/*

  @author: remy sharp / http://remysharp.com

  @params:

    feedback - the selector for the element that gives the user feedback. Note that this will be relative to the form the plugin is run against.

    hardLimit - whether to stop the user being able to keep adding characters. Defaults to true.

    useInput - whether to look for a hidden input named 'maxlength' instead of the maxlength attribute. Defaults to false.

    words - limit by characters or words, set this to true to limit by words. Defaults to false.

  @license: Creative Commons License - ShareAlike http://creativecommons.org/licenses/by-sa/3.0/

  @version: 1.2

  @changes: code tidy via Ariel Flesler and fix when pasting over limit and including \t or \n

*/

​

(function ($) {

​

$.fn.maxlength = function (settings) {

​

    if (typeof settings == 'string') {

        settings = { feedback : settings };

    }

​

    settings = $.extend({}, $.fn.maxlength.defaults, settings);

​

    function length(el) {

      var parts = el.value;

      if ( settings.words )

        parts = el.value.length ? parts.split(/\s+/) : { length : 0 };

      return parts.length;

    }

    return this.each(function () {

        var field = this,

          $field = $(field),

          $form = $(field.form),

          limit = settings.useInput ? $form.find('input[name=maxlength]').val() : $field.attr('maxlength'),

          $charsLeft = $form.find(settings.feedback);

​

      function limitCheck(event) {

          var len = length(this),

              exceeded = len >= limit,

            code = event.keyCode;

​

          if ( !exceeded )

            return;

​

            switch (code) {

                case 8:  // allow delete

                case 9:

                case 17:

                case 36: // and cursor keys

                case 35:

                case 37: 

                case 38:

                case 39:

                case 40:

                case 46:

                case 65:

                    return;

​

                default:

                    return settings.words && code != 32 && code != 13 && len == limit;

            }

        }

​

​

        var updateCount = function () {

            var len = length(field),

              diff = limit - len;

​

            $charsLeft.html( diff || "0" );

​

            // truncation code

            if (settings.hardLimit && diff < 0) {

              field.value = settings.words ? 

                  // split by white space, capturing it in the result, then glue them back

                field.value.split(/(\s+)/, (limit*2)-1).join('') :

                field.value.substr(0, limit);

​

                updateCount();

            }

        };

​

        $field.keyup(updateCount).change(updateCount);

        if (settings.hardLimit) {

            $field.keydown(limitCheck);

        }

​

        updateCount();

    });

};

​

$.fn.maxlength.defaults = {

    useInput : false,

    hardLimit : true,

    feedback : '.charsLeft',

    words : false

};

​

})(jQuery);

​