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(function($) { /** * Auto-growing textareas; technique ripped from Facebook * * http://github.com/jaz303/jquery-grab-bag/tree/master/javascripts/jquery.autogrow-textarea.js */ $.fn.autogrow = function(options) { return this.filter('textarea').each(function() { var self = this; var $self = $(self); var minHeight = $self.height(); var noFlickerPad = $self.hasClass('autogrow-short') ? 0 : parseInt($self.css('lineHeight')); var shadow = $('<div></div>').css({ position: 'absolute', top: -10000, left: -10000, width: $self.width(), fontSize: $self.css('fontSize'), fontFamily: $self.css('fontFamily'), fontWeight: $self.css('fontWeight'), lineHeight: $self.css('lineHeight'), resize: 'none' }).appendTo(document.body); var update = function() { var times = function(string, number) { for (var i=0, r=''; i<number; i++) r += string; return r; }; var val = self.value.replace(/</g, '<') .replace(/>/g, '>') .replace(/&/g, '&') .replace(/\n$/, '<br/> ') .replace(/\n/g, '<br/>') .replace(/ {2,}/g, function(space){ return times(' ', space.length - 1) + ' ' }); shadow.css('width', $self.width()); shadow.html(val); $self.css('height', Math.max(shadow.height() + noFlickerPad, minHeight)); } $self.change(update).keyup(update).keydown(update); $(window).resize(update); update(); }); }; })(jQuery);