(function($){$.fn.expandingTextArea=function(){return this.filter("textarea").each(function(){var textarea=this;var $this=$(this);$this.css({"overflow-x":"auto","overflow-y":"hidden","box-sizing":"border-box","-moz-box-sizing":"border-box","-webkit-box-sizing":"border-box",resize:"none"});var _busyResizing=false;var _needsHelpShrinking=$.browser.mozilla||$.browser.webkit;var _setTimoutHandle;var gcs;if($.browser.webkit){gcs=function(node){var s;if(node.nodeType==1){var dv=node.ownerDocument.defaultView;s=dv.getComputedStyle(node,null);if(!s&&node.style){node.style.display="";s=dv.getComputedStyle(node,null)}}return s||{}}}else{if($.browser.msie){gcs=function(node){return node.nodeType==1?node.currentStyle:{}}}else{gcs=function(node){return node.nodeType==1?node.ownerDocument.defaultView.getComputedStyle(node,null):{}}}}var px;if(!$.browser.msie){px=function(element,value){return parseFloat(value)||0}}else{px=function(element,avalue){if(!avalue){return 0}if(avalue=="medium"){return 4}if(avalue.slice&&avalue.slice(-2)=="px"){return parseFloat(avalue)}with(element){var sLeft=style.left;var rsLeft=runtimeStyle.left;runtimeStyle.left=currentStyle.left;try{style.left=avalue;avalue=style.pixelLeft}catch(e){avalue=0}style.left=sLeft;runtimeStyle.left=rsLeft}return avalue}}function _getHeight(){var newH=textarea.scrollHeight;if($.browser.msie){newH+=textarea.offsetHeight-textarea.clientHeight}else{if($.browser.webkit){newH+=getBorderExtents(textarea).h}else{if($.browser.mozilla){newH+=textarea.offsetHeight-textarea.clientHeight}else{newH+=getPadBorderExtents(textarea).h}}}return newH}function getPadExtents(n,computedStyle){var s=computedStyle||gcs(n),l=px(n,s.paddingLeft),t=px(n,s.paddingTop);return{l:l,t:t,w:l+px(n,s.paddingRight),h:t+px(n,s.paddingBottom)}}function getBorderExtents(n,computedStyle){var ne="none",s=computedStyle||gcs(n),bl=(s.borderLeftStyle!=ne?px(n,s.borderLeftWidth):0),bt=(s.borderTopStyle!=ne?px(n,s.borderTopWidth):0);return{l:bl,t:bt,w:bl+(s.borderRightStyle!=ne?px(n,s.borderRightWidth):0),h:bt+(s.borderBottomStyle!=ne?px(n,s.borderBottomWidth):0)}}function getPadBorderExtents(n,computedStyle){var s=computedStyle||gcs(n),p=getPadExtents(n,s),b=getBorderExtents(n,s);return{l:p.l+b.l,t:p.t+b.t,w:p.w+b.w,h:p.h+b.h}}function _shrink(){_setTimoutHandle=null;if(_needsHelpShrinking&&!_busyResizing){_busyResizing=true;var empty=false;if(textarea.value==""){textarea.value=" ";empty=true}var scrollHeight=textarea.scrollHeight;if(!scrollHeight){_estimateHeight()}else{var oldPadding=$this.css("padding-bottom");var newPadding=getPadExtents(textarea);newPadding=newPadding.h-newPadding.t;$this.css("padding-bottom",newPadding+1+"px");var newH=_getHeight()-1+"px";if($this.css("max-height")!=newH){$this.css("padding-bottom",newPadding+scrollHeight+"px");textarea.scrollTop=0;$this.css("max-height",_getHeight()-scrollHeight+"px")}$this.css("padding-bottom",oldPadding)}if(empty){textarea.value=""}_busyResizing=false}}function _estimateHeight(){$this.css({"max-height":"",height:"auto"});textarea.rows=(textarea.value.match(/\n/g)||[]).length+1}function _onInput(){if(_busyResizing){return}_busyResizing=true;if(textarea.scrollHeight&&textarea.offsetHeight&&textarea.clientHeight){var newH=_getHeight()+"px";if($this.css("height")!=newH){$this.css("height",newH);$this.css("maxHeight",newH)}if(_needsHelpShrinking){if(_setTimoutHandle){clearTimeout(_setTimoutHandle)}_setTimoutHandle=setTimeout(_shrink,0)}}else{_estimateHeight()}_busyResizing=false}_setTimoutHandle=setTimeout(_onInput,0);$this.unbind(".expandingTextarea").bind("keyup.expandingTextarea",_onInput).bind("keydown.expandingTextarea",_onInput).bind("change.expandingTextarea",_onInput).bind("scroll.expandingTextarea",_onInput).bind("resize.expandingTextarea",_onInput).bind("focus.expandingTextarea",_onInput).bind("blur.expandingTextarea",_onInput).bind("cut.expandingTextarea",_onInput).bind("paste.expandingTextarea",_onInput)})}})(jQuery);