如何为javascript中的所有事件添加事件侦听器而不单独列出它们? [英] How can I add an event listener for all events in javascript without listing them individually?

问题描述

我想使用通配符(我认为不存在?)完成以下代码

I'd like to accomplish the following code using a wildcard (that I don't think exists?)

myObject.element = document.getElementsByClassName('js-myObject');
myObject.element.addEventListener('click', myObject.click);
myObject.element.addEventListener('mouseover', myObject.mouseover);
//etc..

到目前为止，我有以下内容

So far, I have the following

myObject.controller = function(e){
   if( (e.type in myObject) && (typeof myObject[e.type] ==='function') ){
      myObject[e.type](e);
   }
};

//but the listeners still have to be assigned as such
myObject.element = document.getElementsByClassName('js-myObject');
myObject.element.addEventListener('click', myObject.controller);
myObject.element.addEventListener('mouseover', myObject.controller);
//etc...


// but I want to do (and it doesn't work)
myObject.element.addEventListener('*', myObject.controller);

对于事件数组和 foreach 语句以外的方法有什么建议吗?

Any suggestions on methods other than an array of events and a foreach statement?

我已经接受了下面的答案(没有可用的通配符，解析可能有数百个事件是个坏主意)

I've accepted an answer below (there's no wildcard available, and it's a bad idea to parse potentially hundreds of events)

对于那些正在寻找类似功能的人，我已经确定了以下方法，至少目前是这样.

For those looking for a similar function, I've settled on the following approach, at least for now.

for(var prop in myObject){
  if (!myObject.hasOwnProperty(prop){continue;}
  if (typeof myObject[prop] !== 'function'){continue;}
  myObject.element.addEventListener(prop, myObject[prop]);
}

好处是自定义事件的处理程序，我不必返回并为其添加侦听器.缺点是我必须确保在定义每个 myObject.someEvent() 之后调用此函数.我在 myObject.init() 中调用它；这对我来说很好用.请注意，此解决方案不符合我以前的规范，因为它使用了 for/each 循环——但它完成了我真正想要完成的工作，非常感谢 @torazaburo 明确定义了我的技术限制和缺乏智慧初步计划.

The upside is a handler for custom events that I don't have to go back and add listeners for. The downside is that I have to ensure this function is called after every myObject.someEvent() is defined. I call it in myObject.init(); which works for me just fine. Note that this solution wouldn't fit my previous specs, because it uses a for/each loop -- but it accomplishes what i really wanted to accomplish and a big thanks to @torazaburo for clearly defining the technical limitations and lack of wisdom in my initial plan.

推荐答案

没有添加 * 侦听器的功能，我怀疑您是否希望某个元素上的数百个事件被侦听.

There is no feature to add a * listener, and I doubt if you want hundreds of events on an element being listened for anyway.

顺便说一句，您应该使用涉及EventListener 接口和 handleEvent它定义的方法.

By the way, instead of your roll-your-own architecture for a generic event handler in the form of your myObject.controller, you should use the under-appreciated approach involving the EventListener interface and the handleEvent method it defines.

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