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