javascript - 单击时提取 drawingManager 多边形路径 Google map

Question

我有一个启用了绘图管理器的 Google map ，用户可以在其中绘制多边形并将其保存到我的数据库中。我为 overlaycomplete 事件向 drawingManager 对象添加了一个事件监听器。当事件被触发时，多边形的坐标被写入一个隐藏字段。这很好用 - 唯一的问题是，如果在该点之后拖动/更改单个顶点，则不会触发事件。当用户点击提交并将它们写入隐藏字段时，我需要在(任何)更改时更新字段或遍历多边形顶点。我不太明白如何让它工作，但你可以在这里看到我目前所拥有的:http://jsfiddle.net/5Y4WT/21/

HTML:

<div id="map_canvas" style="width:500px; height:450px;"></div>
<form method="post" accept-charset="utf-8" id="map_form">
  <input type="text" name="vertices" value="" id="vertices"  />
  <input type="button" name="save" value="Save!" id="save"  />
</form>

JavaScript:

var map; // Global declaration of the map
var iw = new google.maps.InfoWindow(); // Global declaration of the infowindow
var lat_longs = new Array();
var markers = new Array();
var drawingManager;
function initialize() {
    var myLatlng = new google.maps.LatLng(40.9403762, -74.1318096);
    var myOptions = {
        zoom: 13,
        center: myLatlng,
        mapTypeId: google.maps.MapTypeId.ROADMAP}
    map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);
    drawingManager = new google.maps.drawing.DrawingManager({
    drawingMode: google.maps.drawing.OverlayType.POLYGON,
    drawingControl: true,
    drawingControlOptions: {
                position: google.maps.ControlPosition.TOP_CENTER,
                drawingModes: [google.maps.drawing.OverlayType.POLYGON]
                },
                        polygonOptions: {
                            editable: true
                        }
            });
            drawingManager.setMap(map);

            google.maps.event.addListener(drawingManager, "overlaycomplete", function(event) {
                var newShape = event.overlay;
                newShape.type = event.type;
            });

            google.maps.event.addListener(drawingManager, 'overlaycomplete', function(event) {
                $('#vertices').val(event.overlay.getPath().getArray());
            });
        }
 initialize();

$(function(){
    $('#save').click(function(){
        //iterate polygon vertices?
    });
});

Answer 1

想通了!!

我添加了函数 overlayClickListener:

function overlayClickListener(overlay) {
    google.maps.event.addListener(overlay, "mouseup", function(event){
        $('#vertices').val(overlay.getPath().getArray());
    });
}

并将其附加到 overlaycomplete 上的叠加层:

google.maps.event.addListener(drawingManager, "overlaycomplete", function(event){
                overlayClickListener(event.overlay);
                $('#vertices').val(event.overlay.getPath().getArray());
            });

有关实际解决方案，请参见此处:http://jsfiddle.net/rvsMH/1/