Google地图V3不会移除事件侦听器 [英] Google Maps V3 doesn't remove event listener

问题描述

我在使用Google Maps API v3时遇到问题。

I have a problem with Google Maps API v3. I'm trying to remove a mouseover listener when zoom changes.

以下是我的代码：

Here is my code:

$(document).ready(function() {

    var myOptions = {
        ...
    };

    var map = new google.maps.Map(document.getElementById("map_canvas"), myOptions);

    function colormaps(map) {
        var newmap = map;
        var piemonteCoords = [
            ...
        ];        
        var piemontePolygon = new google.maps.Polygon({
            ...
        });         
        piemontePolygon.setMap(newmap);
        google.maps.event.addListener(piemontePolygon, 'mouseover', function(event) {
            var prova = event;
            showInfo(prova, newmap, 'Italy');
        });

        google.maps.event.addListener(newmap, 'zoom_changed', function() {
            zoomLevel = map.getZoom();
            if (zoomLevel >= 6) {
                google.maps.event.clearListeners(newmap, 'mouseover');
            }
            else {
                ...
            }
        } //fine colormaps
        google.maps.event.addDomListener(window, 'load', colormaps(map));
    });

当缩放到达目标级别时，侦听器不会被删除。怎么了？

When zoom reaches the target level, the listener is not removed. What's wrong?

推荐答案

您正在将侦听器添加到 piemontePolygon 重新从 newmap 对象清除它，这可能是错误的（我不是那个领域的专家，所以我不能确定）。

You're adding listener to piemontePolygon object, but you're clearing it from newmap object, which probably is wrong(I'm not an expert in that area so I can't be sure).

尝试这样做：

Try doing it like:

google.maps.event.clearListeners(piemontePolygon, 'mouseover');

编辑：

根据文档，您可以尝试使用另一个aproach，如果上面的代码失败。

According to docs you could try it with another aproach, if above code fails.

案例1（您也可以将事件类型作为第二个参数传递）：

Case 1 (you could pass event type as second argument as well):

google.maps.event.clearInstanceListeners(piemontePolygon);

案例2：

Case 2:

var listener1 = google.maps.event.addListener(piemontePolygon, 'mouseover', function(
    var prova = event;
    showInfo(prova, newmap, 'Italy')
});

google.maps.event.removeListener(listener1);

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