jQuery slugify a url

jquery.slugify.js

;(function ($, window, document, undefined) {
    // Define the jQuery plugin name and some default options
    var pluginName = 'slugify',
        defaults = {
            on: "blur",
            prefix: ''
        };

    // The actual plugin constructor
    function Slugify(element, options) {
        this.element = element;
        this.options = $.extend({}, defaults, options);

        this._defaults = defaults;
        this._name = pluginName;

        this.init();
    }

    Slugify.prototype.init = function () {
        var events = this.options.on.split(' '),
            self = this;
            
        // Space de-limited list of events, "keyup blur keydown".
        // Bind the events to the slugTo function
        $.map(events, function(e) {
            $(self.element).bind(e, $.proxy(self.slugTo, self));
        });
    };
    
    // Slug the field that the plugin is attached to,
    // and place the result in some other field defined
    // by the slugTo option.
    Slugify.prototype.slugTo = function(event) {
        var thisElement = $(this.element),
            text = thisElement.val(), 
            element;
        
        text = text.toLowerCase();
        text = text.replace(/^\s+|\s+$/g, ''); // trim
        text = text.replace( /[^a-zA-Z0-9]+/g , '-');
        text = text.replace( /\-+$/g, '');
        this.text = text;
        
        // Store the slug on the data for the DOM element being used
        thisElement.data('slug', this.text);

        if(this.options.slugTo) {
            if(typeof this.options.slugto === 'object') {
                element = this.options.slugto;
            }
            else {
                element = $(this.options.slugTo);
            }
        }
        else {
            element = thisElement;
        }
        
        if(element) {
            element.val(this.options.prefix + this.text);    
        }
        
    };

    // Expose the plugin to jQuery
    // http://coding.smashingmagazine.com/2011/10/11/essential-jquery-plugin-patterns/
    $.fn[pluginName] = function(options, arg) {
        return this.each(function() {
            if(typeof options === 'object' || typeof options === 'undefined'){
				if (!$.data(this, 'plugin_' + pluginName)) {
					$.data(this, 'plugin_' + pluginName,
					new Slugify( this, options ));
				}
			}
			else if(typeof options === 'string'){
				var plugin = $.data(this, 'plugin_' + pluginName);
				
				if(typeof plugin[options] === 'function'){
					plugin[options](arg);
				}
				else{
					throw('Invalid method: ' + options + ' called on plugin: ' + pluginName);
				}
			}
        });
    };

})(jQuery, window, document);