Maxlength on textarea

maxlength.js

// Triggers "updated.maxlength" event when updated (post-keyup)
// evt sends: { maxlength: Number, remaining: Number }

(function($){
    var f = function(num){
        return this.each(function(){
            var $this = $(this),
                chars = num || $this.attr("data-maxlength") || f.num,
                remaining = function(){ return chars - $this.val().length };
            if(this.nodeName.toLowerCase() == "textarea"){
                $this.bind("keyup.maxlength", function(){
                    var val = $this.val();
                    val.length > chars && $this.val(val.substr(0,chars))
                    $this.trigger("updated.maxlength",{ maxlength: chars, remaining: remaining() });
                });
           }
        });        
    }
    f.num = 100;
    $.extend($.fn, { maxlength: f });
})(jQuery);