Blue_C" type="text">
<input id="lng_Blue_C" type="text">
<br/>
</body>

</html>
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