Watch all DOM and jQuery events active on a page and log when they fire

debug-fired-events.js

window.watchEvents = function() {
    var eventIds = [
        'click', 'mousedown', 'mouseup',
        'touch', 'touchstart', 'touchend',
        'focus', 'focusin', 'focusout', 'blur',
        'mouseover', 'mouseout', 'mousemove', 'mouseenter', 'mouseleave', 'mousewheel',
        'keypress', 'keydown', 'keyup',
        'change',
        'scroll', 'resize',
        'submit', 'reset',
        'contextmenu', 'select',
        'copy', 'cut', 'paste',
        'dblclick',
        'load', 'unload',
        'hashchange',
    ];

    function wrapLogging(handler, evtType)
    {
        return function(e) {
            // debugger;
            console.log('Fired ' + evtType + ' on:', e.target);
            console.log('Target / delegate:', [e.currentTarget, e.delegateTarget]);
            handler.apply(this, arguments);
        };
    }

    console.log('---------------- BINDING EVENT WATCHERS ----------------');

    (function () {
        var elements = $('*');

        elements.each(function() {
            var elem = this;

            // Watch regular DOM events

            eventIds.forEach(function(evt) {
                if (elem['on' + evt]) {
                    var handler = elem['on' + evt];

                    console.log('Found DOM ' + evt + ' event for', elem);

                    elem['on' + evt] = wrapLogging(handler, evt);
                }
            });

            // Watch jQuery events

            var data = $._data(this);
            if (!data || !data.events) {
                return;
            }

            for (var evtType in data.events) {
                var evts = data.events[evtType];

                evts.forEach(function (evt) {
                    var handler = evt.handler;

                    console.log('Found JQ  ' + evtType + ' event for', elem);

                    evt.handler = wrapLogging(handler, evtType);
                });
            }
        });
    })();

    console.log('---------------- EVENT WATCHERS INITED ----------------');
    console.log('');
};