Cross-Compatible Event Listening / Firing

evtlst.js

/* Copyright (c) Kenan Sulayman, et al. Do what ever you want, as long as you're crediting the AUTOR. */

Function.prototype.bind = function (object) {
        var method = this;
        return function () {
                return method.apply(object, arguments);
        };
};

function EX() {
        this.events = [];
        this.builtinEvts = [];
}

EX.prototype.getActionIdx = function (obj, evt, action, binding) {
        if (obj && evt) {
                var curel = this.events[obj][evt];
                if (curel) {
                        var len = curel.length;
                        for (var i = len - 1; i >= 0; i--) {
                                if (curel[i].action == action && curel[i].binding == binding) {
                                        return i;
                                }
                        }
                } else {
                        return -1;
                }
        }
        return -1;
};

EX.prototype.addListener = function (obj, evt, action, binding) {
        if (this.events[obj]) {
                if (this.events[obj][evt]) {
                        if (this.getActionIdx(obj, evt, action, binding) == -1) {
                                var curevt = this.events[obj][evt];
                                curevt[curevt.length] = {
                                        action: action,
                                        binding: binding
                                };
                        }
                } else {
                        this.events[obj][evt] = [];
                        this.events[obj][evt][0] = {
                                action: action,
                                binding: binding
                        };
                }
        } else {
                this.events[obj] = [];
                this.events[obj][evt] = [];
                this.events[obj][evt][0] = {
                        action: action,
                        binding: binding
                };
        }
};

EX.prototype.removeListener = function (obj, evt, action, binding) {
        if (this.events[obj]) {
                if (this.events[obj][evt]) {
                        var idx = this.actionExists(obj, evt, action, binding);
                        if (idx >= 0) 
                                this.events[obj][evt].splice(idx, 1);
                }
        }
};

EX.prototype.fireEvent = function (e, obj, evt, args) {
        if (!e)
                e = window.event;
        if (obj && this.events) {
                var evtel = this.events[obj];
                if (evtel) {
                        var curel = evtel[evt];
                        if (curel) {
                                for (var act in curel) {
                                        var action = curel[act].action;
                                        if (curel[act].binding) {
                                                action = action.bind(curel[act].binding);
                                        }
                                        
                                        try{
                                                action(e, args);
                                        } catch (e) {}
                                }
                        }
                }
        }
};

var Events = {
        NS: new EX(),
        listen: function ( o, e, strct, f, b ) { this.C[o] = function() { (function(){ e(); this.C[o](); }); }; return this.NS.addListener ( o, this.C[o], f, b ); },
        fire: function ( err, o, e, a ) { return this.NS.fireEvent ( err, o, e, a ); },
        remove: function ( o, e, a, b ) { return this.NS.removeListener ( o, e, a, b ); },
        idx: function ( o, e, a, b ) { return this.NS.getActionIdx ( o, e, a, b ); }
}

function Evt() {}

Evt.prototype.fire = function ( e ) {
        Events.fire(null, this, e);
};

Evt.prototype.listen = function ( e, f ) {
        return Events.NS.addListener(this, e, f);
}

function fire ( e ) { return Evx.fire ( e ); }
function listen ( e, f ) { return Evx.listen ( e, f ); }

var Evx = new Evt();

/*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*/

// REMOVE IN PRODUCTION

// -*TEST*-
listen ( "load", function () {
        return console.log("Hooray, it's working!");
});

fire( "load" )

/*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*--*TEST*/