如何以编程方式确定HTML对象可以侦听哪些事件？ [英] How do you programmatically determine to which events an HTML object can listen for?

问题描述

我一直在浏览developer.mozilla.org和Apple Dev文档中的文档，但是我无法找到文档，说明是否可以通过编程方式确定特定的HTML标签是否支持给定的eventListener。

I've been looking over the docs at developer.mozilla.org and the Apple dev docs but I'm not able to find documentation that explains whether or not you can programatically determine if a specific HTML tag supports a given eventListener.

像我知道< script> 标签不会支持点击监听器，因为没有点击，但是我怎么知道？

Like I know that the <script> tag isn't going to support the click listener since there's nothing to click on, but how do I know that?

或者禁止这个，每个标签支持哪些事件的地方有简单的参考？

Or barring that, is there an easy reference somewhere of what events each tag supports?

推荐答案

根据完美杀死：

诀窍是许多现代浏览器报告属性对应于一个元素中存在的事件名称。

The trick is that many modern browsers report property corresponding to an event name as being existent in an element.

基本上，代码如下所示：

Basically, the code looks like this:

'onclick' in document.documentElement; // true
'onclick2' in document.documentElement; // false

他使用它来检测各种浏览器中的事件支持，但也可以用于检测元素是否支持事件：

He uses it to detect event support in various browsers, but it could also be used to detect whether or not an element supports an event:

必须对可能实际发生该事件的元素检查事件。 >

An event must be checked on an element that could actually originate that event.

所以你也得到这样的结果：

So you also get results like this:

'onreset' in document.documentElement; // false
'onreset' in document.createElement('input'); // true

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