获得所有DOM事件的数组

Question

我创建了一个多用途工厂事件发射器工厂功能.有了它,我可以将对象转换为事件发射器.如果有人想要查看或使用它,事件发射器工厂的代码如下.

我的问题是如何从DOM中获取事件列表.请注意我不是要获取绑定事件列表.我想要一份所有可能的活动清单.我想为发射器添加"管道"方法.此方法将获取DOM对象并绑定到所有可能的事件,然后当任何这些事件触发时,将触发发射器中具有相同名称的事件.

我不认为有办法做到这一点.我准备制作一个硬编码的事件名称数组,但是如果我可以获得更好的DOM数组,那么如果W3C标准化了更多的事件类型,它仍然可以工作.

PS如果你为W3C工作,那就是那种让每个人都讨厌DOM的垃圾.请停止像玩具语言一样对待JavaScript.它不是玩具语言,需要的不仅仅是玩具DOM.

/**
 * Creates a event emitter
 */
function EventEmitter() {
    var api, callbacks;

    //vars
    api = {
        "on": on,
        "trigger": trigger
    };
    callbacks = {};

    //return the api
    return api;

    /**
     * Binds functions to events
     * @param event
     * @param callback
     */
    function on(event, callback) {
        var api;

        if(typeof event !== 'string') { throw new Error('Cannot bind to event emitter. The passed event is not a string.'); }
        if(typeof callback !== 'function') { throw new Error('Cannot bind to event emitter. The passed callback is not a function.'); }

        //return the api
        api = {
            "clear": clear
        };

        //create the event namespace if it doesn't exist
        if(!callbacks[event]) { callbacks[event] = []; }

        //save the callback
        callbacks[event].push(callback);

        //return the api
        return api;

        function clear() {
            var i;
            if(callbacks[event]) {
                i = callbacks[event].indexOf(callback);
                callbacks[event].splice(i, 1);

                if(callbacks[event].length < 1) {
                    delete callbacks[event];
                }

                return true;
            }
            return false;
        }
    }

    /**
     * Triggers a given event and optionally passes its handlers all additional parameters
     * @param event
     */
    function trigger(event    ) {
        var args;

        if(typeof event !== 'string' && !Array.isArray(event)) { throw new Error('Cannot bind to event emitter. The passed event is not a string or an array.'); }

        //get the arguments
        args = Array.prototype.slice.apply(arguments).splice(1);

        //handle event arrays
        if(Array.isArray(event)) {

            //for each event in the event array self invoke passing the arguments array
            event.forEach(function(event) {

                //add the event name to the begining of the arguments array
                args.unshift(event);

                //trigger the event
                trigger.apply(this, args);

                //shift off the event name
                args.shift();

            });

            return;
        }

        //if the event has callbacks then execute them
        if(callbacks[event]) {

            //fire the callbacks
            callbacks[event].forEach(function(callback) { callback.apply(this, args); });
        }
    }
}

Answer 1

这是一个适用于Chrome,Safari和FF的版本.

Object.getOwnPropertyNames(document).concat(Object.getOwnPropertyNames(Object.getPrototypeOf(Object.getPrototypeOf(document)))).filter(function(i){return !i.indexOf('on')&&(document[i]==null||typeof document[i]=='function');})

UPD:

这是适用于IE9 +,Chrome,Safari和FF的版本.

Object.getOwnPropertyNames(document).concat(Object.getOwnPropertyNames(Object.getPrototypeOf(Object.getPrototypeOf(document)))).concat(Object.getOwnPropertyNames(Object.getPrototypeOf(window))).filter(function(i){return !i.indexOf('on')&&(document[i]==null||typeof document[i]=='function');}).filter(function(elem, pos, self){return self.indexOf(elem) == pos;})

PS:结果是一系列事件名称,如["onwebkitpointerlockerror", "onwebkitpointerlockchange", "onwebkitfullscreenerror", "onwebkitfullscreenchange", "onselectionchange", "onselectstart", "onsearch", "onreset", "onpaste", "onbeforepaste", "oncopy"]... ect.

Answer 2

所有DOM事件都以on.您可以循环遍历任何Element实例,并列出所有以on.开头的属性.

