addEventListener及其范围 [英] addEventListener and the scope of this

问题描述

我有第三方Flash对象，我可以通过他们提供的JavaScript API进行操作。我试着在这个对象上听一个事件，然后在我的对象中触发事件来进一步冒泡事件。我碰巧使用的是EXT Js，但我认为它不重要。

I have a third party flash object which i can manipulate through a javascript API they provided. I am tryind to listen to an event on this object and then fire event inside my object to further bubble up the event. I happen to being using EXT Js but i dont think its important here.

示例代码

this.chart.addEventListener('create', function() {
    this.fireEvent('created');
}, false)

我的问题是匿名函数中的'this'是指触发事件的对象，而不是我要触发事件的对象on。

My problem is that 'this' inside the anonymous function refers to the object that fired the event rather than my object that I want to fire an event on.

这是另一个范围问题。在此先感谢您的帮助。

Its yet another scope issue. Thanks in advance for any help.

推荐答案

这是解决此问题的典型方法： -

This is the typical approach to this problem:-

(function(self) {
  self.chart.addEventListener('create', function() {self.fireEvent('created');}, false);
})(this);

这篇关于addEventListener及其范围的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！