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(function($){
$.fn.autoResize = function(options) {
var settings = $.extend({
onResize : function(){
},
animate : true,
animateDuration : 150,
animateCallback : function(){},
extraSpace : 20,
limit: 1000
}, options);
this.filter('textarea').each(function(){
// Get rid of scrollbars and disable WebKit resizing:
var textarea = $(this).css({resize:'none','overflow-y':'hidden'}),
origHeight = textarea.height(),
clone = (function(){
var props = ['height','width','lineHeight','textDecoration','letterSpacing'],
propOb = {};
$.each(props, function(i, prop){
propOb[prop] = textarea.css(prop);
});
return textarea.clone().removeAttr('id').removeAttr('name').css({
position: 'absolute',
top: 0,
left: -9999
}).css(propOb).attr('tabIndex','-1').insertBefore(textarea);
})(),
lastScrollTop = null,
updateSize = function() {
clone.height(0).val($(this).val()).scrollTop(10000);
var scrollTop = Math.max(clone.scrollTop(), origHeight) + settings.extraSpace,
toChange = $(this).add(clone);
if (lastScrollTop === scrollTop) { return; }
lastScrollTop = scrollTop;
if ( scrollTop >= settings.limit ) {
$(this).css('overflow-y','');
return;
}
settings.onResize.call(this);
settings.animate && textarea.css('display') === 'block' ?
toChange.stop().animate({height:scrollTop}, settings.animateDuration, settings.animateCallback)
: toChange.height(scrollTop);
};
textarea
.unbind('.dynSiz')
.bind('keyup.dynSiz', updateSize)
.bind('keydown.dynSiz', updateSize)
.bind('change.dynSiz', updateSize);
});
return this;
};
})(jQuery);
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