Restricts number of characters to maxlength in textarea

textarea-maxlength.js

// Textarea maxlength
// Ensures that textarea's maxlength is validated
//
// (c) S Anand, 2010, MIT License
// Credits: http://yelotofu.com/2009/12/jquery-textarea-max-length/
// Credits: http://stackoverflow.com/questions/43569/max-length-for-html-text-areas

(function() {
var ignore = [8,9,13,33,34,35,36,37,38,39,40,46];
function limit(event) {
  var self = $(this),
      maxlength = self.attr('maxlength'),
      len = self.val().length;
  if (maxlength && maxlength > 0 && len > maxlength) {
    self.val(self.val().substr(0, maxlength));
  }
}
jQuery(function($) {
  $('textarea[maxlength]').live('keypress', function(event) {
    var self = $(this),
        maxlength = self.attr('maxlength'),
        code = $.data(this, 'keycode');
    if (maxlength && maxlength > 0) {
      return ( self.val().length < maxlength
               || $.inArray(code, ignore) !== -1 );
    }
  })
  .live('keydown', function(event) {
    $.data(this, 'keycode', event.keyCode || event.which);
  })
  .live('keyup', limit)
  .live('change', limit)
  .bind('paste', function(e) {  // Do not allow pasting anything over the length
    var self = $(this),
        maxlength = self.attr('maxlength');
    if (window.clipboardData && $(this).val().length + window.clipboardData.getData("Text").length > maxlength) {
      return false;
    }
    return true;
  });
});