jquery.addEventListener.js

jquery.addEventListener.js

(function ($, window, document)
{
    /**
     * @version 0.3.0
     */

    /**
     * A bind polyfill for browsers that don't support the bind method.
     */
    if (!Function.prototype.bind) {
        Function.prototype.bind = function (oThis) {
            if (typeof this !== "function") {
                // closest thing possible to the ECMAScript 5 internal IsCallable function
                throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
            }

            var aArgs = Array.prototype.slice.call(arguments, 1),
                fToBind = this,
                fNOP = function () {},
                fBound = function () {
                    return fToBind.apply(this instanceof fNOP && oThis
                        ? this
                        : oThis,
                        aArgs.concat(Array.prototype.slice.call(arguments)));
                };

            fNOP.prototype = this.prototype;
            fBound.prototype = new fNOP();

            return fBound;
        };
    }

    /**
     * Generates a hash string from the string being passed in. In this case it is a function that is casted as string value.
     *
     * @param str
     * @returns {String}
     */
    var hashCode = function (str)
    {
        str = String(str);
        // http://erlycoder.com/49/javascript-hash-functions-to-convert-string-into-integer-hash-
        var character;
        var hash = null;
        var strLength = str.length;

        if (strLength == 0) return hash;

        for (var i = 0; i < strLength; i++)
        {
            character = str.charCodeAt(i);
            hash = ((hash << 5) - hash) + character;
            hash = hash & hash; // Convert to 32bit integer
        }

        return String(Math.abs(hash));
    }

    /**
     * The jQuery addEventListener plugin
     */
    $.fn.addEventListener = function (type, selector, data, callback, scope)
    {
        var _callback;
        var _scope;
        var _handler;
        switch (arguments.length)
        {
            case 3:
                _callback = selector;
                _scope = data;
                _scope._handlerMap = _scope._handlerMap || {};
                _handler = _scope._handlerMap[hashCode(_callback)] = _callback.bind(_scope);
                this.on(type, _handler);
                break;
            case 4:
                _callback = data;
                _scope = callback;
                _scope._handlerMap = _scope._handlerMap || {};
                _handler = _scope._handlerMap[hashCode(_callback)] = _callback.bind(_scope);
                this.on(type, selector, _handler);
                break;
            case 5:
                _callback = callback;
                _scope = scope;
                _scope._handlerMap = _scope._handlerMap || {};
                _handler = _scope._handlerMap[hashCode(_callback)] = _callback.bind(_scope);
                this.on(type, selector, data, _handler);
                break;
            default:
                throw new Error('jQuery addEventListener plugin requires at least 3 arguments.')
        }
        return this;
    }

    /**
     * The jQuery removeEventListener plugin
     */
    $.fn.removeEventListener = function (type, selector, callback, scope)
    {
        var _callback;
        var _scope;
        var _handler;

        switch (arguments.length)
        {
            case 3:
                _callback = selector;
                _scope = callback;
                _scope._handlerMap = _scope._handlerMap || {};
                _handler = _scope._handlerMap[hashCode(_callback)];
                this.off(type, _handler);
                _scope._handlerMap[hashCode(_callback)] = null;
                break;
            case 4:
                _callback = callback;
                _scope = scope;
                _scope._handlerMap = _scope._handlerMap || {};
                _handler = _scope._handlerMap[hashCode(_callback)];
                this.off(type, selector, _handler);
                _scope._handlerMap[hashCode(_callback)] = null;
                break;
            default:
                throw new Error('jQuery removeEventListener plugin requires at least 3 arguments.')
        }
        return this;
    }

})(jQuery, window, document);