khanat-opennel-code/code/web/public_php/ams/js/jquery.autogrow-textarea.js

55 lines
2.1 KiB
JavaScript

(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: $self.css('lineHeight'),
resize: 'none'
}).appendTo(document.body);
var update = function()
{
var times = function(string, number)
{
for (var i=0, r=''; i<number; i++) r += string;
return r;
};
var val = self.value.replace(/</g, '&lt;')
.replace(/>/g, '&gt;')
.replace(/&/g, '&amp;')
.replace(/\n$/, '<br/>&nbsp;')
.replace(/\n/g, '<br/>')
.replace(/ {2,}/g, function(space){ return times('&nbsp;', 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);