谷歌地图：点击监听器添加到每个多边形 [英] Google map: Add click listener to each polygon

问题描述

我工作的web应用。
我有一个谷歌地图，在这里我从阵列添加多边形。我通过数组循环和多边形添加到地图。我还需要一个事件监听器添加到多边形点击并提醒多边形的位置

I am working on a webapplication. I have a google map, where I add polygons from an array. I loop through that array and add the polygons to the map. I also need to add an event listener to the polygon click and alert the position of the polygon

这是我在做什么。

map = new google.maps.Map(document.getElementById('map_canvas'),
    mapOptions);
//Loop on the polygonArray
for (var i = 0; i < polygonArray.length; i++) {
    //Add the polygon
    var p = new google.maps.Polygon({
        paths: polygonArray[i],
        strokeWeight: 0,
        fillColor: '#FF0000',
        fillOpacity: 0.6,
        indexID: i
    });
    p.setMap(map);

    //Add the click listener
    google.maps.event.addListener(p, 'click', function (event) {
        //alert the index of the polygon
        alert(p.indexID);
    });
}

问题

的多边形绘图全部正确。然而，问题是，当我尝试点击一个多边形它总是显示最后一个索引。它像它只是点击最后一个多边形补充说。我想，当我添加一个新的监听器，它会覆盖旧的。我如何添加一个侦听器，以提醒正确的指数上涨了每个多边形？

The polygons are all drawing correctly. However the problem is that when I try to click on a polygon it always shows the last index. it is like it is only clicking on the last polygon added. I think when I add a new listener it overrides the old one. How can I add a listener for each polygon added in order to alert the correct index?

感谢

推荐答案

这是正常行为。
有两种解决方案，我能想到的：

It's the normal behavior. There is two solutions that I can think of :

1）我相信你可以从上下文找回来多边形（我没有测试）：

1) I am sure you can find back the polygon from the context (I didn't test it):

google.maps.event.addListener(polygon, 'click', function (event) {
  alert(this.indexID);
});  

2）您也可以使用一些封的：

var addListenersOnPolygon = function(polygon) {
  google.maps.event.addListener(polygon, 'click', function (event) {
    alert(polygon.indexID);
  });  
}

map = new google.maps.Map(document.getElementById('map_canvas'),
    mapOptions);
//Loop on the polygonArray
for (var i = 0; i < polygonArray.length; i++) {
    //Add the polygon
    var p = new google.maps.Polygon({
        paths: polygonArray[i],
        strokeWeight: 0,
        fillColor: '#FF0000',
        fillOpacity: 0.6,
        indexID: i
    });
    p.setMap(map);
    addListenersOnPolygon(p);
}

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