无法删除谷歌地图中的事件侦听器

Cannot remove event listener in GoogleMaps

本文关键字:事件 侦听器 谷歌地图 删除      更新时间:2023-09-26

我有一个事件,我点击按钮就注册了:

 var paths=[];
 var mapPolylineListener=e.addEventToTarget(map,'click',function(event){
    //keep adding points to the array
    //draw the polyline if there are two points
    //extend the polyline with this point once it has been drawn 
 }
 e.addEventToTargetOnce(map,'rightclick',function(event){
    console.log('Polyline right click event called');
    if(typeof mapPolylineListener!='undefined')
    {
      console.log('stop drawing the map listener');
          //do stuff here like encoding to geometry and making AJAX calls
      paths=[];
      mapPolylineListener=void 0;
    }               

事件模块定义以下函数:

  addEventToTarget:function(onWhat,eventType,fn)
  {
     gmaps.event.addListener(onWhat,eventType,fn);
  }
  addEventToTargetOnce:function(onWhat,eventType,fn)
  {
    gmaps.event.addListenerOnce(onWhat,eventType,fn);
  }

正在使用requirejs模块,我使用模块来指定功能:

 e=gmaps.event;
 gmaps=window.google.maps;

在我的控制台中,它显示:

  Polyline right click event called

而且检查似乎总是失败

 if(typeof mapPolylineListener!='undefined')

所以,我尝试做一个!=nullif(mapPolylineListener)检查都失败了。

如何解决此问题以执行 if 块中的代码?

我不确定requirejs模块是如何工作的...由于addEventToTarget没有返回任何内容,因此我将更改以下内容:

addEventToTarget:function(onWhat,eventType,fn)
{
    var handle = gmaps.event.addListener(onWhat,eventType,fn);
    return handle;
}

然后拨打removeListener(mapPolylineListener) e.addEventToTargetOnce(map,'rightclick',function(event){...