我如何绑定一个谷歌地图的地理coder.geo code()回调函数 [英] How do I bind a google maps geocoder.geocode() callback function
问题描述
我有一个包含视图范围内通过的 this.map 的访问的谷歌地图的视图。一切都很好,在世界上。
I have a view that contains a google map accessible via this.map within the view scope. All is well in the world.
接下来,我想通过更新在我看来,事件的地图位置。要做到这一点,我需要文本输入,可使用google.maps.Geo coder.geo code(),然后通过更新的位置是:
Next I want to update the map position via events in my view. To do this I take text input, use google.maps.Geocoder.geocode(), then update the position via:
setMapLocation:功能(位置){
setMapLocation: function (location) {
_.bind(this.setMapLocationCallback, this);
console.log(this);
var geocoder = new google.maps.Geocoder();
geocoder.geocode({'address': location}, this.setMapLocationCallback);
},
的的console.log(本)的这里表明我的观点的范围,用的 this.map 的正常访问。请注意,我的回调明确绑定到这个位置。这里的回调:
The console.log(this) here shows me the scope of the view, with this.map properly accessible. Notice that I explicitly bind the callback to this here. Here's the callback:
setMapLocationCallback: function (results, status) {
console.log('this in the callback');
console.log(this);
if (status == google.maps.GeocoderStatus.OK) {
this.map.setCenter(results[0].geometry.location);
var marker = new google.maps.Marker({
map: this.map,
position: results[0].geometry.location
});
this.mapCanvas.css({visibility: 'visibile'});
} else {
this.mapCanvas.css({visibility: 'hidden'});
}
},
存在的问题是,回调内部的的console.log(本)的显示,这个的作用范围是Window对象的即使我约束它明确视图对象的这个范围。
The problems is that inside the callback console.log(this) shows that this is scoped to the Window object even though I bound it explicitly to the view object's this scope.
我需要访问this.map回调,因为我可能有一个页面上的多个地图,需要区分我说的是哪一个。
I need to access this.map in the callback because I may have more than one map on a page and need to distinguish which one I'm talking about.
如何绑定这个回调到合适的范围是什么?或者,有没有更好的方法来做到这一点?
How do I bind this callback to the proper scope? or, is there a better way to do this?
我使用backbonejs和underscorejs,但这应该是一个相当普遍的问题。
I'm using backbonejs and underscorejs, but this should be a fairly generic problem.
在此先感谢,
大卫
Thanks in advance, David
推荐答案
请尝试更改
geocoder.geocode({'address': location}, this.setMapLocationCallback);
使用()调用
,所以你可以改变这个
在 setMapLocationCallback范围
var _this = this;
geocoder.geocode({'address': location}, function(result, status) {
_this.setMapLocationCallback.call(_this, result, status);
});
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