platforma/static/js/jquery.elastic.js

   1 (function(jQuery){jQuery.fn.extend({elastic:function(){var mimics=['paddingTop','paddingRight','paddingBottom','paddingLeft','fontSize','lineHeight','fontFamily','width','fontWeight'];return this.each(function(){if(this.type!='textarea'){return false;}
   2 var $textarea=jQuery(this),$twin=jQuery('<div />').css({'position':'absolute','display':'none','word-wrap':'break-word'}),lineHeight=parseInt($textarea.css('line-height'),10)||parseInt($textarea.css('font-size'),'10'),minheight=parseInt($textarea.css('height'),10)||lineHeight*3,maxheight=parseInt($textarea.css('max-height'),10)||Number.MAX_VALUE,goalheight=0,i=0;if(maxheight<0){maxheight=Number.MAX_VALUE;}
   3 $twin.appendTo($textarea.parent());var i=mimics.length;while(i--){$twin.css(mimics[i].toString(),$textarea.css(mimics[i].toString()));}
   4 function setHeightAndOverflow(height,overflow){curratedHeight=Math.floor(parseInt(height,10));if($textarea.height()!=curratedHeight){$textarea.css({'height':curratedHeight+'px','overflow':overflow});}}
   5 function update(){var textareaContent=$textarea.val().replace(/&/g,'&amp;').replace(/  /g,'&nbsp;').replace(/<|>/g,'&gt;').replace(/\n/g,'<br />');var twinContent=$twin.html();if(textareaContent+'&nbsp;'!=twinContent){$twin.html(textareaContent+'&nbsp;');if(Math.abs($twin.height()+lineHeight-$textarea.height())>3){var goalheight=$twin.height()+lineHeight;if(goalheight>=maxheight){setHeightAndOverflow(maxheight,'auto');}else if(goalheight<=minheight){setHeightAndOverflow(minheight,'hidden');}else{setHeightAndOverflow(goalheight,'hidden');}}}}
   6 $textarea.css({'overflow':'hidden'});$textarea.keyup(function(){update();});$textarea.live('input paste',function(e){setTimeout(update,250);});update();});}});})(jQuery);