在addeventlistener中使用此关键字调用javascript类的方法 [英] calling javascript class's method using this keyword in addeventlistener

问题描述

我想通过addEventListener调用类"Example"中的函数getItemList()

I want to call the function getItemList() which is in a class 'Example' through addEventListener

var text_box = document.getElementById(this.text_box_id);
text_box.addEventListener('onchange', function(){this.getItemList('3', '10')}, false) 

推荐答案

应为change，而不是onchange.仅在IE中，您必须使用on(EventName).

It should be change, not onchange. Only in IE you have to use on(EventName).

this将引用text_box(引发事件的元素).您必须捕获对当前this的引用:

this inside the handler will refer to text_box (the element the event was raised on). You have to capture a reference to the current this:

var that = this;
text_box.addEventListener('change', function(){    
    that.getItemList('3', '10')
}, false);

或在支持 bind 的浏览器中(您可以还提供了本文档中所示的您自己的实现):

Or in browsers supporting bind (you can also provide your own implementation as shown in this documentation):

text_box.addEventListener('change', function(){    
    this.getItemList('3', '10')
}.bind(this), false);

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