例.在控制台中复制粘贴以下代码(Firefox,使用Array comprehensions;)):

[i for(i in document)].filter(function(i){return i.substring(0,2)=='on'&&(document[i]==null||typeof document[i]=='function');})

获取事件的另一种方法是查看规范,其中显示:

  // event handler IDL attributes
  [TreatNonCallableAsNull] attribute Function? onabort;
  [TreatNonCallableAsNull] attribute Function? onblur;
  [TreatNonCallableAsNull] attribute Function? oncanplay;
  [TreatNonCallableAsNull] attribute Function? oncanplaythrough;
  [TreatNonCallableAsNull] attribute Function? onchange;
  [TreatNonCallableAsNull] attribute Function? onclick;
  [TreatNonCallableAsNull] attribute Function? oncontextmenu;
  [TreatNonCallableAsNull] attribute Function? oncuechange;
  [TreatNonCallableAsNull] attribute Function? ondblclick;
  [TreatNonCallableAsNull] attribute Function? ondrag;
  [TreatNonCallableAsNull] attribute Function? ondragend;
  [TreatNonCallableAsNull] attribute Function? ondragenter;
  [TreatNonCallableAsNull] attribute Function? ondragleave;
  [TreatNonCallableAsNull] attribute Function? ondragover;
  [TreatNonCallableAsNull] attribute Function? ondragstart;
  [TreatNonCallableAsNull] attribute Function? ondrop;
  [TreatNonCallableAsNull] attribute Function? ondurationchange;
  [TreatNonCallableAsNull] attribute Function? onemptied;
  [TreatNonCallableAsNull] attribute Function? onended;
  [TreatNonCallableAsNull] attribute Function? onerror;
  [TreatNonCallableAsNull] attribute Function? onfocus;
  [TreatNonCallableAsNull] attribute Function? oninput;
  [TreatNonCallableAsNull] attribute Function? oninvalid;
  [TreatNonCallableAsNull] attribute Function? onkeydown;
  [TreatNonCallableAsNull] attribute Function? onkeypress;
  [TreatNonCallableAsNull] attribute Function? onkeyup;
  [TreatNonCallableAsNull] attribute Function? onload;
  [TreatNonCallableAsNull] attribute Function? onloadeddata;
  [TreatNonCallableAsNull] attribute Function? onloadedmetadata;
  [TreatNonCallableAsNull] attribute Function? onloadstart;
  [TreatNonCallableAsNull] attribute Function? onmousedown;
  [TreatNonCallableAsNull] attribute Function? onmousemove;
  [TreatNonCallableAsNull] attribute Function? onmouseout;
  [TreatNonCallableAsNull] attribute Function? onmouseover;
  [TreatNonCallableAsNull] attribute Function? onmouseup;
  [TreatNonCallableAsNull] attribute Function? onmousewheel;
  [TreatNonCallableAsNull] attribute Function? onpause;
  [TreatNonCallableAsNull] attribute Function? onplay;
  [TreatNonCallableAsNull] attribute Function? onplaying;
  [TreatNonCallableAsNull] attribute Function? onprogress;
  [TreatNonCallableAsNull] attribute Function? onratechange;
  [TreatNonCallableAsNull] attribute Function? onreset;
  [TreatNonCallableAsNull] attribute Function? onscroll;
  [TreatNonCallableAsNull] attribute Function? onseeked;
  [TreatNonCallableAsNull] attribute Function? onseeking;
  [TreatNonCallableAsNull] attribute Function? onselect;
  [TreatNonCallableAsNull] attribute Function? onshow;
  [TreatNonCallableAsNull] attribute Function? onstalled;
  [TreatNonCallableAsNull] attribute Function? onsubmit;
  [TreatNonCallableAsNull] attribute Function? onsuspend;
  [TreatNonCallableAsNull] attribute Function? ontimeupdate;
  [TreatNonCallableAsNull] attribute Function? onvolumechange;
  [TreatNonCallableAsNull] attribute Function? onwaiting;

  // special event handler IDL attributes that only apply to Document objects
  [TreatNonCallableAsNull,LenientThis] attribute Function? onreadystatechange;